Regional Partners Launch Landmark Study to Secure Backup Water Supply for the National Capital Region

Th following is from a WSSC press release: 

$25 million Secure the Source study will evaluate large-scale regional solutions to provide several weeks of emergency drinking water backup for more than 5 million people who rely on the Potomac River.

Regional water utility leaders from WSSC Water, Fairfax Water, and the U.S. Army Corps of Engineers, along with government partners, announced the launch of Secure the Source, a $25 million regional study to evaluate large-scale backup water supply alternatives for the Potomac River.

The National Capital Region is almost entirely dependent on the Potomac River for its drinking water. That reliance leaves the entire capital region vulnerable to disruptions caused by intentional sabotage, accidental spills or contamination, prolonged drought, infrastructure failure, natural disasters, climate variability, and other emerging risks.

The study will identify large-scale solutions capable of providing several weeks of emergency backup drinking water for more than 5 million customers across Maryland, Virginia, and Washington, D.C. The initiative follows approval by the Assistant Secretary of the Army for Civil Works to begin the landmark study, which will include 35 percent design work and associated environmental impact assessments.

Why the Study Matters

“The Potomac River has served this region exceptionally well for generations,” said WSSC Water General Manager and CEO Kishia L. Powell. “However, planning for the future means recognizing that a single source of supply, no matter how reliable, carries inherent risks. This study will help identify a large-scale solution that strengthens the region’s resilience and helps ensure uninterrupted water service during an emergency.”

Study Scope and Alternatives

Conducted in partnership with regional water providers, state and local governments, federal agencies, and other stakeholders, Secure the Source will identify a backup water supply that can reduce the impact of extended disruptions to the Potomac River system.

The study will evaluate pre-screened large-scale regional alternatives developed by the U.S. Army Corps of Engineers Baltimore District, including:

• No action
• Travilah Quarry (MD)
• Blue Plains Advanced Wastewater Treatment Plant - Advanced Water Reuse (D.C.)
• Luck Stone Quarries B&C (VA)

 “The Secure the Source study represents a critical, collaborative step toward protecting more than 5 million people who depend on this shared resource,” said Jamie Hedges, General Manager/CEO of Fairfax Water. “By working together now, we can strengthen our regional resilience and ensure that safe, dependable drinking water is always there when our customers need it most.”

 “Ensuring a safe, reliable, and uninterrupted water supply to the National Capital Region is the core of the Washington Aqueduct's mission,” said Rudy Chow, General Manager of the Washington Aqueduct. “While our current systems are resilient, a secondary water source is an urgent necessity to provide the critical operational redundancy required to safeguard our nation's capital against future disruptions. The U.S. Army Corps of Engineers, Baltimore District, is pleased to provide technical assistance to this regional effort as our utility partners spearhead vital long-term water security solutions.”

 “This effort is exactly the kind of decisive action that Maryland and the nation’s capital region need to secure the water supply at a time of growing stresses and threats,” said Serena McIlwain, Secretary of the Maryland Department of the Environment. “A sustainable, reliable water supply is essential to sustain life and grow our economy, and this feasibility study is a pivotal step to secure that water supply for generations to come.”

 “Water is the foundation of public health, economic vitality and national security,” said Michael Nardolilli, Executive Director of the Interstate Commission on the Potomac River Basin. “This study is about ensuring that future generations inherit a water system that is resilient, reliable and prepared for the challenges ahead.”

More than 5 million residents, visitors, businesses, federal agencies, military installations, and institutions throughout the Washington metropolitan region depend on uninterrupted access to safe drinking water from the Potomac River. Utility leaders are expediting the pursuit of a large-scale solution that would provide several weeks of backup drinking water storage capacity for the entire metro region.

“This effort reflects what our region does best — working together across jurisdictions and utilities to plan for our shared future,” said Clark Mercer, Executive Director of COG. “Building on proven regional investments like Jennings Randolph Reservoir and Blue Plains, we have a once-in-a-generation opportunity to strengthen our water supply and support the region for decades to come.”

 The effort builds on decades of regional collaboration and prior investments designed to enhance drought resilience and water supply reliability. The study's findings will provide decision-makers with the technical, environmental, and engineering information needed to determine the most viable path forward for long-term water security.

 “Good governance means planning ahead and preparing for challenges before they become crises,” said Montgomery County Executive Marc Elrich. “More than five million residents depend on the water supply from the Potomac River every day. This study is an important step toward ensuring that we have the infrastructure and resiliency needed to protect public health and maintain critical services during emergencies. I appreciate the leadership of WSSC Water, Fairfax Water, the U.S. Army Corps of Engineers, and our regional partners for working together on this critical issue.”

