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. 

The Case for Funding and Building a Groundwater Monitoring Network

Groundwater is a critical part of our water supply and the hidden reserve that sustains streams, wetlands, private wells, and public water systems during dry periods. In a watershed like the Culpeper Basin, long-term water security depends on keeping withdrawals in balance with recharge. That balance can no longer be assumed. Development has increased impervious cover, droughts have become more consequential, and local observations suggest that groundwater conditions may be changing faster than rainfall alone would explain. Yet we still lack the one thing needed to manage the resource responsibly: a reliable, long-term network of monitoring wells.

Here in Haymarket, there are visible warning signs that deserve attention. Observations from the Bull Run Mountain Conservancy showed perennial streams such as Little Bull Run and Catlett’s Branch going dry during a dry August, while Catharpin Creek was reduced to isolated pools. When streams that are expected to flow year-round begin to fail, that suggests a loss of groundwater support to surface water. In other words, what appears to be a streamflow problem may actually be a groundwater storage problem. Those field observations do not prove the full extent of the issue, but they underscore why direct groundwater monitoring is urgently needed.

Nearby jurisdictions are already building the technical case for systematic monitoring. The Fauquier County Groundwater Resource Assessment and Monitoring Study states that regional- and local-scale data are needed to manage aquifer withdrawals, evaluate water-level declines, identify contributing areas to wells, assess interconnections among pumping wells, and quantify interactions between groundwater and streams. It further notes that surface-water and groundwater monitoring networks are being established specifically to define current conditions and support future investigations. That is directly relevant here: a monitoring network is not simply descriptive; it is the basic infrastructure required to estimate sustainable yield, detect drawdown trends, and evaluate the hydrologic consequences of additional pumping or land use changes.

Regional evidence from Loudoun County points in the same direction. The Assessment of the Groundwater Supply in Loudoun County compiles long-term groundwater, streamflow, and drought information and concludes that groundwater conditions have worsened over the past several decades. The report documents declining water levels, dry wells, springs, and ponds, and argues that parts of western Loudoun are withdrawing groundwater faster than it can be replenished by natural recharge. Whether one accepts every inference in that assessment or not, the central point is difficult to dismiss: without a sufficiently dense and continuous monitoring record, it is impossible to distinguish temporary drought effects from persistent storage decline or to determine whether current withdrawals are within sustainable limits.

That matters because a falling water table affects more than individual wells. As groundwater levels drop, less water remains stored in soil, regolith, and fractured bedrock, and streams can lose the groundwater contribution that keeps them flowing between storms. Once that connection weakens, drought impacts intensify: wells become more vulnerable, streamflow becomes flashier and less reliable, and ecosystems lose the steady baseflow they depend on.

Field observations before and after major land-use change point to a consistent pattern of groundwater stress:

• Wells are being drilled deeper.
• Surface runoff has increased.
• Infiltration and groundwater recharge have decreased.
•  Some ponds, wells, and springs have permanently gone dry.
• The water table has dropped from above the top of bedrock to below it in many locations.
•  Groundwater storage in weathered bedrock has diminished.
•  Some streams and creeks are no longer reliably gaining flow from groundwater and may lose water when nearby wells are pumped.

The cost of waiting can be enormous. When communities discover groundwater problems only after wells fail, the response often shifts from planning to crisis management: emergency well drilling, interconnections, treatment upgrades, or costly new supply projects. A monitoring network is far less expensive than reacting after shortages become acute. It provides the early warning needed to avoid missteps, target conservation measures, and make infrastructure decisions before a water emergency forces them.

This is why proactive planning matters. A groundwater monitoring network would allow local officials, utilities, planners, and residents to track long-term trends, distinguish drought effects from over-withdrawal, identify vulnerable areas, and evaluate whether current land-use and water-supply decisions are sustainable. Without that information, policy is forced to rely on assumptions and guesses. With monitoring, decisions can be based on evidence that is collected over time.

The stakes extend beyond individual wells. The Occoquan Reservoir is one of two major water sources for the Fairfax Water that it supplies water to about one million people in Northern Virginia. Because groundwater storage influences baseflow to tributaries across the watershed, and baseflow in turn contributes to reservoir inflows during dry periods, uncertainty about groundwater conditions is also uncertainty about regional drought resilience. A local monitoring network would therefore support not only private-well protection, but also broader watershed-scale planning around water quantity and hydrologic reliability.

