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.
8
health-based violations
9
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 1996-04-01 → 2000-07-01 |
| MCL | Health-based | Resolved | 1996-04-01 → 2000-07-01 |
| MCL | Health-based | Resolved | 1995-05-08 → 1995-08-24 |
| MCL | Health-based | Resolved | 1995-05-08 → 1995-08-24 |
| MCL | Health-based | Resolved | 1995-05-01 → 1995-05-31 |
| MCL | Health-based | Resolved | 1995-05-01 → 1995-05-31 |
| MCL | Health-based | Resolved | 1995-05-01 → 1995-05-31 |
| MCL | Health-based | Resolved | 1995-05-01 → 1995-05-31 |
| MR | Monitoring | Resolved | 2000-08-01 → 2000-08-31 |
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 | 6200 µg/L 62% of the EPA limit 10000 µg/L
worst single sample: 9266 µg/L | 1940/1950 | SYR4 | 2012–2019 |
| 1,1-Dichloroethylene | 2.432 µg/L 35% of the EPA limit 7 µg/L
worst single sample: 3.44 µg/L | 960/1616 | SYR4 | 2012–2019 |
| Trichloroethylene | 6.6235 µg/L 132% of the EPA limit, at the 95th percentile of samples — 5 µg/L
worst single sample: 9.19 µg/L | 690/1616 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 4.65 µg/L 93% of the EPA limit 5 µg/L
worst single sample: 5.94 µg/L | 641/1616 | SYR4 | 2012–2019 |
| Fluoride | 870 µg/L 22% of the EPA limit 4000 µg/L
worst single sample: 950 µg/L | 574/574 | SYR4 | 2012–2019 |
| TTHM | 53.305 µg/L 67% of the EPA limit 80 µg/L
worst single sample: 59.4 µg/L | 400/1306 | SYR4 | 2012–2019 |
| Chloroform | 17.5215 µg/L No EPA limit set
worst single sample: 28.13 µg/L | 300/1307 | SYR4 | 2012–2019 |
| Bromodichloromethane | 17.078 µg/L No EPA limit set
worst single sample: 19.51 µg/L | 217/1307 | SYR4 | 2012–2019 |
| Dibromochloromethane | 18.15 µg/L No EPA limit set
worst single sample: 21.35 µg/L | 217/1307 | SYR4 | 2012–2019 |
| Bromoform | 6.5205 µg/L No EPA limit set
worst single sample: 8.67 µg/L | 214/1307 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 13 µg/L No EPA limit set
worst single sample: 23 µg/L | 199/241 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 6.935 µg/L No EPA limit set
worst single sample: 8.2 µg/L | 194/241 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 26 µg/L 43% of the EPA limit 60 µg/L
worst single sample: 39 µg/L | 194/241 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 7.63 µg/L No EPA limit set
worst single sample: 13 µg/L | 175/241 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 38/38 | LCR | 2023 |
| Barium | 160 µg/L 8% of the EPA limit 2000 µg/L | 18/43 | SYR4 | 2012–2019 |
| Arsenic | 8.24 µg/L 82% of the EPA limit 10 µg/L
worst single sample: 8.4 µg/L | 17/48 | SYR4 | 2012–2019 |
| Chromium | 11.6063 µg/L 12% of the EPA limit 100 µg/L
worst single sample: 18 µg/L | 16/63 | SYR4 | 2012–2019 |
| Combined Uranium | 6.81049 µg/L 23% of the EPA limit 30 µg/L
worst single sample: 9.39594 µg/L | 13/40 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.6 µg/L No EPA limit set | 13/241 | SYR4 | 2012–2019 |
| Copper | 68.371 µg/L 5.3% of the EPA limit 1300 µg/L
worst single sample: 120 µg/L | 10/551 | SYR4 | 2012–2019 |
| Antimony, Total | 0.0790 µg/L 1.3% of the EPA limit 6 µg/L
worst single sample: 0.0810 µg/L | 9/48 | SYR4 | 2012–2019 |
| Lead | 6.6152 µg/L 44% of the EPA limit 15 µg/L
worst single sample: 11 µg/L | 9/46 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 6160 µg/L 62% of the EPA limit 10000 µg/L
worst single sample: 6600 µg/L | 9/10 | SYR4 | 2016–2019 |
| Selenium | 4.1556 µg/L 8.3% of the EPA limit 50 µg/L
worst single sample: 5.7 µg/L | 9/46 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 2.5 µg/L No EPA limit set
worst single sample: 2.6 µg/L | 6/241 | SYR4 | 2012–2019 |
| Lithium | 47.1 µg/L No EPA limit set | 6/22 | UCMR-5 | 2025 |
| Beryllium, Total | 0.0048 µg/L 0.1% of the EPA limit 4 µg/L
worst single sample: 0.0050 µg/L | 5/43 | SYR4 | 2012–2019 |
| Cadmium | 0.0141 µg/L 0.3% of the EPA limit 5 µg/L
worst single sample: 0.0150 µg/L | 3/48 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 2.47 pCi/L 49% of the EPA limit 5 pCi/L | 1/1 | SYR4 | 2018 |
| Ethylbenzene | 0.5000 µg/L 0.1% of the EPA limit 700 µg/L | 1/1616 | SYR4 | 2012–2019 |
| Xylenes, Total | 3 µg/L 0% of the EPA limit 10000 µg/L | 1/1605 | SYR4 | 2012–2019 |
76 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBromateChlorobenzeneCyanideCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about California Water Service Co. - Ela
Is California Water Service Co. - Ela tap water safe to drink?
EPA monitoring detected 37 contaminants in California Water Service Co. - Ela'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 California Water Service Co. - Ela's water?
EPA monitoring detected Nitrate, 1,1-Dichloroethylene, Trichloroethylene, Tetrachloroethylene, Fluoride, and others. The full list with the level and data source for each is above.
How many people does California Water Service Co. - Ela serve?
California Water Service Co. - Ela reports serving 152,474 people in California, per its EPA record.
Has California Water Service Co. - Ela had any water quality violations?
The EPA has 9 violations on file for California Water Service Co. - Ela, of which 8 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.