Wyoming

Water quality data from the EPA Safe Drinking Water Information System

Lead Risk: Caution

Water Systems

1,877

Active public water systems

Population Served

638.4K

Residents with piped water

Lead Violations

Systems exceeding 15 ppb

Copper Violations

Lead & Copper Rule

Average Lead Level

2.34 ppb

EPA Action Level: 15 ppb

MCLG (health goal): 0 ppb

0 ppbAction Level: 15 ppb

Average across 484 systems with reported lead data.

Violations Detected

51 water systems in Wyoming have reported violations under the Lead and Copper Rule. These utilities are required to notify customers and take corrective action.

6 lead violations45 copper violations

Water Systems: Highest Lead Levels

System Name	City	Population	Lead Level	Status	Sample Date
CHEYENNE BOARD OF PUBLIC UTILITIES	CHEYENNE	64,165	15.00 ppb	OK	2025-12-31
SOUTH CHEYENNE WATER & SEWER DISTRICT	CHEYENNE	10,000	6.00 ppb	OK	2023-12-31
GILLETTE, CITY OF	GILLETTE	32,222	4.00 ppb	OK	2025-12-31
RIVERTON, CITY OF	RIVERTON	10,330	4.00 ppb	OK	2023-12-31
ROCK SPRINGS, CITY OF	ROCK SPRINGS	24,000	3.00 ppb	OK	2025-12-31
GREEN RIVER, CITY OF	GREEN RIVER	10,500	2.00 ppb	OK	2025-12-31
LARAMIE, CITY OF	LARAMIE	32,395	1.28 ppb	OK	2024-12-31
CASPER, CITY OF	CASPER	59,000	1.00 ppb	OK	2023-12-31
JACKSON, TOWN OF	JACKSON	24,760	1.00 ppb	OK	2025-12-31
EVANSTON, CITY OF	EVANSTON	12,000	0.73 ppb	OK	2025-12-31
SHERIDAN, CITY OF	SHERIDAN	22,700	0.00 ppb	OK	2023-12-31
CODY, CITY OF	CODY	10,224	0.00 ppb	OK	2025-12-31

Showing top 12 of 471 systems with lead data. Action level: 15 ppb.

Systems With Active Violations

These water systems have exceeded EPA limits and must take corrective action.

JACKSON, TOWN OF

JACKSON · Pop. 24,760

Copper

Lead: 1.00 ppb (2025-12-31)

Water Source Types

Groundwater1423 (78%)

Purchased Surface Water183 (10%)

Purchased Groundwater95 (5%)

Surface Water93 (5%)

Groundwater Under Influence of SW25 (1%)

Unknown6 (0%)

Purchased GW Under Influence of SW1 (0%)

Resources

EPA Water Data Reports

Official drinking water data and reports

Lead in Drinking Water

EPA guidance on lead risks and remediation

Learn About Lead Contamination

Health effects, filtering options, and more

Air Quality

Good

Avg AQI

40.5

PM2.5

6.2 µg/m³

Unhealthy Days

Primary Pollutant

Wildfire smoke (seasonal)

AQI 0 (Good)AQI 100 (Moderate)200+

Source: EPA AirNow & American Lung Association 2024 State of the Air. AQI scale: 0–50 Good · 51–100 Moderate · 101–150 Sensitive Groups · 151+ Unhealthy.

PFAS Contamination

Moderate Detection

PFAS (per- and polyfluoroalkyl substances), known as “forever chemicals,” are a group of synthetic chemicals that persist indefinitely in the environment and human body. The EPA set a maximum contaminant level (MCL) of 4 parts per trillion (ppt) for PFOA and PFOS in April 2024. View national PFAS tracker →

Systems Tested

PFAS Detected

Detection Rate

29.0%

Exceeding MCL (4 ppt)

2(3.2%)

0%Detection rate: 29.0%100%

Highest recorded level: 8 ppt (EPA MCL: 4 ppt). F.E. Warren AFB contamination documented

Data source:EPA Safe Drinking Water Information System (SDWIS), Lead and Copper Rule monitoring data. Lead levels represent 90th percentile results from the most recent monitoring period. Violations indicate exceedances of EPA action levels requiring corrective action. This tool is for informational purposes only and does not replace your utility's official Consumer Confidence Report.