Grant County Water Quality
Grant County, Washington: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
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.
Perfluorooctanesulfonic acid (PFOS)MOSES LAKE CITY OF4.0 ng/L federal MCL (2024) · US EPA52.2 ng/L
- MOSES LAKE CITY OF52.2 ng/LSample date: 2023-08-23 to 2025-01-16
Perfluorohexanesulfonic acid (PFHxS)MOSES LAKE CITY OF10 ng/L federal MCL (2024) · US EPA54.1 ng/L
- MOSES LAKE CITY OF54.1 ng/LSample date: 2023-08-23 to 2025-01-16
LithiumMOSES LAKE CITY OF10 µg/L EPA health reference level (screening, not a legal limit) · US EPA35.6 µg/L
- MOSES LAKE CITY OF35.6 µg/LSample date: 2023-08-23 to 2025-01-16
Lead (90th percentile)MOSES LAKE CITY OF15 µg/L federal action level · US EPA3.2 µg/L
- MOSES LAKE CITY OF3.2 µg/LMonitoring period: 2021–2023
Perfluorobutanesulfonic acid (PFBS)MOSES LAKE CITY OF2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPA4.4 ng/L
- MOSES LAKE CITY OF4.4 ng/LSample date: 2023-08-23 to 2025-01-16
Perfluorohexanoic acid (PFHxA)MOSES LAKE CITY OF400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLE7.3 ng/L
- MOSES LAKE CITY OF7.3 ng/LSample date: 2023-08-23 to 2025-01-16
Perfluoropentanesulfonic acid (PFPeS)MOSES LAKE CITY OFNo federal or state limit; shown for transparency5.3 ng/L
- MOSES LAKE CITY OF5.3 ng/LSample date: 2023-08-23 to 2025-01-16
24 PFAS tested, none detected in this systemShow
Tested in this system: MOSES LAKE 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)
- Perfluorobutanoic acid (PFBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanoic acid (PFPeA)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
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.
0of 1 city 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 WashingtonLargest water systems
- Moses LakeMOSES LAKE CITY OF · WA535630032,428 served
Frequently asked
How does Grant County tap water compare across cities?
PurityMap ranks 1 city in Grant 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 Moses Lake's main water system: MOSES LAKE CITY OF · PWSID WA5356300 · Purity Score 53 (Poor) · 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 Grant County cities had a PFAS sample above a 2024 EPA limit?
1 of 1 Grant County city report had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Moses Lake (PFOS 52.2 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 1.
Is there lead in Grant County tap water?
Utilities report lead as a 90th-percentile result from home taps. 1 of 1 Grant 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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