Wyoming — At-Large
119th Congress · 195 ZIP codes · Avg score 55/100 · Grade C · Updated 2026-07-19
Data: EPA SDWIS / Census 119th Congress Last verified: 2026-07-19
ZipCheckup tracks water safety for 195 ZIP codes in Wyoming's At-Large: the district earns a grade C (55/100). 747 EPA violations on record, 134 health-based.
Top Contaminants
ZIP Codes in This District
100 ZIP codes tracked in Wyoming's At-Large. Showing top 50 by safety score.
| # | ZIP Code | City | Safety Score | Grade | Violations |
|---|---|---|---|---|---|
| 1 | 82730 | Upton | 83 | B | 0 |
| 2 | 82723 | Osage | 82 | B | 6 (1 health) |
| 3 | 82214 | Guernsey | 80 | B | 3 |
| 4 | 82213 | Glendo | 79 | B | 5 |
| 5 | 82201 | Wheatland | 78 | B | 7 (2 health) |
| 6 | 82215 | Hartville | 73 | B | 0 |
| 7 | 82210 | Chugwater | 72 | B | 3 (1 health) |
| 8 | 82701 | Newcastle | 72 | B | 8 |
| 9 | 82053 | Burns | 70 | B | 1 |
| 10 | 82244 | Yoder | 70 | B | 1 |
| 11 | 82435 | Powell | 70 | B | 0 |
| 12 | 82441 | Shell | 70 | B | 0 |
| 13 | 82515 | Hudson | 70 | B | 0 |
| 14 | 82732 | Wright | 70 | B | 1 |
| 15 | 83013 | Moran | 70 | B | 0 |
| 16 | 83025 | Teton Village | 70 | B | 1 |
| 17 | 82070 | Laramie | 69 | C | 2 |
| 18 | 82072 | Laramie | 69 | C | 2 |
| 19 | 82223 | Lingle | 69 | C | 2 |
| 20 | 82225 | Lusk | 69 | C | 2 |
| 21 | 82324 | Elk Mountain | 69 | C | 6 (1 health) |
| 22 | 82401 | Worland | 69 | C | 3 |
| 23 | 82410 | Basin | 69 | C | 6 (1 health) |
| 24 | 82520 | Lander | 69 | C | 3 (1 health) |
| 25 | 82637 | Glenrock | 69 | C | 1 (1 health) |
| 26 | 82639 | Kaycee | 69 | C | 2 |
| 27 | 82930 | Evanston | 69 | C | 4 (1 health) |
| 28 | 82935 | Green River | 69 | C | 3 |
| 29 | 82939 | Mountain View | 69 | C | 4 (1 health) |
| 30 | 83014 | Wilson | 69 | C | 7 (1 health) |
| 31 | 83120 | Freedom | 69 | C | 3 |
| 32 | 82442 | Ten Sleep | 68 | C | 2 |
| 33 | 82633 | Douglas | 68 | C | 0 |
| 34 | 82727 | Rozet | 68 | C | 4 |
| 35 | 82609 | Casper | 67 | C | 7 |
| 36 | 82636 | Evansville | 67 | C | 6 |
| 37 | 82644 | Mills | 67 | C | 6 (3 health) |
| 38 | 83127 | Thayne | 67 | C | 18 (3 health) |
| 39 | 82190 | Yellowstone National Park | 66 | C | 1 |
| 40 | 82212 | Fort Laramie | 66 | C | 1 |
| 41 | 82325 | Encampment | 66 | C | 1 |
| 42 | 82327 | Hanna | 66 | C | 0 |
| 43 | 82336 | Wamsutter | 66 | C | 0 |
| 44 | 82412 | Byron | 66 | C | 0 |
| 45 | 82421 | Deaver | 66 | C | 0 |
| 46 | 82426 | Greybull | 66 | C | 2 |
| 47 | 82428 | Hyattville | 66 | C | 1 |
| 48 | 82430 | Kirby | 66 | C | 1 |
| 49 | 82443 | Thermopolis | 66 | C | 5 |
| 50 | 82513 | Dubois | 66 | C | 3 (1 health) |
Overview
Wyoming's At-Large encompasses 195 ZIP codes tracked by ZipCheckup. The district's average Home Safety Score is C (55/100).
747 EPA violations have been recorded across this district's water systems. 134 are health-based violations. About 58% of tracked ZIP codes have at least one violation.
Top Contaminants
The most frequently cited water quality issues in this district:
- Consumer Confidence Report Rule - 149 violations
- Stage 1 DBP Rule - 123 violations
- Surface Water Treatment Rule - 105 violations
- Total Trihalomethanes (TTHM) - 54 violations
- E. coli - 50 violations
Housing Context
Homes in this district were built on average around 1976 (~50 years old). Older homes may have lead pipes or solder - consider a water filter if your home predates 1986.
Lead Alert: 1 ZIP code in this district exceed the EPA action level for lead. Consider using a certified lead-removal filter.
Data Sources
- Water quality violations: EPA Safe Drinking Water Information System (SDWIS)
- Congressional district boundaries: U.S. Census Bureau, 119th Congress
- Housing age: U.S. Census Bureau American Community Survey
Updated daily. Data covers 195 ZIP codes in Wyoming's At-Large.