Modeling can be useful, but in fractured-rock aquifers it is inherently a simplification of a highly heterogeneous system. In Virginia’s Piedmont, Blue Ridge, and Mesozoic basin settings, groundwater occurrence and movement vary significantly with local geology, fracture density, weathered-regolith thickness, and topographic position. The Groundwater Characterization and Monitoring Program notes that, in these hard-rock provinces, groundwater occurs mainly in fractures and joints and that hydrogeologic conditions vary substantially from place to place. For that reason, recharge estimates derived from gridded inputs alone cannot establish whether a particular area is recovering seasonally, trending downward over multiple years, or losing hydraulic support to nearby streams. Continuous groundwater-level monitoring is what converts a conceptual understanding of recharge into an observable record of aquifer response.

Soil-Water-Balance (SWB) models often a cheap and quick way to estimate potential recharge, are not direct proof of sustainable yield. The U.S. Geological Survey’s Soil-Water-Balance software is explicitly designed to estimate potential groundwater recharge from daily climate, land use, soil, and flow-direction inputs. The Fauquier County SWB application used that framework to estimate recharge to fractured-rock aquifers and calibrated results in part with base-flow estimates from stream gages. Those are useful screening tools, but they do not directly measure aquifer storage change, drawdown, or the timing and location of recharge transmission through discrete fracture networks. In fractured-rock systems like the Culpeper Basin, water moving below the root zone may still be delayed, diverted laterally, taken up again, or discharged to surface water before it produces measurable recovery in the deeper aquifer tapped by wells. The practical implication is straightforward: modeled recharge can inform hypotheses, but only direct groundwater-level observations can test whether the aquifer is actually recovering at a rate consistent with current and projected withdrawals.

That is the core reason to fund and build a monitoring network now. A well-designed network would provide continuous water-level data, establish local trends, improve drought response, strengthen land-use planning, and help protect both private wells and downstream surface waters. It would also give the public and decision-makers a shared factual basis for difficult choices about growth, conservation, and infrastructure. If groundwater is to remain sustainable, the first step is to measure the system directly and manage it before avoidable damage becomes irreversible.

Reforest Prince William

While continuing to rezone to increase housing density and build data centers, Prince William County is also taking steps to address decades of loss of precious forestland. A re-forestation program called Reforest PWC has been getting started in the past two years.

Tree canopies play a crucial role in supporting environmental and human health. A tree canopy shades the ground below, providing a continuous cover created by the branches and foliage of multiple trees. Tree canopies provide shade, sheltering wildlife, regulating temperatures (through shade and evapotranspiration), intercepting rainfall, and contributing to air purification by absorbing carbon dioxide and releasing oxygen through photosynthesis. In urban environments, the tree canopy improves the overall environmental quality by reducing heat and stormwater flow.

Yet, Virginians continue to lose trees at an alarming rate. Virginia’s tree canopy decreased 19% from 2001-2023. The research shows that Prince William County and Loudoun County have lost nearly 5,400 acres of tree canopy to development from 2014-2021; the construction data centers, housing developments, road expansions and electrical transmission lines. The loss of tree canopies diminishes our environment’s capacity to filter water pollutants and reduce air pollution and smog and maintain the functioning of our essential Occoquan Watershed.

In 2023, the Reforest PWC program began as an opportunity for residents to reforest their own property with free trees and labor provided by the County. Reforest PWC has already been responsible for the planting of over 44,000 trees across large tracts of land in the County, most of it privately owned. This has resulted in over 48 acres of new permanent wildlife habitat being created (though a fraction of what was removed by development). This is just the beginning. With sufficient funding, tens of thousands more trees are planned for planting over the next decade, and community participation will play a vital role in achieving this goal.

Calling All Residents

The biggest challenge for this program is finding both suitable land and receptive landowners to begin the reforestation process. However, once a favorable consultation determines the project is a good match, the actual installation of the trees is completely free. Any eligible landowner in the county can participate in the program, provided there is sufficient planting space on their property. Ideal locations often consist of half-acre to multiple acre lots with large sections of lawn or grassland. These types of sites allow sufficient sunlight for newly planted trees to grow and establish quickly, generating new healthy forests in a shorter amount of time.

Why Reforest?

Reforestation provides many benefits to homeowners, beginning with significant time and cost savings. For example homes located in the former Rural Crescent areas of Nokesville and Haymarket include up to ten acres of recently converted farm fields that require frequent mowing. If a homeowner hires a local landscaping company, this maintenance can cost approximately hundreds of dollars per week, or up to $12,000 for the growing season. By contrast, a forest requires limited maintenance for forest health once established. No mowing, no fertilizing, and less lawn to rake means more time and money saved.