 Despite decades of planning and investment, the National Capital Region remains vulnerable because it is almost entirely reliant on the Potomac River for its water supply.  “Past investments have strengthened our water future, but today’s planning alone cannot meet tomorrow’s challenges,” said Prince George’s County Executive Aisha N. Braveboy. “Completing this study is essential to identify the infrastructure needed to protect Prince George’s County and the region for decades to come.”

 The Interstate Commission on the Potomac River Basin estimates that a prolonged, one-month disruption to the Capital Region’s water source could result in up to $15 billion in lost gross regional product and hundreds of millions of dollars in lost tax revenue.

The National Capital Region is home to the nation's capital, major military installations, federal agencies, international organizations, and one of the country's most dynamic economic centers. Regional leaders emphasized that reliable access to drinking water is essential not only for residents and businesses, but also for the continuity of critical government and military operations.

 Upon completion in two years, the study is expected to position the region to pursue future federal, state, and local investments needed to design and construct the recommended alternative. A large-scale regional water security project will require significant investment, and regional partners will need to work together to secure funding for construction of the selected alternative.

 Current U.S. Army Corps of Engineers Study

The region previously pursued and received congressional authorization and funding for a study to analyze options for a secondary source of drinking water, led by the U.S. Army Corps of Engineers. USACE now follows a framework under which studies must be completed within three years and cost $3 million or less. As a result, the scope of that study was reduced to assessing upgrades at the Dalecarlia Reservoir that would provide approximately 12 additional hours of water reserve for the Washington Aqueduct exclusively. While those upgrades would provide some increased resilience, regional water utilities recognize the need for larger-scale regional solutions that can provide several weeks of storage capacity, ensure customers throughout the region have access to clean, safe drinking water during a crisis, and put the region on par with the drinking water resilience of other major metropolitan areas in the United States.

About WSSC Water

Established in 1918, WSSC Water is the largest utility in Maryland and the eighth-largest water and wastewater utility in the nation. It provides safe, reliable drinking water and wastewater services to 1.9 million residents in Prince George’s and Montgomery counties through approximately 475,000 customer accounts across a nearly 1,000-square-mile service area. WSSC Water operates and maintains more than 11,000 miles of drinking water and sewer mains. In more than a century of service, WSSC Water has never had a drinking water quality violation.

 As a not-for-profit public utility, WSSC Water is focused on serving customers, not shareholders. Every dollar collected is reinvested directly into infrastructure, technology, and its workforce to strengthen reliability, improve service, and protect public health for generations to come.

About Fairfax Water

Chartered in 1957 by the Virginia State Corporation Commission as a public, not-for-profit water utility, Fairfax Water is governed by a 10-member Board of Directors composed of Fairfax County citizens and appointed by the elected Fairfax County Board of Supervisors. A General Manager, supported by more than 514 water professionals, manages the day-to-day operations of Fairfax Water. Fairfax Water is Virginia’s largest water utility and one of the 25 largest water utilities in the country, serving one out of every four Virginians who obtain their water from public utilities. More than 2.2 million people in Northern Virginia communities including Fairfax County, Loudoun County, Prince William County, Herndon, Vienna, Alexandria, Falls Church, Fairfax City, Fort Belvoir, and Dulles International Airport depend on Fairfax Water for reliable drinking water.

 Fairfax Water draws raw water from two primary sources: the Potomac River and the Occoquan Reservoir, which is fed by the Occoquan River, a tributary of the Potomac. Fairfax Water owns and operates two of the largest water treatment facilities in Virginia, with average daily water production of 170 million gallons and combined maximum production capacity of 345 million gallons per day.

About the Washington Aqueduct

The Washington Aqueduct, a division of the U.S. Army Corps of Engineers, Baltimore District, is a federally owned and operated public water supply agency that has served the National Capital Region since 1859. Operating two D.C.-based water treatment plants, the Aqueduct produces an average of 135 million gallons of safe drinking water daily for approximately one million regional users. The agency provides a dependable supply to three wholesale customers: DC Water, Arlington County, and Fairfax Water. Grounded in a rich engineering heritage, this vital federal asset integrates a unified security posture with modern processes to support national security and long-term regional water resilience.

 About ICPRB

The mission of the Interstate Commission on the Potomac River Basin is to protect and enhance the waters and related resources of the Potomac River basin through science, regional cooperation, and education. Through regional cooperation and partnerships, ICPRB protects the river and improves quality of life in the watershed.

 ICPRB monitors river levels and coordinates releases from upstream drinking water reservoirs to supplement flow.

