County · Wyoming
Big Horn County, Wyoming: drinking water records
This overview covers 13 ZIP codes and 15 community water systems in Big Horn County. It also stands in for 2 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Lovell, Town of WY5600031 | 2,250 | 120 | 0 | 0 | 0 ppb |
| Cowley, Town of WY5600206 | 800 | 0 | 0 | 2 | 3 ppb |
| Burlington, Town of WY5601098 | 348 | 0 | 0 | 4 | 0 ppb |
| Manderson, Town of WY5600204 | 110 | 0 | 0 | 1 | 13 ppb |
| Greybull, Town of WY5600022 | 2,080 | 0 | 0 | 0 | 1 ppb |
| Basin, Town of WY5600004 | 1,250 | 0 | 0 | 0 | 3 ppb |
| South Big Horn County Jpb WY5601454 | 900 | 0 | 0 | 0 | 1 ppb |
| Byron, Town of WY5600008 | 561 | 0 | 0 | 0 | 0 ppb |
| Deaver Municipal Water System WY5600016 | 176 | 0 | 0 | 0 | 0 ppb |
| Frannie, Town of WY5600210 | 160 | 0 | 0 | 0 | 1 ppb |
| South End Water Users S&i District WY5600970 | 150 | 0 | 0 | 0 | 0 ppb |
| Shell Town Water Improvement District WY5600205 | 120 | 0 | 0 | 0 | 5 ppb |
| Greybull Heights Water Users WY5600230 | 84 | 0 | 0 | 0 | 2 ppb |
| Hyattville S&i District WY5600209 | 60 | 0 | 0 | 0 | 1 ppb |
| Scharen Subdivision WY5601666 | 50 | 0 | 0 | 0 | 3 ppb |
ZIP reports in Big Horn County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 82422, 82434.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.