Virginia has more military PFAS contamination sources due to its concentration of DoD installations, including the largest naval base in the world at Norfolk. Maryland has set state PFAS advisory levels and invested more in Chesapeake Bay watershed restoration. Both states share water quality challenges from the Potomac River and Chesapeake Bay, but Maryland has been more proactive on emerging contaminant regulation.
Virginia and Maryland flank the Chesapeake Bay and share the Potomac River watershed that supplies drinking water to the entire DC metro area. Their water quality challenges overlap – agricultural runoff, urban development, and military contamination affect both states. But regulatory approaches diverge. Maryland has taken a more precautionary stance on emerging contaminants, while Virginia's dense military presence creates contamination risks that few other states match.
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Virginia's Department of Health regulates approximately 2,900 community water systems serving 6.8 million residents. Maryland's Department of the Environment oversees about 750 community systems for 5.2 million people. Virginia's military footprint is massive – the state hosts more active-duty military personnel than any other, with major installations concentrated in Hampton Roads, Northern Virginia, and the Richmond corridor.
Check your water quality by zip code to see your system's EPA test results.
Virginia's military PFAS contamination is extensive. Naval Station Norfolk – the world's largest naval base – and the surrounding Hampton Roads complex have confirmed PFAS in groundwater. Langley Air Force Base, Fort Gregg-Adams (formerly Fort Lee), and Quantico Marine Corps Base all have documented contamination. According to DoD data from 2024, Virginia has more military PFAS sites than any state east of California.
Maryland's PFAS sources include Aberdeen Proving Ground, Andrews Joint Base, and Fort Meade. The state's smaller military footprint means fewer contamination sites, but industrial sources – including manufacturing along the Baltimore Harbor – contribute to detections in the metro area.
The Potomac River supplies drinking water to about 5 million people across both states and DC. The Washington Aqueduct, operated by the Army Corps of Engineers, treats Potomac River water for DC, Arlington, and parts of Fairfax County. Downstream communities in both states also draw from the Potomac and its tributaries.
Both states share the Chesapeake Bay watershed, where agricultural runoff – particularly nitrogen and phosphorus from poultry farms on the Delmarva Peninsula – degrades water quality. Maryland's Eastern Shore and Virginia's Shenandoah Valley are major agricultural contributors. The Chesapeake Bay Program, a multi-state partnership, has invested billions in restoration, but nutrient pollution remains stubbornly high.
Lead infrastructure varies by city. Baltimore has an estimated 38,000 lead service lines according to EPA inventory data from 2024. Richmond and Norfolk in Virginia also have legacy lead plumbing in pre-1950s neighborhoods. Both states are following the federal Lead and Copper Rule timeline for replacement.
Maryland has been more proactive. The state set PFAS advisory levels and directed the Maryland Department of the Environment to develop enforceable standards. Maryland also banned PFAS in food packaging in 2023 and restricted PFAS in firefighting foam. The state's Chesapeake Bay restoration commitments include some of the strictest nutrient runoff controls in the watershed.
Virginia has not set state-level PFAS standards beyond the federal MCL. The state's regulatory approach has been reactive – investigating known contamination sites as they surface rather than conducting broad screening. Virginia did pass legislation in 2023 requiring the state to study PFAS contamination and develop recommendations, but enforceable standards have not followed.
Maryland has the regulatory advantage. State advisory levels, PFAS product bans, and stronger Chesapeake Bay protections give Maryland residents more layers of defense. The state's investment in water infrastructure per capita exceeds Virginia's.
Virginia's military contamination burden is hard to overcome. With 30+ known PFAS sites from military installations alone, the state faces a remediation challenge that will take decades and billions of dollars – mostly from the federal government. Outside military-adjacent areas, Virginia's urban utilities generally meet standards, but the sheer density of contamination sources is a liability.
The verdict: Maryland provides stronger protections and has fewer contamination sources per capita. Virginia residents near military installations face elevated risk. For the shared Potomac River corridor, water quality is comparable – the source water is the same.
Check your water quality by zip code to see your specific system's data. Hampton Roads and Northern Virginia residents should check PFAS results given the military base density. Baltimore residents should check for lead.
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Detailed reports: get a water quality PDF report. State pages: Virginia and Maryland.
Is Virginia or Maryland water safer to drink? Maryland has stronger PFAS advisory levels, product bans, and Chesapeake Bay protections. Virginia has more military contamination sites but generally clean urban utilities outside military-adjacent areas. Your specific utility matters most – check your zip code at KnowYourExposure.com.
Is Potomac River water safe to drink? Potomac River water is treated before distribution and generally meets all federal standards after treatment. The Washington Aqueduct treats water for DC and parts of Virginia. Quality depends on your specific utility's treatment process – check your system's data for post-treatment contaminant levels.
Does Norfolk Virginia have PFAS in the water? The Hampton Roads area, including Norfolk, has confirmed PFAS contamination from Naval Station Norfolk and surrounding military installations. DoD testing has found PFAS in groundwater at multiple sites. Check your specific water system's UCMR5 results for current levels.
Does Baltimore have lead in its water? Baltimore has an estimated 38,000 lead service lines according to EPA inventory data from 2024. Lead leaches from pipes into drinking water, particularly in older neighborhoods. Point-of-use filtration is recommended for Baltimore homes with lead plumbing.
How does the Chesapeake Bay affect drinking water quality? Agricultural runoff into the Chesapeake Bay watershed – particularly nitrogen and phosphorus from poultry farms – degrades source water quality for communities that draw from bay tributaries. Treatment removes most contaminants, but nutrient pollution increases treatment costs and can affect taste.