Compliance record
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 |
|---|---|---|---|---|
| Dichloroacetic Acid | 5.4 µg/L No EPA limit set
worst single sample: 7.4 µg/L | 81/81 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 11 µg/L 18% of the EPA limit 60 µg/L
worst single sample: 16.8 µg/L | 81/81 | SYR4 | 2012–2019 |
| Bromodichloromethane | 10.73 µg/L No EPA limit set
worst single sample: 13.1 µg/L | 79/81 | SYR4 | 2012–2019 |
| Dibromochloromethane | 8.625 µg/L No EPA limit set
worst single sample: 11.9 µg/L | 79/81 | SYR4 | 2012–2019 |
| TTHM | 36.54 µg/L 46% of the EPA limit 80 µg/L
worst single sample: 48.7 µg/L | 79/81 | SYR4 | 2012–2019 |
| Chloroform | 20.415 µg/L No EPA limit set
worst single sample: 24.6 µg/L | 78/80 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 5.81 µg/L No EPA limit set
worst single sample: 9.9 µg/L | 67/81 | SYR4 | 2012–2019 |
| Bromoform | 2.35 µg/L No EPA limit set
worst single sample: 3.16 µg/L | 66/79 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 3.12 µg/L No EPA limit set
worst single sample: 3.6 µg/L | 50/81 | SYR4 | 2012–2019 |
| Lead | 0.0013 mg/L 8.8% of the EPA limit 0.0150 mg/L | 42/42 | LCR | 2025 |
| Barium | 62.34 µg/L 3.1% of the EPA limit 2000 µg/L
worst single sample: 64.8 µg/L | 7/9 | SYR4 | 2012–2015 |
| Fluoride | 244 µg/L 6.1% of the EPA limit 4000 µg/L
worst single sample: 250 µg/L | 7/7 | SYR4 | 2012–2015 |
| Arsenic | 3.68 µg/L 37% of the EPA limit 10 µg/L
worst single sample: 3.7 µg/L | 5/13 | SYR4 | 2012–2018 |
| Copper | 1.98 µg/L 0.2% of the EPA limit 1300 µg/L
worst single sample: 2.2 µg/L | 5/11 | SYR4 | 2012–2018 |
| Gross Beta Particle Activity | 7.189 pCi/L No EPA limit set
worst single sample: 7.42 pCi/L | 4/4 | SYR4 | 2014–2015 |
| Lithium | 96 µg/L No EPA limit set | 2/4 | UCMR-5 | 2024 |
| Chromium | 0.6200 µg/L 0.6% of the EPA limit 100 µg/L | 1/9 | SYR4 | 2012–2015 |
93 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitrateNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Santa Rosa, City of
Is Santa Rosa, City of tap water safe to drink?
EPA monitoring detected 17 contaminants in Santa Rosa, City of'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, City of's water?
EPA monitoring detected Dichloroacetic Acid, Total Haloacetic Acids (HAA5), Bromodichloromethane, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.
How many people does Santa Rosa, City of serve?
Santa Rosa, City of reports serving 175,396 people in California, per its EPA record.
Has Santa Rosa, City of had any water quality violations?
The EPA has no formal drinking-water violations on file for Santa Rosa, City of.
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.