STATE REPORT WY HEALTH VIOLATIONS: 37

Wyoming Home Safety Profiles by ZIP

195 ZIP codes · 70 water systems · IPC plumbing code

Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData, NWS, State plumbing boards, Rewiring America

ZipCheckup tracks drinking-water and home-safety data for 195 ZIP codes across Wyoming, covering 70 public water systems that serve about 385,494 people. 36 ZIP codes are mapped to at least one water system with an EPA violation on record.

195
ZIP Codes
70
Water Systems
36
ZIPs with Violations
IPC
Plumbing Code
C · 63
Avg Safety Score
95%
EPA Radon Zone 1 (county-level potential)
#46
of 50 States
0%
ZIPs Rated A or B
75%
ZIPs with Violations
C
Wyoming average: 63/100 - ranked #46 of 50 states. 10 points below the national average (73). Water systems mapped to 75% of ZIP codes have recorded violations.

Wyoming: statewide composite grade under the B line.

Score Distribution

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

0
A
0
B
26
C
2
D
1
F
85-10070-8455-6940-540-39

Home Safety Scores by State

Loading map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

Model 4.0.0 inputs: EPA SDWIS, UCMR5 PFAS, EPA radon zones, annual county AQI •

Top 10 ZIP Codes by Home Safety Score in Wyoming

Highest Home Safety Scores in the state.

#ZIP CodeCityCountyScoreGrade
1 82401 WorlandWashakie 67 C
2 82435 PowellPark 67 C
3 82633 DouglasConverse 67 C
4 82801 SheridanSheridan 67 C
5 82943 RelianceSweetwater 67 C
6 82007 CheyenneLaramie 66 C
7 82070 LaramieAlbany 66 C
8 82072 LaramieAlbany 66 C
9 82414 CodyPark 66 C
10 82609 CasperNatrona 66 C

10 Lowest-Scoring ZIP Codes in Wyoming

#ZIP CodeCityCountyScoreGradeViolations
1 82501 RivertonFremont 36 F 88
2 82520 LanderFremont 49 D 1
3 82301 RawlinsCarbon 53 D 38
4 83116 DiamondvilleLincoln 60 C 10
5 83101 KemmererLincoln 60 C 10
6 82834 BuffaloJohnson 62 C 7
7 83001 JacksonTeton 63 C 196
8 82604 CasperNatrona 63 C 6
9 82001 CheyenneLaramie 63 C 8
10 82716 GilletteCampbell 64 C 7

County Rankings

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

Loading county map…
F (0-39) D (40-54) C (55-69) B (70-84) A (85+)

County-level aggregation of measured ZIP Home Safety Scores • EPA SDWIS, UCMR 5 PFAS, EPA radon zones, EPA AirData

CountyAvg ScoreGradeZIPsBest ZIPWorst ZIP
56001 66 C 11 82070 (66) 82072 (66)
56003 N/A N/A 12 N/A N/A
56005 65 C 7 82718 (66) 82716 (64)
56007 53 D 12 82301 (53) 82301 (53)
56009 67 C 3 82633 (67) 82633 (67)
56011 N/A N/A 7 N/A N/A
56013 43 D 13 82520 (49) 82501 (36)
56015 N/A N/A 9 N/A N/A
56017 N/A N/A 2 N/A N/A
56019 62 C 4 82834 (62) 82834 (62)
56021 65 C 17 82007 (66) 82001 (63)
56023 60 C 16 83101 (60) 83116 (60)
56025 65 C 14 82609 (66) 82604 (63)
56027 N/A N/A 5 N/A N/A
56029 67 C 7 82435 (67) 82414 (66)
56031 N/A N/A 5 N/A N/A
56033 67 C 12 82801 (67) 82801 (67)
56035 N/A N/A 6 N/A N/A
56037 66 C 12 82943 (67) 82935 (66)
56039 63 C 8 83001 (63) 83001 (63)
56041 66 C 7 82930 (66) 82930 (66)
56043 67 C 2 82401 (67) 82401 (67)
56045 N/A N/A 4 N/A N/A

Most Common Contaminants in Wyoming

Contaminant / RuleCategoryZIPs AffectedViolationsHealth Risk
Haloacetic Acids (HAA5) Disinfection Byproducts 15 45 Yes
Consumer Confidence Report Rule Reporting 12 18 Yes
Total Trihalomethanes (TTHM) Disinfection Byproducts 11 22 Yes
Stage 1 DBP Rule Treatment Technique 11 20 No
Surface Water Treatment Rule Treatment Technique 10 22 No
Contaminant 0700 Other 9 10 Yes
Revised Total Coliform Rule Microbiological 8 8 No
Arsenic Inorganic 6 12 No

Overview

We track multi-source home safety signals for 195 ZIP records across Wyoming. Home Safety Score model 4.0.0 is published for 29 scored records; missing required evidence suppresses the score.

