Is Upper Lake County Water District Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Lake

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
MR	Monitoring	Resolved	2019-01-01 → 2019-12-31
MR	Monitoring	Resolved	2019-01-01 → 2019-12-31
MR	Monitoring	Resolved	2008-07-01
MR	Monitoring	Resolved	2008-07-01
MR	Monitoring	Resolved	1993-07-01 → 2003-12-31
Other	Monitoring	Archived	1989-02-01 → 1989-02-28
Other	Monitoring	Archived	1989-02-01 → 1989-02-28

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	520 µg/L 5.2% of the EPA limit 10000 µg/L	12/32	SYR4	2012–2018
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	11/11	LCR	2025
Barium	129.5 µg/L 6.5% of the EPA limit 2000 µg/L worst single sample: 130 µg/L	2/4	SYR4	2014–2017
Bromodichloromethane	1.13 µg/L No EPA limit set	1/8	SYR4	2012–2019
Bromoform	1.03 µg/L No EPA limit set	1/8	SYR4	2012–2019
Dibromochloromethane	1.4 µg/L No EPA limit set	1/8	SYR4	2012–2019
TTHM	3.56 µg/L 4.5% of the EPA limit 80 µg/L	1/8	SYR4	2012–2019

68 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, TotalArsenicAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: HENRY, RACHELLE
Phone: 707-275-3232
Email: [email protected]

Frequently asked questions about Upper Lake County Water District

Is Upper Lake County Water District tap water safe to drink?

EPA monitoring detected 7 contaminants in Upper Lake County 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 Upper Lake County Water District's water?

EPA monitoring detected Nitrate, Lead, Barium, Bromodichloromethane, Bromoform, and others. The full list with the level and data source for each is above.

How many people does Upper Lake County Water District serve?

Upper Lake County Water District reports serving 989 people in California, per its EPA record.

Has Upper Lake County Water District had any water quality violations?

The EPA has 7 violations on file for Upper Lake County Water District, of which 0 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.