Private Well Water in Virginia and Maryland: What the Law Actually Requires
Roughly 1.7 million Virginians rely on private wells — and almost none of that water is required to be tested after the well is drilled.
About 1.7 million Virginians get their drinking water from a private well, not a public utility. That comes with an important trade-off most homeowners don't learn about until they move in: private wells are almost entirely unregulated.
What the state actually requires
In Virginia, the only mandatory water test for a private well is a one-time coliform bacteria test at the time the well is drilled. After that, there is no legal requirement to test again, and no requirement to disclose water quality when a home is sold or rented. Maryland's rules are similarly limited, leaving private well testing almost entirely up to the homeowner.
The EPA sets legal contaminant limits for public water systems under the Safe Drinking Water Act. Those limits, called Maximum Contaminant Levels (MCLs), don't apply to private wells at all. They're commonly used as a reference point, but nothing forces a well owner to meet them.
What health officials recommend instead
The Virginia Department of Health and the National Ground Water Association recommend private well owners test:
— Annually for bacteria and nitrates
— Immediately if there's a change in taste, odor, or color
— After any flooding, well repair, or new contamination source nearby
— Before bringing an infant into the home
Because there's no statewide tracking system, there's also surprisingly little public data on how many DMV wells have a problem. Testing is voluntary, so most issues go undocumented and unfixed.
What this means day to day
If you're on a well, the water utility isn't doing this work for you. There's no annual water quality report showing up in your mailbox, and no automatic notification if something changes. The responsibility sits entirely with the homeowner, which is exactly why an annual test, and a filtration system sized to your specific water, matters more on a well than it does on municipal water.
