STATE REPORT WY 134 HEALTH VIOLATIONS

Wyoming Water Quality: 747 Violations in 195 ZIP Codes

195 ZIP codes · 209 water systems · IPC plumbing code · Updated 2026-06-04

Data: EPA SDWIS, NWS, State plumbing boards, Rewiring America Last verified: 2026-06-04

195
ZIP Codes
209
Water Systems
113
ZIPs with Violations
IPC
Plumbing Code
C · 55
Avg Safety Score
1
ZIPs Exceeding Lead Limit
95%
High Radon Risk (Zone 1)
#51
of 51 States
8%
ZIPs Rated A or B
58%
ZIPs with Violations
C
Wyoming average: 55/100 — ranked #51 of 51 states. 12 points below the national average (67). 58% of ZIP codes have recorded violations.

Compared to better-performing states, Wyoming public water systems record elevated violation rates — health-based exceedances appear in multiple regions, compliance gaps have persisted across recent monitoring cycles, and the state's aggregate safety grade sits well below the national median.

Score Distribution

How Wyoming's 195 ZIP codes are distributed across safety grades.

0
A
16
B
96
C
72
D
11
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

Data: EPA SDWIS, FEMA NFIP, EPA Radon, USGS Earthquake Hazards, NIFC Wildfire • 2026-06-04

Top 10 Safest ZIP Codes in Wyoming

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 82730 UptonWeston 83 B
2 82723 OsageWeston 82 B
3 82214 GuernseyPlatte 80 B
4 82213 GlendoPlatte 79 B
5 82201 WheatlandPlatte 78 B
6 82215 HartvillePlatte 73 B
7 82210 ChugwaterPlatte 72 B
8 82701 NewcastleWeston 72 B
9 82053 BurnsLaramie 70 B
10 82244 YoderGoshen 70 B

10 Lowest-Scoring ZIP Codes in Wyoming

#ZIP CodeCityCountyScoreGradeViolations
1 82222 Lance CreekNiobrara 13 F 18
2 82321 BaggsCarbon 30 F 17
3 82329 Medicine BowCarbon 32 F 2
4 82010 CheyenneLaramie 32 F 6
5 82008 CheyenneLaramie 32 F 6
6 82006 CheyenneLaramie 32 F 6
7 82002 CheyenneLaramie 32 F 6
8 82009 CheyenneLaramie 34 F 6
9 82001 CheyenneLaramie 34 F 6
10 83101 KemmererLincoln 36 F 34

County Rankings

Water quality breakdown by county. 23 counties with data in Wyoming.

Loading county map…
F (0-49) D (50-64) C (65-74) B (75-84) A (85+)

County-level aggregation of ZIP code safety scores • EPA SDWIS, FEMA NFIP, EPA Radon, USGS, NIFC

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
Laramie 43 D 17 82053 (70) 82010 (32)
Albany 54 D 11 82070 (69) 82084 (40)
Carbon 51 D 13 82324 (69) 82321 (30)
Park 60 C 7 82435 (70) 82440 (40)
Platte 73 B 6 82214 (80) 82219 (53)
Goshen 54 D 7 82244 (70) 82243 (40)
Niobrara 44 D 6 82225 (69) 82222 (13)
Fremont 51 D 15 82515 (70) 82642 (40)
Sweetwater 61 C 11 82935 (69) 82943 (40)
Washakie 69 C 2 82401 (69) 82442 (68)
Big Horn 60 C 12 82441 (70) 82434 (40)
Hot Springs 66 C 2 82430 (66) 82443 (66)
Natrona 57 C 13 82609 (67) 82648 (40)
Converse 69 C 2 82637 (69) 82633 (68)
Johnson 57 C 3 82639 (69) 82840 (40)
Weston 73 B 4 82730 (83) 82715 (53)
Crook 51 D 7 82720 (66) 82714 (40)
Campbell 62 C 6 82732 (70) 82731 (40)
Sheridan 48 D 13 82835 (66) 82845 (40)
Teton 62 C 9 83013 (70) 83011 (40)
Sublette 49 D 5 82941 (63) 83115 (40)
Uinta 55 C 8 82930 (69) 82944 (40)
Lincoln 58 C 16 83120 (69) 83101 (36)

Most Common Contaminants in Wyoming

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Stage 1 DBP Rule Treatment Technique 60 123 Yes
Consumer Confidence Report Rule Reporting 55 149 Yes
Surface Water Treatment Rule Treatment Technique 51 105 No
Contaminant 0700 Other 34 46 Yes
Total Trihalomethanes (TTHM) Disinfection Byproducts 32 54 Yes
E. coli Microbiological 24 50 Yes
Revised Total Coliform Rule Microbiological 22 41 No
Arsenic Inorganic 21 30 No

Overview

We track water quality, weather alerts, plumbing regulations, and energy rebates for 195 ZIP codes across Wyoming, covering 209 community water systems that serve approximately 434,647 people.

