Is Cottonwood Water District Tap Water Safe? Quality Report

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

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
TT	Health-based	Resolved	2024-10-17
TT	Health-based	Resolved	2024-10-17
TT	Health-based	Resolved	2018-08-01
MCL	Health-based	Resolved	2004-05-01 → 2004-05-31
MCL	Health-based	Resolved	2004-05-01 → 2004-05-31
MCL	Health-based	Resolved	1995-12-01 → 1996-01-31
MCL	Health-based	Resolved	1995-12-01 → 1996-01-31
MR	Monitoring	Addressed	2025-10-01
RPT	Monitoring	Resolved	2024-10-17
RPT	Monitoring	Resolved	2024-10-17

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	1460 µg/L 15% of the EPA limit 10000 µg/L worst single sample: 1540 µg/L	44/60	SYR4	2012–2019
Lead	0.0011 mg/L 7.1% of the EPA limit 0.0150 mg/L	20/20	LCR	2022
Fluoride	138.5 µg/L 3.5% of the EPA limit 4000 µg/L worst single sample: 140 µg/L	4/5	SYR4	2016
Arsenic	9 µg/L 90% of the EPA limit 10 µg/L	1/5	SYR4	2016
Copper	94.4 µg/L 7.3% of the EPA limit 1300 µg/L	1/5	SYR4	2014

61 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosBariumBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChromiumDichloromethaneEthylbenzeneHfpo-DaMercuryNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: HOLLMER, JOHN
Phone: 530-347-3472
Email: cottonwoodwaterdistrict@gmail.com

Frequently asked questions about Cottonwood Water District

Is Cottonwood Water District tap water safe to drink?

EPA monitoring detected 5 contaminants in Cottonwood 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 Cottonwood Water District's water?

EPA monitoring detected Nitrate, Lead, Fluoride, Arsenic, Copper. The full list with the level and data source for each is above.

How many people does Cottonwood Water District serve?

Cottonwood Water District reports serving 3,316 people in California, per its EPA record.

Has Cottonwood Water District had any water quality violations?

The EPA has 12 violations on file for Cottonwood Water District, of which 7 are health-based (a contaminant limit or required treatment was breached) and 1 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.