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Tap water quality report

Yurok - Terwer Water

EPA monitoring tested this supplier for 72 contaminants and detected 6. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

72
contaminants tested
6
detected
300
people served
4
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Native American

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.

4
health-based violations
165
violations on file
3
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2002-01-01 → 2002-01-31
MCL Health-based Resolved 1999-10-01 → 1999-10-31
MCL Health-based Resolved 1999-09-01 → 1999-09-30
MCL Health-based Resolved 1999-03-01 → 1999-03-31
MR Monitoring Archived 2025-07-01 → 2025-12-31
MR Monitoring Unaddressed 2025-07-01
MR Monitoring Archived 2025-01-01 → 2025-12-31
MON Monitoring Resolved 2024-11-01 → 2024-11-30
MON Monitoring Resolved 2024-11-01 → 2024-11-30
MON Monitoring Resolved 2024-11-01 → 2024-11-30

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
Lead
0.0110 mg/L 73%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2025
Nitrate
810 µg/L 8.1%
of the EPA limit 10000 µg/L
 12/12 SYR4 2012–2019
Barium
15 µg/L 0.8%
of the EPA limit 2000 µg/L
 1/1 SYR4 2012
Copper
39 µg/L 3%
of the EPA limit 1300 µg/L
 1/2 SYR4 2012–2016
Gross Alpha, Excl. Radon And U
0.7177 pCi/L 4.8%
of the EPA limit 15 pCi/L
 1/1 SYR4 2017
Lead
1.6 µg/L 11%
of the EPA limit 15 µg/L
 1/2 SYR4 2012–2016
66 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalArsenicAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Joseph James
Phone
7074821350
Email
[email protected]

Frequently asked questions about Yurok - Terwer Water

Is Yurok - Terwer Water tap water safe to drink?

EPA monitoring detected 6 contaminants in Yurok - Terwer Water'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 Yurok - Terwer Water's water?

EPA monitoring detected Lead, Nitrate, Barium, Copper, Gross Alpha, Excl. Radon And U, and others. The full list with the level and data source for each is above.

How many people does Yurok - Terwer Water serve?

Yurok - Terwer Water reports serving 300 people in California, per its EPA record.

Has Yurok - Terwer Water had any water quality violations?

The EPA has 165 violations on file for Yurok - Terwer Water, of which 4 are health-based (a contaminant limit or required treatment was breached) and 3 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.