 About COG

Founded in 1957, COG is a nonprofit association with a membership of 300 elected officials from 24 local governments, the Maryland and Virginia state legislatures, and the U.S. Congress. Every month, more than 1,500 officials and experts connect through COG to develop solutions to the region’s major challenges and plan for the future. The Board of Directors is COG’s governing body and is responsible for its overall policies. A wide network of city and county managers, police and fire chiefs, housing and planning directors, environmental officials, chief equity officers, public health officials, transportation planners, and others coordinate through COG’s committees, partnerships, and working groups.

Are Water Restrictions Coming for You?

Last Friday, the Fauquier County Water and Sanitation Authority (FCWSA) implemented mandatory water restriction rules, due to the active Drought Warning Advisory issued by the Virginia Department of Environmental Quality.

The mandatory rules target outdoor water consumption for all customers on the public FCWSA water systems to preserve water pressure and fire protection services. Residents relying on private wells are strongly encouraged to voluntarily practice the same conservation measures.

The mandatory restrictions ban or strictly limit the following activities:

• Lawn Watering: The use of sprinklers or irrigation systems is prohibited.
• Vehicle Washing: Washing cars, trucks, or trailers at home is banned, except at dedicated commercial facilities that use water recycling systems.
• Pool Filling: Filling empty swimming pools or wading pools (or those less than three-quarters full) is prohibited.
• Surface Cleaning: Washing down driveways, sidewalks, parking lots, or exterior building structures is barred unless required for health or safety.
• Decorative Elements: Operating non-essential water amenities like fountains, waterfalls, or reflecting ponds is banned unless required to sustain aquatic life.

Caroline County has also issued mandatory water restrictions. Due to extreme drought conditions straining their groundwater supply, county officials elevated local emergency rules to Level 3 Mandatory Restrictions.

The broader D.C. metropolitan area remains under a regional Drought Watch, meaning that local jurisdictions rely entirely on voluntary cutbacks to protect the Potomac River basin. If you recall at the beginning of June, the Metropolitan Washington Council of Governments (COG) put a Drought Watch into effect due to the unusually dry conditions that are expected to persist despite recent rainfall. The regional Drought Watch applies to nearly six million residents across the District of Columbia, suburban Maryland, and Northern Virginia the water saving measures requested are voluntary.

Fairfax Water & Fairfax City

Fairfax Water emphasizes optimizing daily household routines to keep backup reservoirs full:

·         Indoor: Shorten showers to under 5 minutes, turn off faucets while brushing teeth or shaving, and fix plumbing leaks immediately (especially running toilets).

• Appliances: Only run dishwashers and laundry machines when fully loaded.
• Outdoor: Minimize the watering of lawns or shrubs, use a broom instead of a hose to clear driveways, and avoid home car washing. Loudoun Water & Town of Leesburg

Loudoun Water and the Town of Leesburg ask residents to fundamentally shift outdoor water usage to slow down the drought's impact:

• Lawn Care: Suspend or heavily restrict routine lawn irrigation; let established grass go dormant in the dry weather.
• Targeted Watering: Prioritize root systems of newly planted trees or essential shrubs using a slow drip to prevent runoff.
• Vehicle Washing: Skip home vehicle or boat washing entirely, or substitute with commercial recycling car washes.

Prince William Water

Prince William Water focuses heavily on strict monitoring of outdoor demands while supply in the Potomac remains adequate:

• Landscaping: Actively monitor and decrease the frequency of plant and shrub watering.
• Hardscape Cleaning: Heavily discourage hosing down patios, sidewalks, and siding, requesting sweeping instead.
• Kitchen Habits: Run the faucet only when actively scrubbing dishes if washing by hand.

Town of Purcellville

Because the Town of Purcellville operates on an independent groundwater/well network, they remain at a localized Drought Warning level despite lifting mandatory restrictions. They request the most aggressive voluntary pullbacks in the area:

• Strict Conservation: Voluntarily cease all non-essential outdoor water usage.
• Peak Shaving: Minimize any essential appliance use during peak early morning and late evening hours to protect community system pressure

DC Water Voluntary Guidelines

The utility urges consumers to practice "wise water use" through minor adjustments to daily household routines:

• Shorter Showers: Keep daily showers under 5 minutes.
• Faucet Habits: Turn off the tap while brushing teeth, shaving, or scrubbing dishes by hand.
• Smart Outdoor Watering: Limit unnecessary watering, and only water yards during the early morning or evening to minimize evaporation.
• Full Laundry/Dish Loads: Delay running appliances until they are completely full.
• Proactive Leak Checks: Inspect toilets, faucets, and exterior hoses for hidden leaks and patch them immediately

WSSC Water Voluntary Restrictions (Current)

WSSC Water has adopted the regional "Wise Water Use" guidelines under the current Drought Watch. They ask customers to:

• Outdoor:

o    Limit lawn watering and stop if it rains.

o    Use a broom, not a hose, to clean driveways, sidewalks, and patios.

o    Use commercial car washes that recycle water instead of washing vehicles at home.

o    Water flowers and shrubs with a hand-held hose or watering can rather than automated sprinklers.