Forested areas of a property offer additional advantages as well. Forests help protect viewsheds and privacy, increase property values, reduce road noise, act as wind buffers for exposed properties, help filter well water, provide valuable wildlife habitat, and prevent erosion. When it comes to improving a property, reforestation is one of the best long-term investments a landowner can make, offering a strong return over time. This is especially true given that the Reforest PWC program is completely free for eligible landowners in Prince William County.

What is the Process?

The application process begins with an in-person, onsite meeting with the County Arborist to determine whether a property is a good candidate for reforestation. If the site qualifies and the landowner agrees to participate, a planting date is scheduled for either fall or spring, depending on availability. County-supervised contractors then plant approximately 450 to 600 native trees per acre, as site conditions allow.

The species mix includes a diverse selection of native deciduous and evergreen trees, with a balance of overstory and understory species, as well as shrubs. This intentional diversity supports long-term ecological resilience, enhances wildlife habitat, and restores the layered structure of a natural forest. A varied species mix is also more resilient to climate change, invasive species, and extreme weather events, helping ensure these reforestation efforts endure for decades to come.

What’s the Catch?

Naturally, a reforestation program of this scale may seem too good to be true. With an estimated planting value of approximately $10,000 per acre, this is no small investment. While such an offer may raise questions or skepticism, Reforest PWC is truly 100% free for all County residents.

After agreeing to participate in an onsite planting project, the landowner signs a Memorandum of Understanding committing to keep the planted forest area undisturbed in the future, including no mowing or construction. This agreement does not place the property under a formal easement or impose a legally binding land use classification that would affect future resale. Rather, it represents a good-faith commitment by the landowner to protect a valuable ecological investment that will benefit the County for generations to come.

A Future Rooted in Restoration

Reforest PWC is a forward-thinking investment in the landscapes we all share. It restores what has been lost, protects what we have left, and builds a legacy of good environmental stewardship for generations to come. By participating today, you help shape a greener, healthier, and more resilient future for Prince William County. The best time to plant a tree may have been 100 years ago, but the next best time is always today. It is never too late to take action for the good of our environment.

How to Apply

To learn more about eligibility or to start the application process, residents are encouraged to apply via this link. After submitting your application, staff will contact you to arrange a site visit to your property. We look forward to partnering with our residents to restore and grow new forests throughout the County.

Prince William Landfill Keeps Moving Forward

Prince William Landfill is right off Dumfries Road in Manassas, VA and has operated at this location since 1972 when it was merely the county dump. Today the landfill encompasses 1,000 acres, receives a little under 1,000 tons/day of household trash, and has extensive environmental controls.

The oldest section of the landfill contains 57 acres that were closed in 1991 when the state law that regulates landfills (HB 1205) went into effect. That area has undergone retrofit with liners and leachate and landfill gas collection systems to protect the environment in an ongoing effort to manage the problems we created in the past. The newer section of the landfill was designed to comply with modern environmental regulations and sustainable practices.

Today Prince William County Landfill is engineered and built as a series of cells. The cells include liners of plastic membranes and watertight geo-synthetic clay liner fabric on the bottom of the cells along with a leachate collection system. At the end of each day, earth covers the trash deposited in the cell, to keep animals away, improve aesthetics- cut down on the smell. When a cell is full it is capped to prevent (or at least limit) the rain that percolates through the landfill and covered in soil.

In 2025 Cell 3B was opened and Phase II capping took place. The area capped was filled, compacted and covered with a lining and soil suitable for grass to grow and stabilize the slope. Phase I was capped about 10 years earlier. Prince William Landfill has operated for half a century.  Landfill gas is generated during the natural process of bacterial decomposition of organic material contained in the trash buried in the landfill. Landfill gas is approximately forty to sixty percent methane, with the remainder being mostly carbon dioxide. Landfill gas also contains varying amounts of nitrogen, oxygen, water vapor, sulfur, and other contaminants. The gases produced within the landfill are either collected and flared off or used. The landfill gas cannot be allowed to build up in the landfill because of the explosive potential. 

Landfill gas is a renewable energy source. Landfill gas that is used to produce energy does not have to be flared and wasted. In 1998 the County formed a partnership with NEO Prince William to install a landfill gas collection system and a 1.9 MW energy recover facility which was a two-engine turbine that burned the gas to make electricity that was sold to NOVEC, the local electric cooperative. The 1.9 MW energy recovery system was utilizing less than 25% of the currently available landfill gas for energy recovery. Any excess gas was being flared.

OPAL Fuels, previously known as FORTISTAR who acquired NEO, continued to collect the landfill gas (LFG) and generate electricity using onsite engines, expanding the system over the years. The initial two 16-cylinder CAD engines were added to in 2013. A new building was built to house three additional larger 20-cylinder engines. The five engines consumed approximately half of the gas produced by the Landfill by turning turbines to produce 6.7 megawatts (MW) of electricity. To handle the other half of the gas produced, the Landfill has been using flares to destroy the methane for several years.

