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WaterSafeCheck
Official EPA SDWIS Statewide AnalysisState Water Quality & Testing Directory

Wyoming Drinking Water Quality & Testing Directory

Comprehensive EPA compliance records, water testing guidelines, and city rankings covering all 195 ZIP codes across Wyoming

Quick Summary: Is Tap Water Safe in Wyoming?

Drinking water in Wyoming receives an average composite safety score of 55.3/100 based on EPA Safe Drinking Water Act records. Approximately 0% of monitored ZIP codes earn an "A" grade. Water sources are 47.2% surface water and 52.8% groundwater, resulting in Hard to Very Hard mineral hardness across the state.

Total ZIP Codes

195

Health Violations (5yr)

134

Statewide Avg Score

55.3/100

High Lead Risk Areas

50.3%

Overview: Drinking Water in Wyoming

Drinking water quality in Wyoming averages a composite safety score of 55.3/100 across its 195 monitored ZIP codes. Approximately 0% of ZIP codes in the state receive an "A" grade, while 6% receive an "F" grade. Environmental standards are enforced by U.S. EPA Region 8 (Direct Implementation).

Surface Water

47.2%

of ZIP codes

Total Violations

747

5-year record

Grade A ZIPs

0

0% of state

Grade F ZIPs

11

6% of state

Water Quality Grade Distribution in Wyoming

How do Wyoming's 195 ZIP codes stack up by water quality grade?

A
0 ZIP codes0%
B
16 ZIP codes8%
C
96 ZIP codes49%
D
72 ZIP codes37%
F
11 ZIP codes6%

Popular Cities in Wyoming

Click any city to view ZIP code-level water quality reports

Cheyenne

8 ZIPs

F

Casper

5 ZIPs

C

Laramie

4 ZIPs

C

Gillette

3 ZIPs

C

Rock Springs

2 ZIPs

C

Evanston

2 ZIPs

C

Jackson

2 ZIPs

C

Fe Warren Afb

1 ZIP

D

Albin

1 ZIP

D

Bosler

1 ZIP

D

Buford

1 ZIP

D

Burns

1 ZIP

B

Carpenter

1 ZIP

C

Centennial

1 ZIP

C

Garrett

1 ZIP

D

Granite Canon

1 ZIP

D

Hillsdale

1 ZIP

D

Horse Creek

1 ZIP

D

Jelm

1 ZIP

D

Meriden

1 ZIP

D

Pine Bluffs

1 ZIP

C

Rock River

1 ZIP

C

Tie Siding

1 ZIP

D

Yellowstone National Park

1 ZIP

C

Wheatland

1 ZIP

B

Chugwater

1 ZIP

B

Fort Laramie

1 ZIP

C

Glendo

1 ZIP

B

Guernsey

1 ZIP

B

Hartville

1 ZIP

B

Hawk Springs

1 ZIP

D

Huntley

1 ZIP

D

Jay Em

1 ZIP

D

Lagrange

1 ZIP

D

Lance Creek

1 ZIP

F

Lingle

1 ZIP

C

Lost Springs

1 ZIP

D

Lusk

1 ZIP

C

Manville

1 ZIP

C

Shawnee

1 ZIP

D

City A-Z Directory — Wyoming

Browse water quality reports for every town and city in Wyoming.

