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Big Valley Rancheria Water District

EPA monitoring tested this supplier for 71 contaminants and detected 5. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

71
contaminants tested
5
detected
417
people served
1
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.

1
health-based violations
3
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2004-05-01 → 2004-05-31
MR Monitoring Archived 2025-01-01 → 2025-12-31
MR Monitoring Resolved 2018-07-01 → 2018-12-31

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
0.0240 mg/L 160%
above the EPA limit of 0.0150 mg/L
 33/33 LCR 2025
TTHM
30.9225 µg/L 39%
of the EPA limit 80 µg/L
worst single sample: 30.97 µg/L
6/6 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
22.7 µg/L 38%
of the EPA limit 60 µg/L
worst single sample: 22.9 µg/L
6/6 SYR4 2014–2019
Bhc-Gamma
0.0100 µg/L 5%
of the EPA limit 0.2000 µg/L
 1/2 SYR4 2013
Barium
310 µg/L 16%
of the EPA limit 2000 µg/L
 1/1 SYR4 2013
66 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,4,5-TP2,4-DAntimony, TotalArsenicAsbestosAtrazineBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateGross Alpha, Excl. Radon And UHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNitrateNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
Flaman McCloud
Phone
7072633924
Email
[email protected]

Frequently asked questions about Big Valley Rancheria Water District

Is Big Valley Rancheria Water District tap water safe to drink?

EPA monitoring detected 5 contaminants in Big Valley Rancheria Water District'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 Big Valley Rancheria Water District's water?

EPA monitoring detected Lead, TTHM, Total Haloacetic Acids (HAA5), Bhc-Gamma, Barium. The full list with the level and data source for each is above.

How many people does Big Valley Rancheria Water District serve?

Big Valley Rancheria Water District reports serving 417 people in California, per its EPA record.

Has Big Valley Rancheria Water District had any water quality violations?

The EPA has 3 violations on file for Big Valley Rancheria Water District, of which 1 is 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.