113 of 195 ZIP codes (58%) have recorded EPA violations. 134 health-based violations have been documented.

Plumbing Regulations

Wyoming follows the International Plumbing Code (2018 edition).

  • Plumbing code: IPC (2018)
  • Homeowner DIY: Allowed with permit
  • Water heater permit: Required
  • Annual backflow test: Required

Full Wyoming regulations →

Areas with Most Violations

ZIP Code City Safety Score Violations Health-Based System
83113 Big Piney C 79 1 Big Piney, Town of
83101 Kemmerer F 34 6 Kemmerer-diamondville Jpb
83122 Grover C 27 5 Afton, Board of Pub Utilities
82501 Riverton D 26 7 City of Riverton,
82050 Albin D 22 2 Albin, Town of
82222 Lance Creek F 18 12 Lance Creek Water District
83127 Thayne C 18 3 Bedford Water & Sewer District
82321 Baggs F 17 10 Baggs, Town of
82945 Superior C 17 2 Superior, Town of
82323 Dixon D 16 13 Dixon, Town of

Areas with No Violations

ZIP Code City Safety Score System Population
82005 Fe Warren Afb D Usaf F.e. Warren Afb 5,500
82051 Bosler D LARAMIE, CITY OF 32,395
82052 Buford D LARAMIE, CITY OF 32,395
82058 Garrett D MEDICINE BOW, TOWN OF 189
82059 Granite Canon D CHEYENNE BOARD OF PUBLIC UTILITIES 64,165
82060 Hillsdale D CHEYENNE BOARD OF PUBLIC UTILITIES 64,165
82061 Horse Creek D LARAMIE, CITY OF 32,395
82063 Jelm D CENTENNIAL WATER AND SEWER DISTRICT 150
82081 Meriden D ALBIN, TOWN OF 181
82084 Tie Siding D LARAMIE, CITY OF 32,395

Home Safety Score

Average Home Safety Score for Wyoming: C (55/100)

Lead & Copper

  • Average lead level (90th percentile): 0.0038 mg/L (EPA action level: 0.015 mg/L)
  • 1 ZIP code exceed the EPA lead action level

Radon Risk

  • High risk (Zone 1): 185 ZIP codes (95%)
  • Moderate risk (Zone 2): 10 ZIP codes
  • Low risk (Zone 3): 0 ZIP codes

ZIP Code Reports for Wyoming

Largest Communities

ZIP Code City Population Safety Grade Violations
82001 Cheyenne 81,406 F 6
82002 Cheyenne 81,406 F 6
82003 Cheyenne 81,406 D 6
82006 Cheyenne 81,406 F 6
82007 Cheyenne 81,406 F 6
82008 Cheyenne 81,406 F 6
82009 Cheyenne 81,406 F 6
82010 Cheyenne 81,406 F 6
82601 Casper 73,253 C 7
82604 Casper 73,253 C 7
82005 Fe Warren Afb 69,665 D 0
82644 Mills 68,986 C 6
82602 Casper 65,203 C 7
82605 Casper 65,203 C 7
82609 Casper 65,203 C 7
82059 Granite Canon 64,165 D 0
82060 Hillsdale 64,165 D 0
82636 Evansville 61,853 C 6
82620 Alcova 59,000 D 0
82646 Natrona 59,000 D 0

Lowest Safety Scores

ZIP Code City Score Grade Violations
82222 Lance Creek 13 F 18
82321 Baggs 30 F 17
82002 Cheyenne 32 F 6
82006 Cheyenne 32 F 6
82008 Cheyenne 32 F 6

Highest Safety Scores

ZIP Code City Score Grade Violations
82730 Upton 83 B 0
82723 Osage 82 B 6
82214 Guernsey 80 B 3
82213 Glendo 79 B 5
82201 Wheatland 78 B 7

All 195 ZIP Codes in Wyoming

Data Sources

Updated daily.

Frequently Asked Questions

Is the water safe to drink in Wyoming?

Wyoming has 209 community water systems serving 434,647 people across 195 ZIP codes. There are 747 recorded violations, including 134 health-based. 113 of 195 ZIP codes have at least one violation.

What plumbing code does Wyoming follow?

Wyoming follows the IPC plumbing code. DIY plumbing work is allowed for homeowners.

Is lead a concern in Wyoming's drinking water?

1 ZIP code in Wyoming has lead levels exceeding the EPA action level of 0.015 mg/L.

What is the radon risk in Wyoming?

95% of ZIP codes in Wyoming fall in EPA Radon Zone 1 (highest risk).

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