Drinking water quality · 2023
· Verified
What's in Santa Rosa, City of, CA tap water
14 contaminants were measured in the Santa Rosa, City of, CA water system's 2023 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2023
- Contaminants measured
- 14
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- Manganese
- Service area
- CA
PFAS — EPA UCMR5 (2023–2025)
1 PFAS compound detected in Santa Rosa, City of, CA
The EPA finalized the first-ever federal drinking-water limits for six PFAS compounds in April 2024. These numbers come straight from EPA's UCMR5 lab dataset — every U.S. system serving more than 3,300 people tested every PFAS sample at an entry point to its distribution system. PFAS not listed below were either tested and not detected, or not yet sampled.
Lithium
● Detected (no federal limit)above national p90 (76.59999999999991 mg/L across detecting U.S. systems)
Where your water comes from · EPA SDWIS
Santa Rosa, City of, CA's drinking water comes from ground water, drawn from 5 sources.
Source
- FARMERS LN. · 2
- CARLEY WELL - STANDBY
- PETER SPRING WELL - STANDBY
- LEETE WELL - STANDBY-TEMP OFFLINE
Treatment
- TREATMENT PLNT-FARMERS LN WELLS 01&02
- TREATMENT PLANT - LEETE WELL - STANDBY
- TREATMENT PLANT - CARLEY WELL - STANDBY
- + 1 more
Distribution
Also buys water from SONOMA COUNTY WATER AGENCY.
Historical readings · EPA Six-Year Review (2012–2019)
1 contaminant historically over EPA limits in Santa Rosa, City of, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
GROSS BETA worst: 2014 | 7.42 mrem/yr 1.9× | 4 mrem/yr | '14'15 |
TTHM worst: 2015 | 0.0487 mg/L within | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
ARSENIC worst: 2014 | 0.0037 mg/L within below national p90 | 0.01 mg/L | '14'18 |
HAA5 worst: 2014 | 0.0168 mg/L within | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
FLUORIDE worst: 2014 | 0.25 mg/L within | 4 mg/L | '12'14'15 |
BARIUM worst: 2012 | 0.0648 mg/L within below national p90 | 2 mg/L | '12'14'15 |
CHROMIUM worst: 2015 | 0.00062 mg/L within below national p90 | 0.1 mg/L | '15 |
COPPER worst: 2014 | 0.00056 mg/L below national p90 | — | '14'15'18 |
DBAA worst: 2012 | 0.0024 mg/L | — | '12'13'14'15'16'17'18'19 |
DCAA worst: 2012 | 0.006 mg/L | — | '12'13'14'15'16'17'18'19 |
TCAA worst: 2012 | 0.0056 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMODICHLOROMETHANE worst: 2012 | 0.00819 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.00157 mg/L | — | '12'13'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.0131 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.00696 mg/L | — | '12'13'14'15'16'17'18'19 |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ManganeseA naturally occurring metal from soil and rock. | 74.75 UG/LAverageSource water | 50 UG/LMCL | At or above the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits. | Not detected MG/LHighest single sampleSource water | 10 MG/LMCL | None detected |
Other
VOCs & pesticides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| 1,2,3-TCP | Not detected UG/LHighest single sampleSource water | 0.005 UG/LMCL | None detected |
People also ask about Santa Rosa, City of, CA's water
+Is Santa Rosa, City of, CA tap water safe to drink in 2023?
The 2023 Consumer Confidence Report for the Santa Rosa, City of, CA water utility lists 1 contaminant at or above the federal limit: Manganese. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Santa Rosa, City of, CA tap water?
14 contaminants were measured in Santa Rosa, City of, CA's 2023 Consumer Confidence Report, spanning disinfection byproducts, other, and inorganic chemicals. 5 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Santa Rosa, City of, CA tap water?
One contaminant in Santa Rosa, City of, CA's 2023 report sits at or above the federal limit: Manganese (1.5× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Santa Rosa, City of, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2023 report is Manganese, at 1.5× the federal threshold. It belongs to the metals family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Santa Rosa, City of, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Santa Rosa, City of, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2023 report; a new report will replace it once the utility publishes its next annual update.