Sweetwater County Water Quality: 2 Cities Ranked by the Records

Name: Sweetwater County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Sweetwater County, Wyoming: 2 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Sweetwater County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 2 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest16 µg/L

ROCK SPRINGS, CITY OF16 µg/LSample date: 2023-01-25 to 2023-10-10
GREEN RIVER, CITY OF14 µg/LSample date: 2024-08-26 to 2025-05-13

Lead (90th percentile)Detected in 2 systems15 µg/L federal action level · US EPAHighest3 µg/L

ROCK SPRINGS, CITY OF3 µg/LMonitoring period: 2023–2025
GREEN RIVER, CITY OF2 µg/LMonitoring period: 2023–2025

29 PFAS tested, none detected in any systemShow

Tested in these 2 systems: GREEN RIVER, CITY OF, ROCK SPRINGS, CITY OF

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorobutanoic acid (PFBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

2 cities

Cities ranked by the records

1
Green RiverGREEN RIVER, CITY OF
No PFAS detectedLead below action level
Open city report →
2
Rock SpringsROCK SPRINGS, CITY OF
No PFAS detectedLead below action level
Open city report →

Showing 2 of 2 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Sweetwater CountyPFAS detected in 0 of 2 cities; none had a sample above a 2024 EPA limit

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Wyoming

Lead

0of 2 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Wyoming

Who supplies the county

Largest water systems

Rock SpringsROCK SPRINGS, CITY OF · WY5601182
24,000 served
Green RiverGREEN RIVER, CITY OF · WY5601181
10,500 served

Questions

Frequently asked

How does Sweetwater County tap water compare across cities?

PurityMap ranks 2 cities in Sweetwater County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Green River's main water system: GREEN RIVER, CITY OF · PWSID WY5601181 · Purity Score 98 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Sweetwater County cities had a PFAS sample above a 2024 EPA limit?

None of the 2 Sweetwater County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 0.

Is there lead in Sweetwater County tap water?

Utilities report lead as a 90th-percentile result from home taps. 2 of 2 Sweetwater County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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