• Indoor:

o    Keep showers to under 5 minutes.

o    Turn off faucets while brushing teeth or shaving.

o    Only run dishwashers and washing machines with full loads.

o    Check for and repair silent leaks, especially in toilets (a major source of wasted water).

 Because WSSC, Fairfax Water, Prince William Water, Loudoun Water, and the Town of Leesburg all share the Potomac River as their primary water source, they coordinate their restriction levels together through the Metropolitan Washington Council of Governments. They will move to mandatory restrictions only when the region escalates to a Drought Emergency. The trigger for a drought emergency is: Critical water shortage where backup reservoirs are dangerously low and there is an imminent risk of not meeting essential public health and safety needs (fire protection, drinking water).

EPA Proposed Changes to PFAS Drinking Water Rules

EPA Proposed Changes to PFAS Drinking Water Rules

In a May 18, 2026 press release, the U.S. Environmental Protection Agency (EPA) announced a proposed rule that would rescind the 2024 drinking water standards for PFHxS, PFNA, HFPO-DA (GenX chemicals), PFBS, and the hazard index for mixtures involving these PFAS.

• Written comments on the proposed rule are due by July 20, 2026.
• The public docket is available at www.regulations.gov under Docket ID: EPA-HQ-OW-2025-0654.
• The EPA will hold a virtual public hearing on July 7, 2026 to present information on the proposal and receive verbal comments.
• Registration is required to attend or speak, and the deadline to pre-register to provide public comment is July 1, 2026.
• Information and registration for the hearing are available here.
• The EPA will post the hearing agenda and list of pre-registered speakers by July 6, 2026.
• Questions about the hearing may be directed to PFASNPDWR@epa.gov.

The EPA is also proposing to extend the compliance deadlines for the PFOA and PFOS maximum contaminant levels (MCLs). The hearing on that proposal will be held sequentially with the PFAS rescission hearing.

In practical terms, the EPA is not simply revisiting these rules; it is proposing to revoke the existing 2024 enforceable limits for GenX, PFNA, PFBS, and PFHxS and begin a new review process that could take years. If finalized, those chemicals would return to an unregulated federal status during that period. At the same time, the compliance deadlines for PFOA and PFOS would be extended by two years.

Virginia's Response

Because Virginia public water systems must ultimately align with federal Safe Drinking Water Act standards, the Commonwealth is focusing on upstream sources of PFAS contamination. The Virginia Department of Environmental Quality (DEQ) is leading several initiatives under state legislation signed by Governor Spanberger on April 26, 2026.

• When the Virginia Department of Health (VDH) identifies a public water system that exceeds a PFAS threshold, DEQ must trace the contamination back to its source.
• DEQ may require suspected industrial facilities and manufacturers to self-report or monitor PFAS discharges for one year.
• Publicly owned wastewater treatment plants, airports, firefighting facilities, and industrial chemical users must test their effluent and discharges for PFAS and report the results to DEQ.

Related Virginia laws also expressly allow localities to require PFAS testing of sewage sludge, or biosolids, before those materials are applied to farmland as fertilizer. This matters because land application is one pathway by which PFAS can enter the food supply. Wastewater treatment plants do not destroy PFAS; instead, they concentrate these chemicals in solid residuals. When a municipal plant receives waste from sources such as chemical manufacturers, carpet producers, or facilities that used aqueous film-forming foam (AFFF), the resulting biosolids can contain elevated PFAS concentrations.

When biosolids with elevated PFAS are spread on fields, short-chain PFAS compounds can be taken up by crops such as corn and grains. Livestock that consume those crops or graze on sludge-amended pasture can then accumulate PFAS in their milk, fat, and organs. In several states—including Maine, Michigan, and Texas—this contamination has contributed to severe agricultural losses, including farm closures and the culling of herds.

COG Declares a Regional Drought Watch

The following is a news release from the Metropolitan Washington Council of Governments"

 Washington, DC (June 3, 2026) – A Drought Watch was put into effect today by the Drought Coordination Committee of the Metropolitan Washington Council of Governments (COG) following unusually dry conditions that are expected to persist despite recent rainfall. The regional Drought Watch applies to nearly six million residents across the District of Columbia, suburban Maryland, and Northern Virginia.

