Virginia Well Water Testing: What's Actually Required

What's actually required

Virginia's private well regulation, 12VAC5-630-431, is specific about this one moment: after a well is built and disinfected, "a sample of the water from the well shall be collected for bacteriological examination" Source 2: Commonwealth of Virginia, 12VAC5-630-431, Water Quality2. The well "shall be considered satisfactory if the water sample tests negative for coliform organisms."

If that first sample comes back positive, the rule doesn't stop there. The regulation requires "at least two consecutive samples" to test negative before the well is considered satisfactory Source 2: Commonwealth of Virginia, 12VAC5-630-431, Water Quality2. Those two samples have to be taken at least 24 hours apart. No disinfection is allowed in between them.

If the well still can't clear that bar, the rule has a second track. It allows continuous disinfection as a remedy, backed by daily sampling to prove the fix is working.

That is the entire legal requirement. It applies once, to a new well, not on any ongoing schedule to a well already in service.

What Virginia recommends, not requires

The Virginia Department of Health is direct about the boundary: "all subsequent testing is entirely at the discretion of the well user" Source 1: Virginia Department of Health, Office of Environmental Health Services, Guidance on testing your private well water1. What follows is guidance, stated as guidance.

• Bacteria and nitrate. VDH recommends annual testing for both.
• Basic indicators. An initial baseline test, then once every 5 years if nothing shows up.
• Radiological contaminants. At least one time, given naturally occurring uranium, gross alpha, and radon in Virginia's rock.

The National Ground Water Association's national well owner's guide lands on the same annual figure independently. It "recommends that all well owners test their water annually for bacteria, nitrate, and anything of local concern" Source 3: National Ground Water Association, Well Owner's Guide, 2021 edition3. Two sources agree, one national and one Virginia-specific. Neither one requires it by law.

VDH's guidance also lists conditions that call for testing beyond the standard panel, not on a schedule but tied to what's nearby. A well close to a gas station or an old fuel tank warrants a petroleum-constituents test. One near farmland or a golf course warrants a check for herbicides and pesticides. These are recommendations aimed at a specific, known risk, not a blanket requirement.

Why test even when it's not required

Virginia's government does not routinely test a private well for you. That's true nationally, not just here. Texas A&M AgriLife's well owner's guide states the same principle for any state: "the government does not routinely test household well water to make sure it is safe to drink." Once a well is built, "it is the well owner who is responsible" Source 4: Texas Well Owner Network, Texas A&M AgriLife Extension, Well Owner's Guide to Water Supply4. That responsibility doesn't shift to anyone else once the one required test is behind you.

It also matters because you can't tell by looking. NGWA's guide notes that many contaminants which "present a health risk have no odor, taste, or appearance" at all Source 3: National Ground Water Association, Well Owner's Guide, 2021 edition3. Bacteria and nitrate are both in that category. They're also the two contaminants VDH recommends testing for every year.

Real estate transactions

This is the most common source of confusion. VDH resolves it in one line: "water testing that is done in association with home purchases is not required by the VDH but may be required by the lender" Source 1: Virginia Department of Health, Office of Environmental Health Services, Guidance on testing your private well water1. If a test happens at closing, it's because a lender asked for it. It is not because Virginia law demands one.

That distinction matters for timing, too. A lender's required test happens on the lender's schedule, ahead of closing. It has nothing to do with the one-time test 12VAC5-630-431 requires when a well is first built, and it doesn't reset or replace that earlier requirement.

Where to get tested, and your local health department

Samples need to go to an accredited laboratory, not just any lab. Virginia's Division of Consolidated Laboratory Services accredits commercial labs for this through the Virginia Environmental Laboratory Accreditation Program Source 1: Virginia Department of Health, Office of Environmental Health Services, Guidance on testing your private well water1. A current list of accredited labs is available online.

There's also a lower-cost option. Virginia Cooperative Extension runs a statewide well-testing program, offering annual clinics at reduced cost. Program details and scheduling vary by district. Your local health department has the final word on what applies in your area.

Where this fits

For the full list of what to test for and why, see the guide to well water testing. If you're deciding what format of test actually produces a usable, certified result, see well water test kits. Once a result comes back, the guide to well water test results covers what the numbers mean. And for the broader picture of what owning a well involves day to day, see what owning a water well actually means.