Is Santa Rosa Reservation Tap Water Safe? Quality Report

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.

health-based violations

210

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	1998-02-01 → 1998-02-28
MCL	Health-based	Resolved	1998-01-01 → 1998-01-31
MCL	Health-based	Resolved	1997-06-01 → 1997-06-30
MCL	Health-based	Resolved	1996-08-01 → 1996-08-31
MR	Monitoring	Resolved	2022-10-01 → 2022-12-31
MR	Monitoring	Resolved	2021-04-01 → 2021-06-30
MR	Monitoring	Resolved	2021-01-01 → 2021-12-31
MR	Monitoring	Resolved	2021-01-01 → 2023-12-31
MR	Monitoring	Resolved	2021-01-01 → 2023-12-31
MR	Monitoring	Resolved	2020-07-01 → 2020-09-30

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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	850 µg/L 8.5% of the EPA limit 10000 µg/L	6/16	SYR4	2012–2019
Arsenic	12.3 µg/L 123% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 13 µg/L	5/9	SYR4	2017–2019
Lead	0.0100 mg/L 67% of the EPA limit 0.0150 mg/L	5/5	LCR	2025
Fluoride	1800 µg/L 45% of the EPA limit 4000 µg/L worst single sample: 1900 µg/L	3/3	SYR4	2017
Gross Alpha, Excl. Radon And U	2.81 pCi/L 19% of the EPA limit 15 pCi/L	1/1	SYR4	2017
TTHM	16 µg/L 20% of the EPA limit 80 µg/L	1/1	SYR4	2017

34 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalBariumBenzeneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideChromiumCombined Radium (-226 And -228)Combined UraniumDichloromethaneEthylbenzeneMercuryNitriteSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTotal Haloacetic Acids (HAA5)TrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: Steven Estrada
Phone: 9516592700
Email: sestrada@santarosa-nsn.gov

Frequently asked questions about Santa Rosa Reservation

Is Santa Rosa Reservation tap water safe to drink?

EPA monitoring detected 6 contaminants in Santa Rosa Reservation'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 Santa Rosa Reservation's water?

EPA monitoring detected Nitrate, Arsenic, Lead, Fluoride, 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 Santa Rosa Reservation serve?

Santa Rosa Reservation reports serving 185 people in California, per its EPA record.

Has Santa Rosa Reservation had any water quality violations?

The EPA has 210 violations on file for Santa Rosa Reservation, of which 4 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.