Arsenic is worth checking in Laramie County wells.
1 worth checking, 5 rare out of 6 health checks.
From 41 wells tested in Laramie County since 2000; your own well needs its own test. How to read this
Not charted, because fewer than 10 wells were tested: radon (7).
Rare: under 5%Worth checking: 5 to 15%Widespread: 15%+
Lab results: Water Quality Portal (USGS and EPA)
Who drinks from a well here
1 in 5 people 20,492 people
Nobody else tests these wells. Only you do.
People on wells: EPA researchers' 2020 estimate
How deep wells go here
Deep wells: fewer surface germs, more minerals from the rock.
Well depths: US Groundwater Well Database
Radon risk (a gas from rock)
Likely here. Test your home's air first.
Radon zones: EPA map
Here's how Laramie County compares with Wyoming and the counties around it.
Each result puts Laramie County next to the 7 counties that border it, on the chart's 0 to 50% scale.
This one is worth checking in Laramie County.
Arsenic2 of 34 wells over
Too few tested to show: Banner, NE, Kimball, NE, Larimer, CO.
These 5 are rare in Laramie County.
Nitrate1 of 41 wells over
* Likely overstated, so we don't rank it.
Too few tested to show: Kimball, NE, Larimer, CO.
Uranium0 of 34 wells over
Too few tested to show: Banner, NE, Kimball, NE, Larimer, CO.
Manganese0 of 34 wells over
Too few tested to show: Kimball, NE, Larimer, CO.
Fluoride0 of 34 wells over
Too few tested to show: Kimball, NE, Larimer, CO.
Lead0 of 34 wells over
Too few tested to show: Banner, NE, Kimball, NE, Larimer, CO.
Too few Laramie County wells were tested for this one.
Radon in water7 wells tested
Coliform bacteria turned up in 4 of 29 tested Laramie County wells, so test for it every year.
Coliform bacteria4 of 29 wells had it
Too few tested to show: Banner, NE, Kimball, NE, Larimer, CO, Weld, CO.
E. coli1 of 29 wells had it
Too few tested to show: Banner, NE, Kimball, NE, Larimer, CO, Weld, CO.
E. coli means human or animal waste is getting in, so if a test of your Laramie County well finds it, boil drinking water until the well is fixed.
Iron reached staining levels in 1 of 34 tested wells, and it isn't a health risk.
Iron stains1 of 34 wells had it
Too few tested to show: Kimball, NE, Larimer, CO.
Laramie County has 41 tested wells, and the busiest decade for testing was the 2010s.
Only 1 of the 41 wells have a test from 2020 or later, so a fresh test of your own well tells you more than any of these.
Most Laramie County wells in these records were tested for research or because someone suspected a problem, which can push the shares above what a typical home well would show (how we read the numbers).
One mail-in lab test covers the 3 things to check in Laramie County.
- Bacteria
- Nitrate
- Arsenic
What Wyoming offers well owners
- Free testingWe didn't find a free program for all of Wyoming. Wyoming's private well page
- Certified labsWyoming's list of certified labs
- Well recordsWyoming's well record search
Half the household wells here are shallower than 380 feet.
That comes from 5,785 household wells in Wyoming's drilling records. Most wells of every kind here are 175 to 460 feet deep. Wells as deep as Laramie County's are usually better protected from fertilizer and bacteria at the surface, but they can pick up more of what's in the rock, like arsenic and uranium. Typical household wells here go deeper than in 21 of the 22 other Wyoming counties with enough drilling records.
Look up your own well's depth in Wyoming's well record search, or see how to find it.
Well depths: US Groundwater Well Database
Here's what we know about radon and PFAS in Laramie County.
Laramie County is in the EPA's highest radon zone. Radon from well water adds to the radon in your indoor air, so test your air first, and your water too if the air is high. Radon guide
Between 2023 and 2025 the EPA had 3 town water systems in Laramie County test for PFAS. None found any. No well in Laramie County has public PFAS results, so the town systems are the best clue to what's in the groundwater nearby. PFAS guide
Radon zones: EPA Map of Radon Zones. PFAS: EPA tests of town water systems, 2023 to 2025
Questions people ask about well water in Laramie County
Is well water in Laramie County safe to drink?
2 of 34 wells tested in Laramie County had arsenic over the limit, about 1 in 17. Across Wyoming it's about 1 in 18. That's a bigger share than in 11 of the 15 other Wyoming counties with 10 or more tested wells. So test your own well for arsenic before you count on it.
Where can I get my well tested in Laramie County?
Use a lab Wyoming has certified for drinking water. Wyoming's list is linked above, in the box about testing. Ask for bacteria, nitrate and arsenic, the tests that matter most in Laramie County.
How deep are wells in Laramie County?
Half the household wells here are shallower than 380 feet. Typical household wells here go deeper than in 21 of the 22 other Wyoming counties with enough drilling records.
How does Laramie County compare with the counties around it?
For arsenic, the share of tested wells over the limit: Laramie County, at 6%, had a higher share than all 4 neighboring counties with data. Groundwater doesn't stop at county lines, so Goshen's 4% is worth knowing about if you live near it.
How often should I test my well in Laramie County?
In Laramie County, 4 of 29 tested wells had coliform bacteria, so the CDC's advice matters here: test for bacteria and nitrate every year, and right away after a flood, a repair, or any change in taste or smell.
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Where the Laramie County numbers come from
- People on wells: 20,492 in Laramie County, from EPA estimates built on the 2020 Census (Murray et al.).
- Lab tests: 314 well water samples from 41 wells in the Water Quality Portal, run by the USGS and EPA, 2000 to 2021.
- Well depths: 5,785 Wyoming drilling records for Laramie County, gathered in the US Groundwater Well Database (Lin and others, 2024).
- Neighboring counties: the 7 counties that share a border with Laramie County, from the Census Bureau's county adjacency file.
- PFAS: EPA tests of 3 town water systems in Laramie County under the Fifth Unregulated Contaminant Monitoring Rule, 2023 to 2025.
- Radon: Laramie County is zone 1 on the EPA Map of Radon Zones.
- State programs and links: Department of Environmental Quality (DEQ), Know Your Well program, checked November 1, 2026.