Officials stress that while there is currently an adequate supply of water in the Potomac River and backup reservoirs, residents and businesses are encouraged to practice wise water use by taking simple, voluntary steps to reduce water use and help protect the region’s water resources if dry conditions persist.

 

Here are some simple tips residents can use to limit indoor and outdoor water use:

 

INDOOR

• Reduce shower length to under 5 minutes;
• Turn off water while brushing your teeth/shaving;
• Wash only full loads of dishes and clothes; and
• Fix any plumbing leaks – especially toilets and faucets.

OUTDOOR

• Monitor watering lawns, plants, and shrubs;
• Sweep sidewalks and driveways (instead of using a hose); and
• Avoid washing your car or instead use a commercial car wash that recycles water.

The region’s last Drought Watch occurred between July 2024 to June 2025. This year, from March to April, the region experienced record-breaking high temperatures along with some periods of historically low streamflow levels. The Potomac River reached its lowest level during this time period, based on 130 years of data. In addition, the two-year precipitation deficit is almost 8 inches.

 

“Our region hasn’t seen extremely dry conditions like this in about two decades when local leaders and COG first established a drought response plan to support coordination and communication regionwide,” said Clark Mercer, COG Executive Director. “During the Drought Watch, we’re asking the public to help by incorporating simple, water-saving actions into their daily routines.”

 

A Drought Watch is an early advisory stage in the Regional Drought Response Plan. It is the level before the Drought Warning stage, when water restrictions would be encouraged. At the highest Emergency stage, jurisdictions and utilities may implement mandatory water use restrictions in a coordinated manner. Since the adoption of the regional drought plan in 2000, the region has not entered the Drought Warning stage.

“Due to years of planning and preparation, our water supply infrastructure is well-equipped to handle drought. Nevertheless, it makes sense for all of us to use water wisely to conserve this precious resource,” stated Michael Nardolilli, the executive director of the Interstate Commission on the Potomac River Basin (ICPRB). The ICPRB is monitoring the Potomac River flow daily and working with several federal agencies, regional partners, and area water suppliers to assess the situation in real time. The Potomac River supplies 78 percent of the drinking water for the region.

 

“We’re working closely with our regional partners to actively monitor conditions and protect our shared water resources,” said WSSC Water General Manager and CEO Kishia L. Powell. “While our water supply remains stable, now is a great time for all of us to practice wise water use. By making simple, voluntary changes in daily routines, our customers can save water and money.”

 

“The Washington Aqueduct stands fully ready and prepared to meet the operational demands of our region during these drought conditions,” said Washington Aqueduct General Manager Rudy Chow. “However, managing our shared water resources is a collective responsibility. We rely on the community’s awareness and voluntary actions to ensure long-term water resiliency for everyone.”

 

“While our region has an adequate water supply to meet demands, the public can make a difference during these dry spells by using water wisely,” said Fairfax Water General Manager Jamie Bain Hedges.

 

JURISDICTIONS IN THE COG DROUGHT WATCH:

 

District of Columbia

 

Suburban Maryland

Town of Bladensburg; City of Bowie; City of College Park; Charles County; City of Frederick; Frederick County; City of Gaithersburg; City of Greenbelt; City of Hyattsville; City of Laurel; Montgomery County; Prince George's County; City of Rockville; City of Takoma Park

 

Northern Virginia

City of Alexandria; Arlington County; City of Fairfax; Fairfax County; City of Falls Church; Loudoun County; City of Manassas; City of Manassas Park; Prince William County

The Impact of Development on Source Water and Groundwater Recharge

The water flowing from our taps doesn't originate at a treatment plant; it begins in our watersheds, specifically the upstream land of the greater Occoquan Watershed. When development occurs—such as paving and building within the watershed—we do more than alter the scenery. These actions fundamentally change how water moves through the landscape, how streams withstand drought, and how much pollution ultimately reaches the reservoir.

Development and Its Consequences

Every acre of forest and field that is converted into roofs, roads, and driveways reduces groundwater recharge and increases polluted runoff. This pushes our streams closer to drying up, causing gradual, cumulative, and eventually sudden destruction of our source water.

Currently, there is a proposal to amend the Comprehensive Plan for more than 200 acres west of Thoroughfare Road and south of John Marshall Highway. This proposal would change zoning from A-1 Agricultural to Planned Mixed Residential (PMR), permitting 97 detached homes, 56 attached homes, and the accompanying roads, parking lots, driveways, patios, and other impervious surfaces. Such changes are not neutral for the water supply; they directly impact the land that feeds our streams and, ultimately, the Occoquan Reservoir. It is not just this change it is the destruction of the watershed one comprehensive plan amendment at a time. 