A
AftonAladdinAlbinAlcovaAlpineAltaAlvaArapahoeArmintoArvadaAuburn
B
BaggsBairoilBannerBasinBedfordBeulahBig HornBig PineyBondurantBoslerBoulderBuffaloBufordBurlingtonBurnsByron
C
CarpenterCasperCentennialCheyenneChugwaterClearmontCodyCokevilleCoraCowleyCrowheart
D
DanielDaytonDeaverDevils TowerDiamondvilleDixonDouglasDubois
E
EdgertonElk MountainEmblemEncampmentEtnaEvanstonEvansville
F
FairviewFarsonFe Warren AfbFort BridgerFort LaramieFort WashakieFour CornersFrannieFreedomFrontier
G
GarrettGilletteGlendoGlenrockGrangerGranite CanonGreen RiverGreybullGroverGuernsey
H
HannaHartvilleHawk SpringsHilandHillsdaleHorse CreekHudsonHulettHuntleyHyattville
J
JacksonJay EmJeffrey CityJelm
K
KayceeKellyKemmererKinnearKirby
L
La BargeLagrangeLance CreekLanderLaramieLeiterLinchLingleLittle AmericaLonetreeLost SpringsLovellLuskLymanLysite
M
MandersonManvilleMc KinnonMedicine BowMeeteetseMeridenMidwestMillsMoorcroftMooseMoranMountain View
N
NatronaNewcastle
O
OpalOsageOtto
P
ParkmanPavillionPine BluffsPinedalePoint Of RocksPowder RiverPowell
R
RalstonRanchesterRawlinsRecluseRelianceRivertonRobertsonRock RiverRock SpringsRozet
S
SaddlestringSaint StephensSaratogaSaveryShawneeShellSheridanShirley BasinShoshoniSinclairSmootStorySundanceSuperior
T
Ten SleepTeton VillageThayneThermopolisTie SidingTorrington
U
Upton
V
Van TassellVeteran
W
WalcottWamsutterWapitiWestonWheatlandWilsonWolfWorlandWrightWyarno
Y
Yellowstone National ParkYoder

🏆 Highest Rated ZIP Codes in Wyoming

82730Upton
83/100
B
82723Osage
82/100
B
82214Guernsey
80/100
B
82213Glendo
79/100
B
82201Wheatland
78/100
B

⚠ Lowest Rated ZIP Codes in Wyoming

82222Lance Creek
13/100
F
82321Baggs
30/100
F
82002Cheyenne
32/100
F
82006Cheyenne
32/100
F
82008Cheyenne
32/100
F

Common Drinking Water Contaminants in Wyoming

The following are common regulated contaminants found in Wyoming drinking water based on EPA violation records. Click any contaminant to learn about EPA safety limits and health effects.

Contaminant 0700Contaminant 0800Stage 2 DBP RuleStage 1 DBP RuleHaloacetic Acids (HAA5)Consumer Confidence Report RuleTotal Trihalomethanes (TTHM)Fecal Coliform

Source: EPA Safe Drinking Water Act Maximum Contaminant Level regulations. For the complete list of regulated contaminants and MCLs, see the Water Quality Safety Guide.

Frequently Asked Questions — Wyoming Drinking Water

Is tap water generally safe to drink in Wyoming?+
Yes, for the majority of residents, tap water in Wyoming is treated and regulated. However, compliance varies by city. State-wide, 0 ZIP codes receive an "A" grade, while 11 receive an "F". Search your specific ZIP code to see your local utility's record.
How do I test water quality or well water in Wyoming?+
Residents in Wyoming can test their tap or well water by contacting laboratories certified by U.S. EPA Region 8 (Direct Implementation) or ordering an EPA-standard laboratory water testing kit. Annual testing is recommended for private wells to test for bacteria, nitrates, and heavy metals.
What are the biggest water quality issues in Wyoming?+
The primary issues include managing 134 health-based violations state-wide and resolving infrastructure age. 50.3% of ZIP codes in the state have a high probability of lead exposure risk due to pre-1986 piping.
Who regulates and enforces drinking water standards in Wyoming?+
Drinking water in Wyoming is regulated by U.S. EPA Region 8 (Direct Implementation) under a primacy agreement with the U.S. EPA.
Where does Wyoming get its drinking water?+
Approximately 47.2% of monitored areas in Wyoming rely on surface water sources (lakes/rivers), while the rest use groundwater aquifers.
How do I find the official water quality report for my home in Wyoming?+
Search your ZIP code on our site to view data compiled from EPA records, or contact your local utility for their annual Consumer Confidence Report (CCR).
View All 195 ZIP Codes in Wyoming

Browse EPA water quality data for every monitored ZIP code. For faster results, use the search bar above.

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All 195 ZIP codes in Wyoming are actively monitored under the EPA Safe Drinking Water Act.