Virginia county well guide

Well Water in Prince William County, VA: Testing, Contractors and Rules

About 39,633 households in Prince William County, 22% of the county, rely on a private well. Nobody tests that water unless the owner does.

Labs within 40 milesLicensed contractors
22%of households on a private well
Share on wells, county vs state
Prince William County22%
Virginia average23%
2licensed contractors serve the county
13 mito the nearest certified lab, Water Testing Labs of Virginia
Nostatewide test required when a home is sold

Prince William County has an estimated 39,633 households on private wells, 22% of the county. If you are one of them, testing, treatment and repairs are yours to arrange.

Local rules for wells in Prince William County

Private wells in Prince William County follow Virginia's statewide rules, administered by Virginia Department of Health, Office of Environmental Health Services, through the local health departments. A water test is required when a new well is completed. There is no statewide test requirement when a home is sold, though lenders often ask for one. The cards below show the details and the official sources.

At a glance

Water test for a new wellRequired

Yes. A private well needs a construction permit from the local health department before drilling, must be built by a DPOR-licensed contractor with the Water Well/Pump specialty to the Private Well Regulations (grouted casing, setbacks of 50 ft from septic tanks and 100 ft from drainfields), and after completion the health department inspects it and requires a bacteriological sample that passes before the well is placed in service. The inspection statement is your record of the well.

Water test when a home is soldNot required statewide

No statewide requirement. The Residential Property Disclosure Act does not require a water test. FHA, VA and USDA loans normally require a bacteria, nitrate and lead sample from a certified lab before closing, and buyers can ask the local health department for the well's construction permit and inspection file.

What the state recommends

The Virginia Department of Health and the Virginia Household Water Quality Program recommend a coliform bacteria test every year and nitrate at least every three years, with a broader first test for hardness, iron, manganese, pH, sodium, copper, lead, arsenic and fluoride. Add radon and uranium in the Piedmont and Blue Ridge, sodium and chloride in Coastal Plain wells, and test again after flooding, well work or a change in taste, color or smell.

Free or low-cost testingAvailable

The Virginia Household Water Quality Program (Virginia Tech and Virginia Cooperative Extension) runs county drinking water clinics through the year: you pick up a kit from the Extension office, drop the sample back, and get results for 14 tests (bacteria, nitrate, metals, hardness, pH and more) with an interpretation meeting, for about $65, free in counties with grant funding. Local health departments and the VDACS regional animal health laboratories also run a bacteria test for a small fee.

Getting your water tested near Prince William County

11 certified labs within 40 miles serve Prince William County, starting with Water Testing Labs of Virginia in Burke (about 13 miles from the county center). Each card below shows whether the lab takes homeowner samples and which tests it is certified for.

8 certified labs within 40 miles

Licensed well contractors serving Prince William County

2 licensed contractors serve Prince William County, including Monticello Pump Services Inc and Northern Virginia Drilling Inc. Each profile carries the state license number and the date we checked it, and the filters below sort them by drilling, pump work or treatment.

Well depth and water chemistry

Wells in Prince William County typically reach 100 to 300 ft in the Coastal Plain sands east of I-95; 200 to 500 ft in the fractured rock of the Piedmont; 150 to 400 ft in the limestone valleys of the Shenandoah and Valley and Ridge; 200 to 600 ft in the Blue Ridge and the southwest coalfields. What comes up with the water depends on the aquifer, and across Virginia the usual suspects are coliform bacteria (the most common failure statewide, worst in the piedmont and the valley), hardness (shenandoah valley and other limestone areas), iron and manganese (coastal plain and piedmont). A first full panel tells you which of them apply to your well.

Typical well depth

Varies by location. Check the state well record search for logs of nearby wells.

Contaminants to test for
  • Coliform bacteria (the most common failure statewide
  • Worst in the Piedmont and the Valley)
  • Hardness (Shenandoah Valley and other limestone areas)
  • Iron and manganese (Coastal Plain and Piedmont)
  • Corrosive low-pH water that pulls lead and copper from plumbing (Piedmont and Blue Ridge)
  • Radon and uranium (Piedmont granite)
  • Sodium
  • Chloride and fluoride (deep Coastal Plain wells)
  • Nitrate (Shenandoah Valley farm country
  • Eastern Shore)
  • Arsenic (locally in the Coastal Plain)
  • PFAS near airfields and military bases

Neighboring counties: City of Manassas, City of Manassas Park, Fairfax County, City of Alexandria.

What well work costs in Prince William County

Basic bacteria and nitrate test$25 to $75lab fee, homeowner sample
Full panel lab test$150 to $400metals, VOCs, radiologicals
Well inspection$250 to $550flow, pressure, visual, water test
Submersible pump replacement$1,200 to $4,500parts and labor
Pressure tank replacement$400 to $1,200installed
Whole-house treatment system$800 to $6,000softener, iron filter, UV, RO
New well drilled$5,500 to $25,000about $25 to $65 per foot
Shock chlorination$80 to $300or about $20 as a DIY job

National ranges from published 2025 to 2026 contractor pricing. Local quotes vary with depth, access and materials.

Questions Prince William County well owners ask

How many homes in Prince William County are on a well?

About 39,633, or 22% of households, based on Census housing data and state well surveys. The share is highest outside the towns with public water.

Where is the closest certified lab to Prince William County?

Water Testing Labs of Virginia in Burke, about 13 miles away. Call first to ask whether they accept homeowner samples.

Do I need a permit to drill a well in Prince William County?

Yes. A private well needs a construction permit from the local health department before drilling, must be built by a DPOR-licensed contractor with the Water Well/Pump specialty to the Private Well Regulations (grouted casing, setbacks of 50 ft from septic tanks and 100 ft from drainfields), and after completion the health department inspects it and requires a bacteriological sample that passes before the well is placed in service. The inspection statement is your record of the well.

What does a well test cost near Prince William County?

A bacteria and nitrate test runs $25 to $75 at most certified labs; a full panel with metals is $150 to $400. Mail-in kits cost about the same as walking in.