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.
12
health-based violations
12
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2002-09-01 → 2002-09-30 |
| MCL | Health-based | Resolved | 2002-09-01 → 2002-09-30 |
| MCL | Health-based | Resolved | 1998-12-01 → 1998-12-31 |
| MCL | Health-based | Resolved | 1998-12-01 → 1998-12-31 |
| MCL | Health-based | Resolved | 1992-11-01 → 1992-12-31 |
| MCL | Health-based | Resolved | 1992-11-01 → 1992-12-31 |
| MCL | Health-based | Resolved | 1992-11-01 → 1992-12-31 |
| MCL | Health-based | Resolved | 1992-10-01 → 1992-11-30 |
| MCL | Health-based | Resolved | 1992-10-01 → 1992-11-30 |
| MCL | Health-based | Resolved | 1992-09-01 → 1992-10-31 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
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 | 6752.88 µg/L 68% of the EPA limit 10000 µg/L
worst single sample: 13542.4 µg/L | 1916/1984 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 152 µg/L 3040% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 400 µg/L | 697/1711 | SYR4 | 2012–2019 |
| cis-1,2-Dichloroethylene | 6.081 µg/L 8.7% of the EPA limit 70 µg/L
worst single sample: 9.1 µg/L | 230/1711 | SYR4 | 2012–2019 |
| TTHM | 3.14 µg/L 3.9% of the EPA limit 80 µg/L
worst single sample: 11.8 µg/L | 73/671 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 5235 µg/L 52% of the EPA limit 10000 µg/L
worst single sample: 6900 µg/L | 54/60 | SYR4 | 2016–2019 |
| Chloroform | 1.94 µg/L No EPA limit set
worst single sample: 4.55 µg/L | 41/671 | SYR4 | 2012–2019 |
| Styrene | 1.575 µg/L 1.6% of the EPA limit 100 µg/L
worst single sample: 1.9 µg/L | 26/1711 | SYR4 | 2012–2019 |
| Bromodichloromethane | 1.388 µg/L No EPA limit set
worst single sample: 3.08 µg/L | 23/671 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 23/23 | LCR | 2023 |
| Dibromochloromethane | 1.483 µg/L No EPA limit set
worst single sample: 2.75 µg/L | 15/672 | SYR4 | 2012–2019 |
| Trichloroethylene | 1.175 µg/L 24% of the EPA limit 5 µg/L
worst single sample: 1.18 µg/L | 11/1711 | SYR4 | 2012–2019 |
| Combined Uranium | 0.8988 µg/L 3% of the EPA limit 30 µg/L
worst single sample: 1.07578 µg/L | 7/14 | SYR4 | 2014–2018 |
| Arsenic | 2.1664 µg/L 22% of the EPA limit 10 µg/L
worst single sample: 2.5 µg/L | 5/164 | SYR4 | 2012–2019 |
| Xylenes, Total | 8.5 µg/L 0.1% of the EPA limit 10000 µg/L
worst single sample: 9.4 µg/L | 5/1700 | SYR4 | 2012–2019 |
| Barium | 40.2556 µg/L 2% of the EPA limit 2000 µg/L
worst single sample: 42.42 µg/L | 4/163 | SYR4 | 2012–2019 |
| Fluoride | 108.5 µg/L 2.7% of the EPA limit 4000 µg/L
worst single sample: 110 µg/L | 4/160 | SYR4 | 2012–2019 |
| Antimony, Total | 0.0205 µg/L 0.3% of the EPA limit 6 µg/L
worst single sample: 0.0210 µg/L | 3/163 | SYR4 | 2012–2019 |
| Copper | 0.9310 µg/L 0.1% of the EPA limit 1300 µg/L
worst single sample: 0.9590 µg/L | 3/174 | SYR4 | 2012–2019 |
| Chromium | 11.8 µg/L 12% of the EPA limit 100 µg/L
worst single sample: 12 µg/L | 3/161 | SYR4 | 2012–2019 |
| Lead | 0.0888 µg/L 0.6% of the EPA limit 15 µg/L
worst single sample: 0.0930 µg/L | 3/163 | SYR4 | 2012–2019 |
| Toluene | 2.13 µg/L 0.2% of the EPA limit 1000 µg/L
worst single sample: 2.2 µg/L | 3/1711 | SYR4 | 2012–2019 |
| Lithium | 11.7 µg/L No EPA limit set | 3/74 | UCMR-5 | 2024 |
| 1,1-Dichloroethylene | 0.5780 µg/L 8.3% of the EPA limit 7 µg/L
worst single sample: 0.5800 µg/L | 2/1711 | SYR4 | 2012–2019 |
| Cadmium | 0.0115 µg/L 0.2% of the EPA limit 5 µg/L
worst single sample: 0.0120 µg/L | 2/163 | SYR4 | 2012–2019 |
| Ethylbenzene | 1.1705 µg/L 0.2% of the EPA limit 700 µg/L
worst single sample: 1.2 µg/L | 2/1711 | SYR4 | 2012–2019 |
| Selenium | 0.2114 µg/L 0.4% of the EPA limit 50 µg/L
worst single sample: 0.2170 µg/L | 2/162 | SYR4 | 2012–2019 |
| Beryllium, Total | 0.0020 µg/L 0.1% of the EPA limit 4 µg/L | 1/162 | SYR4 | 2012–2019 |
| Bromoform | 1.27 µg/L No EPA limit set | 1/671 | SYR4 | 2012–2019 |
| Carbon Tetrachloride | 0.7200 µg/L 14% of the EPA limit 5 µg/L | 1/1710 | SYR4 | 2012–2019 |
| Dichloromethane | 0.8500 µg/L 17% of the EPA limit 5 µg/L | 1/1711 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 1.2 µg/L No EPA limit set | 1/108 | SYR4 | 2015–2019 |
| Nitrite | 195 µg/L 20% of the EPA limit 1000 µg/L | 1/163 | SYR4 | 2012–2019 |
73 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,2,4-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-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCyanideCarbofuranChlordaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPfdaPfdoaPfeesaPfhpaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineThallium, TotalTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidVinyl ChlorideO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Cal-Water Service Co.-Chico
Is Cal-Water Service Co.-Chico tap water safe to drink?
EPA monitoring detected 38 contaminants in Cal-Water Service Co.-Chico'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 Cal-Water Service Co.-Chico's water?
EPA monitoring detected Nitrate, Tetrachloroethylene, cis-1,2-Dichloroethylene, TTHM, Nitrate-Nitrite, and others. The full list with the level and data source for each is above.
How many people does Cal-Water Service Co.-Chico serve?
Cal-Water Service Co.-Chico reports serving 114,925 people in California, per its EPA record.
Has Cal-Water Service Co.-Chico had any water quality violations?
The EPA has 12 violations on file for Cal-Water Service Co.-Chico, of which 12 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.