Importance of the Bull Run Watershed

The Bull Run watershed is a vital part of the source-water system for the Occoquan Reservoir, which supplies drinking water to eastern Prince William County and much of eastern Fairfax County. The lower Bull Run area remains one of the most intact and least-disturbed sections of the watershed. Once these headwaters are fragmented and paved, we lose the natural infrastructure that maintains clean water, particularly during droughts. The issues observed in Little Bull Run are not isolated; they serve as a warning regarding the consequences of continued development in western and central Prince William for our drinking water supply.

Groundwater: The Invisible Essential

To understand the ongoing changes, it's important to discuss groundwater, which is invisible yet essential. Groundwater typically provides 30% to more than 50% of the annual flow for streams and rivers. This steady, slow-moving contribution is known as baseflow and acts like a "savings account," sustaining streams over time and providing flow during dry spells.

Drought and Its Effects

Prince William County and most of Virginia are currently experiencing severe drought. While the region usually receives about 44 inches of rainfall annually, last year was about 9 inches below average, and the first half of this water year saw roughly half the usual precipitation- about 13 inches below average. Despite a period of very wet years from 2018 to 2021, followed by near-normal rainfall with dry summers, recent summers have exposed weaknesses in the system.

Stream and Groundwater Dynamics

Streams in the Bull Run watershed are “gaining” streams, receiving direct groundwater supply. For groundwater to feed a stream, the water table must be higher than the stream’s water level, allowing water to seep through streambeds and banks. Excessive groundwater withdrawal or reduced recharge can sever this connection, turning perennial streams into seasonal ones.

Impervious Cover and Stormwater Runoff

As development increases impervious cover—such as roads, pavement, and buildings—the area available for rain and snow to infiltrate the ground decreases. Stormwater velocity and quantity rise, preventing infiltration and increasing flooding, which carries fertilizers, oil, grease, and road salt into rivers and streams. In the past six years, stormwater flooding has occurred adjacent to previously open areas of the county away from the shoreline.

Increased runoff volume and velocity lead to higher peak storm flows, causing flooding, soil erosion, and fast-moving water that carries contaminants. Reduced infiltration means less groundwater, which is essential for maintaining the base flow to streams and rivers feeding the Occoquan Reservoir during dry months.

Groundwater Recharge Trends

Groundwater in the Culpeper Basin is generally replenished annually through precipitation, but increasing impervious surfaces have altered this balance. In the past, water withdrawal matched recharge rates, ensuring adequate supply even during droughts. However, the region’s only nearby US Geological Survey groundwater monitoring well has shown a slow decline in water levels over the past decade and a half, despite varied rainfall conditions.

Watershed Response to Development

In Haymarket, the Bull Run Mountain Conservancy found that perennial streams such as Little Bull Run and Catlett’s Branch were dry during a dry August, with Catharpin Creek reduced to puddles. This was the driest period observed and may signal a new normal during dry times, highlighting how the watershed responds to recent development.

Reduced groundwater levels gradually transform perennial streams into ephemeral ones, disconnecting groundwater from surface water. Once development destroys watershed hydrology, restoration becomes extremely difficult. The Occoquan watershed is essential for regional drinking water, and groundwater is critical for streams and rivers.

Protecting Groundwater and Hydrology

Long-Term Watershed Changes

Development triggers immediate responses in a watershed, but significant ecological and physical changes take 20 to 50 years to fully emerge. Replacing 35–50% of forested areas with impervious surfaces permanently alters water movement. As impervious coverage increases, profound hydrological and ecological shifts occur over time.

Hydrological Alterations

• Runoff reaches streams more rapidly and in larger volumes, causing higher peak floods and more frequent flooding.
• Perennial streams begin to dry out or flow intermittently, eventually becoming ephemeral.
• Impervious surfaces prevent water from soaking into the ground, leading to dropping water tables and dry streams during summer.

Physical and Water Quality Changes

• High-velocity storm runoff causes severe bank erosion, incision, and blowouts, destroying aquatic habitats.
• Stormwater carries oils, heavy metals, road salts, and nutrients directly into waterways, bypassing natural filtration.
• Rainwater flowing over heated pavement raises stream temperatures, threatening aquatic life.
• Pavement, compacted lawns, and buildings prevent groundwater percolation, increasing land temperatures.

The cumulative effects observed now stem from building during the 1990s through 2007.