In September 2021, the board of county supervisors voted unanimously to allow OPAL Fuels to retire its generators and design and install a renewable natural gas production facility at the landfill. OPAL Fuels would provide capital and operate the facility,  but share the profits with Prince William County. In addition, air emissions would be reduced. The new RNG facility eliminates combustion of LFG in the flares and the engine facility, instead converting the LFG to consumer-grade RNG with a 95% conversion efficiency. Also, it was anticipated that revenue to the country would increase.

from PW Landfill

At full output, the RNG facility will produce approximately 12.4 million gas gallon equivalents (GGE) of RNG per year which will be used as vehicle fuel or to provide energy to homes and businesses. The end use of the RNG off-site will create additional environmental benefits by replacing fossil fuels. The profit share for the Electricity Generation Plant was about $250,000 annually. The profit share for the RNG Plant will be a minimum of $400,000 annually and can be upwards of $1 million, depending on the price of natural gas and the volume of gas sold. Natural gas prices are volatile.

The transition at the landfill from electricity generation to renewable natural gas (RNG) production was finished in early 2024, marking a shift from on-site power turbines to a high-efficiency processing facility. This change is a key part of the county's Eco-Park vision, which aims to convert the landfill into a hub for multiple renewable energy sources, including solar.

The 10MW electrical transmission lines and interconnects to NOVEC previously used by the 6.7 MW gas plant simplifies the process for solar integration. This existing infrastructure can now be used to feed solar-generated power back into the grid NOVEC. The county's long-term plan for the Eco-Park includes installing solar panels on sections of the landfill that have reached capacity and been capped. By shifting gas processing to a smaller, more efficient footprint, more surface area becomes available for solar arrays.

Drought 2026

Last week when the U.S. Drought Monitor published the current status. All of Virginia was noted to be in Drought with 97.39% (dark orange) in severe drought and 17.57% in extreme drought (red area). Since the beginning of the water year on September 30, 2025 Haymarket has experienced 15.76 inches of rain. Average for that period of time is 23.16 inches of rain. The drought continues to build.

The dry conditions in Virginia have prompted several local governments to institute burn bans due to increased wildfire risk. Droughts in Virginia can have far-reaching impacts on agriculture, water availability, and wildfires. Yet, the largest irrigated crop in Virginia is suburban lawns. The Virginia Department of Environmental Quality (DEQ) has placed the region under a drought warning, which indicates that a "significant drought event is imminent".

Most of the Potomac watershed is now experiencing abnormally dry conditions due to a record-breaking lack of rainfall since 2024. Due to these conditions, the water utilities are encouraging customers to practice wise water use for indoor activities—like washing clothes and dishes, showering, and brushing your teeth—and for outside uses like watering their lawns or washing their cars. Prince William Water has wise water use tips that suggest if you are continuing to water your lawn, only water three days a week and avoid the peak water times (set on all your automatic sprinkler systems) of 4-8 am.  

The Washington DC metropolitan area is home to over 5 million residents who rely on the Potomac River for approximately 75% of their drinking water. Since the early 1980s, the three major water suppliers in Maryland, Virginia, and the District of Columbia have operated as a cooperative regional system to ensure reliable access to this shared resource. Until very recently, despite significant population growth, water demand has remained essentially flat due to widespread adoption of water-saving fixtures and appliances, but there is little that can be achieved with water-saving fixtures. Now, the addition of suburban lawns and data centers is increasing water use especially in the summer months.

The ICPRB reports that new record low flows continue to be set. Last week, the USGS gage at Little Falls is 3,570 cubic feet per second, while the 96-year historical low for this time of year had been 3,820 cubic feet per second. That low was set in 1969, not coincidentally around the same time that ICPRB’s Section for Cooperative Water Supply Operations on the Potomac was established to manage drought. So, unless the watershed get lots of rain in the coming months, it appears we are headed into a drought of historical proportions. 

The ICPRB believes that there is an above-normal probability our region needing releases from the Washington metropolitan area’s back-up water supply reservoirs for the 2026 summer and fall seasons. Typically, the use of the Jennings Randolph and Little Seneca reservoirs is triggered by low river flows resulting from a combination of low summer precipitation and low groundwater levels. 

Now is the time to be water wise. For me, I am avoiding replanting anything this year and leave the lawn to the weeds, dirt and bald spots until the drought is over. I will continue to fill the gator bag on the 6 inch caliper maple that I bought a few years back, the redbud recently planted.