The EPA snapshots used for this build directly map water systems to 48 ZIP records, covering 70 community water systems that serve approximately 385,494 people.

36 of 48 ZIP codes with a reported violation count in the available EPA record (75%) have recorded EPA violations. 37 health-based violations appear in the available health breakdown.

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 Home Safety Grade Violations Health-Based System
83001 Jackson C 196 1 Jackson, Town of
83014 Wilson — 188 0 Aspens Pines W&s District
82701 Newcastle — 162 0 City of Newcastle,
82501 Riverton F 88 5 City of Riverton,
82301 Rawlins D 38 4 City of Rawlins Water Supply,
83101 Kemmerer C 10 10 Kemmerer-diamondville Jpb
83116 Diamondville C 10 10 Kemmerer-diamondville Jpb
83121 Frontier — 10 10 Kemmerer-diamondville Jpb
82001 Cheyenne C 8 2 Cheyenne Board of Public Utilities
82716 Gillette C 7 1 City of Gillette,

Areas with No Violations

ZIP Code City Home Safety Grade System Population
82240 Torrington — City of Torrington Municipal Water Department, 6,847
82401 Worland C Worland Utilities Commission 4,787
82435 Powell C City of Powell, 6,310
82633 Douglas C City of Douglas, 6,400
82801 Sheridan C City of Sheridan, 22,700
82833 Big Horn — City of Sheridan, 22,700
82943 Reliance C City of Rock Springs, 24,000
83110 Afton — Afton, Board of Pub Utilities 2,000
83111 Auburn — Afton, Board of Pub Utilities 2,000
83119 Fairview — Afton, Board of Pub Utilities 2,000

Home Safety Score

Average Home Safety Score for Wyoming: C (63/100) across 29 scored of 195 tracked ZIP records.

Model 4.0.0 uses the canonical components water-compliance, pfas-mcl-screen, radon-zone, annual-aqi across 3 required domains. The sections below provide additional context and do not change that score. Missing required evidence suppresses the score, and a favorable result is not a property-level safety certification.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0033 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 48 ZIP codes with known status 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
82007 Cheyenne 76,273 C 4
82601 Casper 69,923 C 5
82001 Cheyenne 69,892 C 8
82604 Casper 68,890 C 6
82009 Cheyenne 64,240 C 2
82644 Mills 63,180 C 3
82609 Casper 61,873 C 2
82636 Evansville 61,873 — 2
82901 Rock Springs 38,735 C 3
82718 Gillette 37,187 C 2
82727 Rozet 36,160 C 2
82716 Gillette 34,246 C 7
82072 Laramie 33,080 C 1
82070 Laramie 32,395 C 1
83001 Jackson 27,320 C 196
82943 Reliance 27,000 C 0
83014 Wilson 26,530 — 188
82801 Sheridan 23,100 C 0
82833 Big Horn 22,700 — 0
82414 Cody 17,554 C 3

Lowest Published Home Safety Scores

ZIP Code City Score Grade Violations
82501 Riverton 36 F 88
82520 Lander 49 D 1
82301 Rawlins 53 D 38
83101 Kemmerer 60 C 10
83116 Diamondville 60 C 10

Highest Published Home Safety Scores

ZIP Code City Score Grade Violations
82401 Worland 67 C 0
82435 Powell 67 C 0
82633 Douglas 67 C 0
82801 Sheridan 67 C 0
82943 Reliance 67 C 0

All 195 ZIP Codes in Wyoming

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

Largest water systems in Wyoming

The 12 largest community water systems in Wyoming, out of 70 in our data.

Show all 12 water systems

Systems with the most violations in Wyoming

12 systems in Wyoming with the most recorded EPA violations.

Frequently Asked Questions

Is the water safe to drink in Wyoming?

Wyoming has 70 community water systems serving 385,494 people across 195 ZIP codes. There are 551 recorded violations among these water systems, including 37 health-based. 36 of 195 ZIP codes are mapped to at least one water system with a recorded violation.

What plumbing code does Wyoming follow?

Wyoming's listed plumbing code type is IPC as of our last review; local jurisdictions may adopt or amend codes. State rules allow homeowner plumbing work in some cases; check local permit and licensing rules before starting.

What is the radon risk in Wyoming?

95% of ZIP codes in Wyoming are mapped to counties classified as EPA Radon Zone 1 (highest county-level radon potential).

How to cite this page

APA ZipCheckup. (2026). Wyoming Home Safety Profiles by ZIP. https://zipcheckup.com/states/wyoming/
BibTeX 
@misc{zipcheckup-states-wyoming,
  author = {{ZipCheckup}},
  title  = {{Wyoming Home Safety Profiles by ZIP}},
  year   = {2026},
  url    = {https://zipcheckup.com/states/wyoming/}
}

Page version: October 2026.

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