Protect Our Groundwater

Tomorrow, September 7, 2021, is national Protect Your Groundwater Day. This annual event is sponsored by the National Groundwater Association to raise awareness of what you can do to prevent groundwater contamination. However, groundwater is also in danger from unsustainable use during droughts, changing rain and snowfall patterns or from overuse.

I am one of the 13 million U.S. households whose water is supplied by a private well. In addition, there are 107,848 community supply groundwater wells that supply water to 40,301 community public water systems. The National Ground Water Association reports that 44 % of the U.S. population depends on groundwater for its drinking water supply from either a public source or private well. Since many public water system draw all or part of their supply from groundwater, protecting groundwater from contamination protects the water supply and impacts the costs for water purification and treatment. There was a time when groundwater was considered to be free from contamination, but that is no longer true. As population density increases and we use more and more chemicals, pesticides and drugs, there are more opportunities to contaminate our groundwater.

While community wells are required to test their water under the Safe Drinking Water Act, if you have your own well, then the responsibility for ensuring that your family and friends are drinking safe water rests with you. Just because your water appears clear doesn’t necessarily mean it is safe to drink. You cannot taste bacterial contamination from human and animal waste, nor nitrate/ nitrite contamination. Many chemical contaminants cannot be tasted or smelled at levels that can impact your health. The National Groundwater Association recommends that all drinking water wells should be tested for Coliform bacteria and E Coli annually. Testing is the only way to detect contamination in your water. Testing is not mandatory, but should be done to ensure your family’s safety.

Groundwater comes from rain water and snow melt percolating into the ground. Typically, the deeper the well the further away is the water origination and the older the water. The groundwater age is a function of local geology, the amount of precipitation and the rate that water is pumped out of the aquifer. In the time before we began using the groundwater, it was in equilibrium. Mankind changed that in ways we do not fully understand. Groundwater is connected to surface water in ways we do not yet fully understand, but are beginning to study.

Geology is a major determinant of the ease with which water and contaminants can travel through an aquifer; microorganisms in the soil and from wildlife and spilled chemicals or contaminated runoff can travel into groundwater supplies through cracks, fissures, and other pathways of opportunity like fractured rock systems. The land surface through which groundwater is recharged must remain open and uncontaminated to maintain the quality and quantity of groundwater.

Nitrate concentrations are often elevated in shallow groundwater because of agricultural and suburban development. Bacteria and nitrate contamination to groundwater can be caused by human and animal waste. Poorly managed septic systems, horses, backyard poultry can cause contaminate groundwater by overwhelming the ability of the soil to filer these contaminants or finding an opportunistic pathway through a fissure or other geological entry. An emerging concern in recent years has been the occurrence of pharmaceuticals and personal care products in septic waste water. Nitrate contamination can serve as a proxy for other trace contaminants in septic systems. Heavy local use of pesticides for ornamental gardens or farms, buried waste, and leaks from underground fuel tanks can be sources of contamination.

Households and businsesses can introduce solvents, motor oil, and paint; paint thinner, water treatment chemicals and others substances by spilling them, or pouring chemicals into the ground or down the drain into a septic system. Groundwater protection depends on the entire community. The National Groundwater Association recommends: That everyone store hazardous household substances safely in a sealed container in a secure place and use hazardous substances only according to the manufacturer’s recommendations. Hazardous substances should be disposed of safely and properly. Be mindful of your water use, install WaterSense fixtures and limit exterior water use. If you own  water well, make sure that all possible contamination sources are a safe distance from the wellhead (50-100 feet), make sure your septic system is operating and maintained properly and is regularly inspected and the tank is regularly pumped. Also, test your water annually.