Tap WaterIndex

← Oregon

Tap water quality report

Hermiston, City of

EPA monitoring tested this supplier for 91 contaminants and detected 16. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

91
contaminants tested
16
detected
20,000
people served
9
health-based violations
Oregon rankingsLead in OregonPFAS in Oregon
Water source
Surface water
Ownership
Local government
Counties served
Umatilla

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

9
health-based violations
166
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 1998-12-01 → 1998-12-31
MCL Health-based Resolved 1998-08-01 → 1998-08-31
MCL Health-based Resolved 1998-08-01 → 1998-08-31
TT Health-based Resolved 1996-09-01 → 1996-09-30
MCL Health-based Resolved 1994-07-01 → 1994-07-31
MCL Health-based Resolved 1993-08-01 → 1993-08-31
MCL Health-based Resolved 1993-03-01 → 1993-03-31
MCL Health-based Resolved 1992-11-01 → 1992-11-30
MCL Health-based Archived 1992-11-01 → 1992-11-30
MON Monitoring Resolved 2025-02-01 → 2025-02-28

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0100 µg/L 5/10 2024
PFHXS 0.0120 µg/L 5/10 2024
PFOS 0.0120 µg/L 5/10 2024
Pfhxa 0.0039 µg/L 1/11 2024
Pfpea 0.0042 µg/L 1/11 2024

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
TTHM
46.97 µg/L 59%
of the EPA limit 80 µg/L
worst single sample: 58.6 µg/L
140/140 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
49.525 µg/L 83%
of the EPA limit 60 µg/L
worst single sample: 72.7 µg/L
136/140 SYR4 2012–2019
Copper
296.15 µg/L 23%
of the EPA limit 1300 µg/L
worst single sample: 377 µg/L
44/73 SYR4 2014–2017
Lead
0.0030 mg/L 20%
of the EPA limit 0.0150 mg/L
 19/19 LCR 2023
Nitrate
6600 µg/L 66%
of the EPA limit 10000 µg/L
 16/82 SYR4 2012–2019
Lead
11.5 µg/L 77%
of the EPA limit 15 µg/L
worst single sample: 14 µg/L
6/73 SYR4 2014–2017
Lithium
32 µg/L
No EPA limit set
 5/11 UCMR-5 2024
Combined Uranium
7.286 µg/L 24%
of the EPA limit 30 µg/L
worst single sample: 7.29 µg/L
2/6 SYR4 2015–2018
Gross Alpha, Excl. Radon And U
7.2125 pCi/L 48%
of the EPA limit 15 pCi/L
worst single sample: 7.46 pCi/L
2/6 SYR4 2015–2018
Arsenic
9 µg/L 90%
of the EPA limit 10 µg/L
 1/6 SYR4 2012–2014
Xylenes, Total
0.6600 µg/L 0%
of the EPA limit 10000 µg/L
 1/20 SYR4 2012–2019
75 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPFOAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
HERMISTON, CITY OF
Phone
541-567-5521
Email
[email protected]

Frequently asked questions about Hermiston, City of

Is Hermiston, City of tap water safe to drink?

EPA monitoring detected 16 contaminants in Hermiston, City of's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Hermiston, City of's water?

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Copper, Lead, Nitrate, and others. The full list with the level and data source for each is above.

How many people does Hermiston, City of serve?

Hermiston, City of reports serving 20,000 people in Oregon, per its EPA record.

Has Hermiston, City of had any water quality violations?

The EPA has 166 violations on file for Hermiston, City of, of which 9 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.