Umatilla County Water Quality: 2 Cities Ranked by the Records
Umatilla County, Oregon: 2 city reports 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.
LithiumDetected in 1 system of 2 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest32 µg/L
- HERMISTON, CITY OF32 µg/LSample date: 2023-06-20 to 2024-03-11
- PENDLETON, CITY OFNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-05-28 to 2025-02-25
Perfluorooctanesulfonic acid (PFOS)Detected in 1 system of 2 tested4.0 ng/L federal MCL (2024) · US EPAHighest12 ng/L
- HERMISTON, CITY OF12 ng/LSample date: 2023-06-20 to 2024-06-10
- PENDLETON, CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-05-28 to 2025-02-25
Perfluorohexanesulfonic acid (PFHxS)Detected in 2 systems10 ng/L federal MCL (2024) · US EPAHighest12 ng/L
- HERMISTON, CITY OF12 ng/LSample date: 2023-06-20 to 2024-06-10
- PENDLETON, CITY OF4.8 ng/LSample date: 2024-05-28 to 2025-02-25
Lead (90th percentile)Detected in 2 systems15 µg/L federal action level · US EPAHighest3 µg/L
- PENDLETON, CITY OF3 µg/LMonitoring period: 2024–2026 (still open)
- HERMISTON, CITY OF2 µg/LMonitoring period: 2024–2026 (still open)
Perfluorobutanesulfonic acid (PFBS)Detected in 1 system of 2 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest10 ng/L
- HERMISTON, CITY OF10 ng/LSample date: 2023-06-20 to 2024-06-10
- PENDLETON, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-28 to 2025-02-25
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 2 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest3.9 ng/L
- HERMISTON, CITY OF3.9 ng/LSample date: 2023-06-20 to 2024-06-10
- PENDLETON, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-28 to 2025-02-25
Perfluoropentanoic acid (PFPeA)Detected in 1 system of 2 testedNo federal or state limit; shown for transparencyHighest4.2 ng/L
- HERMISTON, CITY OF4.2 ng/LSample date: 2023-06-20 to 2024-06-10
- PENDLETON, CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-28 to 2025-02-25
24 PFAS tested, none detected in any systemShow
Tested in these 2 systems: HERMISTON, CITY OF, PENDLETON, 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)
- Perfluoropentanesulfonic acid (PFPeS)
- 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 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 OregonLargest water systems
Frequently asked
How does Umatilla County tap water compare across cities?
PurityMap ranks 2 cities in Umatilla 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 Pendleton's main water system: PENDLETON, CITY OF · PWSID OR4100613 · Purity Score 88 (Good) · 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 Umatilla County cities had a PFAS sample above a 2024 EPA limit?
1 of 2 Umatilla County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Hermiston (PFOS 12 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 2.
Is there lead in Umatilla County tap water?
Utilities report lead as a 90th-percentile result from home taps. 2 of 2 Umatilla 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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