Recommendations for Protecting Source Water

• Treat the Bull Run watershed as source-water infrastructure—not as leftover land for development.
• Oppose Comprehensive Plan changes and rezonings that increase impervious cover in headwaters feeding Bull Run and the Occoquan system.
• Enforce stronger safeguards: limits on impervious cover, meaningful forest protection, groundwater-recharge preservation, and stormwater designs that mimic natural infiltration.
• Support acquisition and conservation easements for large, connected tracts in the watershed, because once developed, hydrology is permanently changed.

If the watershed continues to be treated as an empty canvas for growth, we risk actively destroying the source water for our regional drinking water supply, incrementally through rezoning, roads, and parking lots. By protecting infiltration, baseflow, and intact stream corridors now, we can safeguard the Occoquan for decades to come.

The time has come to Regulate Chemical AST's

 As of late Tuesday night, May 26, 2026, the emergency at the GKN Aerospace facility in Garden Grove has been resolved, and all evacuation orders have been lifted. According to news reports, The threat of a catastrophic explosion has been completely ruled out. A structural crack that naturally formed in the upper portion of the tank over the weekend served as a crucial fail-safe, safely venting the excessive internal pressure and naturally cooling the internal chemical. This was the best outcome of the situation.

The crisis in Orange County, California, began involving a 34,000-gallon aboveground storage tank (AST) holding highly volatile methyl methacrylate (MMA) at the GKN Aerospace facility in Garden Grove.  

An overnight internal temperature spike caused the tank to over-pressurize and off-gas vapors. Emergency mitigation completely stalled because the tank's drainage and mechanical valves were not working and "gummed up," preventing responders from pumping out the chemical or injecting neutralizing stabilizers. Having started my environmental career in 1978 helping to create RCRA this makes me insane. The area was evacuated for days. And to try and lower the tank temperature, emergency crews used unmanned high-volume water cannons (which were dousing the tank with over 1,200 gallons of water per minute). Trying to stabilize the tank’s temperature.

History of the Tank and Facility

While GKN Aerospace has operated the facility on Western Avenue since 2004, the chemical storage tanks on-site have been present since at least 1972, meaning parts of the physical infrastructure are over 50 years old.

The facility uses MMA to manufacture specialized, high-performance acrylic windscreens for military fighter jets. MMA is highly reactive and prone to dangerous exothermic (heat-generating) polymerizing reactions if not carefully stored and kept below 77 degrees Fahrenheit.

Inspection and Violation History

California officials have openly attributed this crisis to a systemic failure of safety redundancies and poor equipment maintenance rather than simple age-related decay. The facility has a documented history of oversight failures. Reports on file indicate that the facility has incurred 10 OSHA violations, including a specific citation for failing to maintain manufacturing machinery according to the manufacturer’s instructions.

The operator, GKN Aerospace,  paid nearly $1 million to settle environmental violations, highlighting a pre-existing history of compliance issues regarding hazardous materials handling.

Aboveground Storage Tank (AST) Regulations in California

Above Ground Storage Tanks  (AST) are not properly regulated in the United States. California, with some of the strongest AST regulations maintains a bifurcated regulatory framework depending strictly on whether they hold petroleum or hazardous non-petroleum chemicals and only bothers with petroleum products.

California's Aboveground Petroleum Storage Act (APSA) strictly regulates facilities storing 1,320 gallons or more of petroleum products (such as diesel, gasoline, or crude oil). Because methyl methacrylate is an industrial solvent/monomer and not a petroleum product, it falls entirely outside of the regulation’s jurisdiction.

Industrial chemical ASTs are instead regulated under California's Hazardous Materials Release Response Plans and Inventory law. Facilities holding hazardous chemicals above threshold quantities (55 gallons for liquids) must submit Hazardous Material Business Plan to the local Certified Unified Program Agency (CUPA)—typically a county environmental health department or a large city fire department that locally enforces state environmental and emergency management laws. The primary purpose of an HMBP is to provide immediate, accurate information to first responders (like firefighters and hazmat teams) during an emergency, ensuring they know exactly what chemicals are inside a building before they enter.

Because MMA is highly reactive and flammable, facility infrastructure is bound by Cal/OSHA standards (Title 8, Section 5189). This legally mandates mechanical integrity programs, meaning the facility is required to routinely inspect, test, and maintain critical process components—including piping, relief valves, and cooling systems—to prevent catastrophic failures. Clearly, this did not happen appropriately for a tank that is believed to be over 50 years old.

