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Well water testing in Uinta County, Wyoming

What official data says about private wells in Uinta County, what to test for, and the state-certified labs nearby.

People on private wells (2015)3,684

About 18% of the county's 20,822 residents. Rank 12 of 23 in Wyoming.

Arsenic above EPA’s limit (USGS estimate)about 211 people

95% range 169 to 265 private-well users (2010 base year). Rank 9 of 23 in Wyoming.

EPA radon zone (indoor air)Zone 1

Highest potential (average indoor radon may be greater than 4 pCi/L). EPA says the map should not be used to decide whether an individual home needs testing.

Certified labs in this county0

Labs with an address in this county, from the official state lists on this site, matched by ZIP code.

What to test for in Uinta County

Private wells are not regulated like public water: EPA advises owners to test their well every year for total coliform bacteria, nitrates, total dissolved solids and pH. Your state's own schedule:

  • Wyoming DEQ recommends testing for bacteria (E. coli, total coliform) and nitrates every year, and for arsenic, lead, copper, iron, manganese, sulfate and total dissolved solids every five years. It notes that uranium, radium, selenium and methane are also common in Wyoming groundwater, and that owners in areas of possible oil and gas development should test for more. source
  • DEQ also says to test right away if the taste, color or odor of your water changes or someone in the household has an unexplained illness, and to test when someone in the home is pregnant, an infant, elderly or has a health condition. source

Arsenic. USGS estimates that about 211 people using private wells in Uinta County had arsenic above 10 µg/L, EPA's limit for public water (2010 base year; 95% range 169 to 265). USGS describes this kind of estimate as useful "for broad screening of the population at risk", so it says nothing certain about any one well. Arsenic has no taste or smell: test for it by name.

Radon. EPA puts Uinta County in Zone 1: highest potential (average indoor radon may be greater than 4 pCi/L). That map is about radon in indoor air, and EPA says it should not be used to decide whether an individual home needs testing. If radon is found in your air and you have a well, EPA suggests testing the water too: see radon in well water.

For anything specific to your home (farms nearby, old plumbing, a new baby, a smell or stain), use the which-tests checklist. When the results arrive, check your numbers against EPA's limits.

Estimated private-well users with arsenic above 10 µg/L: Uinta County and Wyoming's highest countiespeople (2010 base year)
Show the numbers
ItemValueNote
Laramie County1,525 people (2010 base year)
Fremont County1,417 people (2010 base year)
Sublette County347 people (2010 base year)
Natrona County335 people (2010 base year)
Park County332 people (2010 base year)
Uinta County (this county)211 people (2010 base year)

USGS model estimate for broad screening, not a measurement of any well. Only a test tells you about your own well. Source: USGS, Estimated county level domestic well population with arsenic greater than 10 micrograms per liter (Ayotte, Medalie and Qi, 2017), accessed 2026-11-01.

Testing programs and help in Wyoming

  • DEQ's Know Your Well program helps private well owners with water quality questions, including reading lab results. DEQ also points owners to the Be Well Informed web tool, which Wyoming partners on, to check results against drinking water standards. source
  • DEQ says local health departments in Wyoming can give information and guidance on well water testing and health effects. source

Buying a home with a well in Uinta County

Loan test (FHA, VA, USDA) in Uinta County, WY

  • VA. Test results are valid for 90 days from the date the local health authority certifies them, unless the local authority says otherwise. VA’s chapter names no list of contaminants: the water must meet the local health authority’s requirements, or EPA guidelines where it has none. Your lender may ask for specific tests.
  • FHA. A well test is required in the situations FHA’s handbook lists, among others, and the report may not be more than 180 days old at disbursement.
  • USDA. Guaranteed loans need a water quality test for a private well, done by the local health authority or a state-certified lab, and no more than 180 days old at closing.

Lenders can ask for more (extra tests, a particular lab, who takes the sample): ask your lender before you book. Federal rules as read on Nov 3, 2026 source 1 source 2 source 3. Full comparison: VA, FHA and USDA well water test requirements. Loan test kits sold by mail, with price and days to results: kits compared.

State-certified labs in Uinta County

None of the labs on our Wyoming list has an address in Uinta County. Labs elsewhere in the state may take samples by mail or courier: ask the lab, and check the hold time for bacteria before you send one.

See all Wyoming labs in the finder and filter by the test you need and by labs that take homeowner samples.

Sources and method Private-well population is the USGS 2015 estimate of people on domestic self-supplied water. The arsenic figure is a USGS model estimate on a 2010 population base, not a count of tested wells. Labs are placed in a county by the ZIP code on the state list. These figures come from different USGS products, years and methods, so they can disagree with each other (for example, the arsenic estimate and the well population use different base years). Read them as context for the county, not as facts about any one well. Checked 1 Nov 2026. General information, not medical advice.
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