Nitrate in Wyoming well water
In Wyoming, 14% of 8,356 tested private well samples exceeded the EPA limit for nitrate (10 mg/L).
Nitrate reaches wells from fertilizer, septic systems and manure. Above the limit it can cause methemoglobinemia (blue baby syndrome) in infants under six months, and long-term exposure is associated with some cancers. Shallow and dug wells near farmland or dense septic systems are most at risk.
Check your nitrate number
Type the value from your lab report. It is compared to the EPA limit, the same way the full interpretation does it.
Test your Wyoming well for nitrate
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
Order the Tap Score well water test kit, from $209Already tested? Upload the report
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Systems that remove nitrate
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Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.
For nitrate
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
For nitrate
Aquasana SmartFlow reverse osmosis
under-sink or countertop, about $225
Certified to NSF/ANSI 58 and 53 to reduce arsenic (96%, pentavalent), fluoride (90%), lead (99%), nitrate, nitrite and PFOA/PFOS at the kitchen tap, with a remineralizer.
Rather have it installed and sized for your well? Book a free in-home water test with a licensed local company.
Where to get a well tested for nitrate in Wyoming: certified labs, state programs and prices.
By county, from individual samples
Public monitoring samples against the EPA limit (10 mg/L); counties with at least 30 samples.
| County | Above EPA limit | Samples | Detected | Median | Highest |
|---|---|---|---|---|---|
| Goshen | 1,369 | 99% | 9.82 | 208 mg/L | |
| Natrona | 166 | 90% | 2.12 | 2,440 mg/L | |
| Niobrara | 92 | 92% | 3.15 | 176 mg/L | |
| Johnson | 222 | 63% | 0.237 | 2,080 mg/L | |
| Laramie | 331 | 95% | 3.2 | 63.3 mg/L | |
| Hot Springs | 118 | 65% | 0.285 | 240 mg/L | |
| Washakie | 175 | 87% | 0.8 | 349 mg/L | |
| Platte | 118 | 99% | 3.35 | 57.2 mg/L | |
| Park | 363 | 91% | 2.4 | 150 mg/L | |
| Converse | 190 | 79% | 0.354 | 49.8 mg/L | |
| Uinta | 114 | 79% | 0.402 | 130 mg/L | |
| Lincoln | 417 | 92% | 1.2 | 262 mg/L | |
| Big Horn | 340 | 90% | 1.28 | 51 mg/L | |
| Sweetwater | 363 | 64% | 0.03 | 174 mg/L | |
| Crook | 163 | 88% | 0.58 | 50.8 mg/L |
- Rawhide Creek CCD, Goshen County53% of 224
- Torrington CCD, Goshen County50% of 1,084
- Casper CCD, Natrona County48% of 33
- Cheyenne CCD, Laramie County33% of 33
- Kaycee CCD, Johnson County31% of 145
- West Niobrara CCD, Niobrara County29% of 48
- Hells Half Acre CCD, Natrona County27% of 84
- Thermopolis West CCD, Hot Springs County22% of 74
- Worland CCD, Washakie County21% of 104
- Powell CCD, Park County21% of 130
- East Niobrara CCD, Niobrara County18% of 44
- Cheyenne West CCD, Laramie County16% of 74
- Kemmerer West CCD, Lincoln County16% of 45
- Pine Bluffs CCD, Laramie County15% of 166
- Wheatland CCD, Platte County15% of 54
- Cody CCD, Park County14% of 63
- Evanston CCD, Uinta County14% of 58
- Douglas CCD, Converse County13% of 129
- Hulett CCD, Crook County13% of 69
- Rock Springs North CCD, Sweetwater County13% of 95
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. nitrate counts and shares are listed on each county and town page with their sources.
Analysis: Nitrate in private wells, decade by decade, from the same public records.