Relying solely on general Hazardous Materials Business Plans allows chemical aboveground storage tanks (ASTs) to bypass some of the engineering and safety mandates applied to petroleum tanks. California and the rest of the nation needs Chemical AST Regulations.   Stealing profusely from the CA Aboveground Petroleum Storage Act, and with the help of AI to examine AST regulations across the land, this is what needs to be done in California and elsewhere:

1. Mandatory Secondary Containment

Every chemical AST must have a secondary containment system to isolate spills and prevent environmental contamination.

• Volumetric Capacity: Containment basins must hold 110% of the single largest tank's volume, plus additional capacity to hold a 25-year, 24-hour rainfall event for outdoor tanks.
• Material Impermeability: Liners and concrete basins must be chemically compatible with the stored substance. For reactive monomers like methyl methacrylate (MMA), containment must feature non-porous coatings to prevent absorption and chemical degradation.
• Separation Defenses: Impoundment areas must segregate incompatible chemicals. Acids, bases, and highly reactive monomers cannot share a drainage basin to avoid accidental mixing and violent exothermic reactions.

2. Risk-Based Lifespan and Age Limitations

Because physical infrastructure degrades over time, tanks must face stricter regulatory hurdles as they age.

• Design Life Cap: Implement a mandatory 50-year structural lifespan cap for high-risk chemical ASTs. Beyond 50 years, tanks must either undergo complete shell replacement or pass a rigorous, destructive metallurgical evaluation to clear them for 5-year extensions.
• Fitness-For-Service (FFS): After 20 years of service, operators must conduct an API 579 Fitness-For-Service assessment every 5 years to evaluate shell thinning, stress corrosion cracking, and structural fatigue.

3. Escalating Inspection Frequencies

Inspection intervals must automatically tighten as a tank ages, shifting from baseline tracking to aggressive preventative testing.

Tank Age	Internal Inspection Frequency	External Inspection Frequency	Mandatory Testing Scope
0 – 15 Years	Every 10 Years	Every 2 Years	Visual inspection, basic ultrasonic thickness (UT) spot checks.
16 – 30 Years	Every 5 Years	Annually	Full-floor UT scanning, weld seam magnetic particle testing.
31+ Years	Every 3 Years	Semi-annually	Advanced non-destructive testing (NDT), radiography of high-stress joints.

4. Critical Environment Controls (Cooling & Stabilization)

For volatile chemicals prone to runaway polymerization or thermal degradation, cooling systems must be regulated as essential and necessary safety systems.

• Redundant Cooling Loops: Facilities storing chemicals with critical runaway temperatures must utilize dual-independent cooling loops. If the primary refrigeration loop fails, a secondary, mechanically isolated backup loop must activate automatically.
• Emergency Inhibitor Injection: Tanks holding self-reacting monomers must feature an automated, gravity-fed inhibitor injection system. This system must be capable of flooding the tank with stabilizing chemicals within 15 minutes of a runaway heat spike, operating independently of municipal power or manual valves.
• Uninterruptible Power (UPS): Cooling systems, internal temperature probes, and pressure sensors must be hardwired to an on-site, fail-safe backup generator capable of running isolated for a minimum of 72 hours.

5. Vapor Space Management (Moisture & Oxygen Control)

Chemicals that react violently with ambient moisture or require specific oxygen levels to remain stable require active blanket gas regulation.

• Automated Nitrogen Blanketing: For water-reactive or highly flammable chemicals, a positive-pressure nitrogen (or inert gas) blanket system must be mandatory to displace oxygen and humidity.
• Controlled Oxygenation: Some chemicals, like MMA, actually require a precise, low level of dissolved oxygen (typically 20–50 ppm) to keep their stabilizing inhibitors active. Regulations must mandate continuous oxygen-sparging monitoring systems with automated alarms if oxygen levels dip below safe stabilization thresholds.
• Dual-Stage Desiccant Breathers: Any atmospheric venting lines must be equipped with redundant, color-indicating desiccant air breathers to strip 100% of moisture from incoming air during tank drawdown.

6. Valve and Piping Mechanical Integrity

To prevent responders from being locked out during a crisis, mechanical isolation points must be explicitly regulated.

• Quarterly Exercise Mandate: All critical emergency isolation, drainage, and dump valves must be mechanically cycled (exercised) every 90 days to ensure they do not seize or gum up from chemical residue. Logs must be digitally submitted to regulators.
• Fail-Safe Fire Valves: All bottom-outlet lines must feature fire-safe, API 607 certified emergency shutdown valves (ESVs) that automatically close via spring-return mechanisms if external ambient temperatures spike due to a fire.

We no longer live in the 1970’s and are perfectly capable of building and maintaining equipment that meets these standards. Do it.

Private Wells

 

Over the weekend I had a little fun with AI and made up some slides using the EPA website as source material.