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 |
|---|---|---|---|---|
| Nitrate | 14000 µg/L 140% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 18984 µg/L | 946/956 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 6.2 µg/L No EPA limit set
worst single sample: 7.4 µg/L | 135/136 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 14.3 µg/L 24% of the EPA limit 60 µg/L
worst single sample: 28 µg/L | 135/136 | SYR4 | 2012–2019 |
| Bromoform | 16.05 µg/L No EPA limit set
worst single sample: 24 µg/L | 120/120 | SYR4 | 2012–2019 |
| Dibromochloromethane | 13 µg/L No EPA limit set
worst single sample: 18 µg/L | 120/120 | SYR4 | 2012–2019 |
| TTHM | 37 µg/L 46% of the EPA limit 80 µg/L
worst single sample: 49 µg/L | 120/120 | SYR4 | 2012–2019 |
| Bromodichloromethane | 5.715 µg/L No EPA limit set
worst single sample: 7.3 µg/L | 118/120 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 3.795 µg/L No EPA limit set
worst single sample: 9 µg/L | 102/136 | SYR4 | 2012–2019 |
| Chloroform | 4.83 µg/L No EPA limit set
worst single sample: 5.7 µg/L | 78/120 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 48/48 | LCR | 2023 |
| Selenium | 69.05 µg/L 138% of the EPA limit, at the 95th percentile of samples — 50 µg/L
worst single sample: 72 µg/L | 40/41 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 2 µg/L No EPA limit set
worst single sample: 2.4 µg/L | 36/136 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 1.4 µg/L 28% of the EPA limit 5 µg/L
worst single sample: 1.5 µg/L | 30/75 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 4.99 µg/L No EPA limit set
worst single sample: 18 µg/L | 24/136 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 4.185 µg/L No EPA limit set
worst single sample: 4.8 µg/L | 24/136 | SYR4 | 2012–2019 |
| Combined Uranium | 21.903 µg/L 73% of the EPA limit 30 µg/L
worst single sample: 23.84 µg/L | 14/14 | SYR4 | 2012–2017 |
| Fluoride | 622 µg/L 16% of the EPA limit 4000 µg/L
worst single sample: 640 µg/L | 7/7 | SYR4 | 2012–2018 |
| Lithium | 35.5 µg/L No EPA limit set | 4/6 | UCMR-5 | 2025 |
| Nitrate-Nitrite | 12950 µg/L 130% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 13000 µg/L | 2/2 | SYR4 | 2018 |
| Arsenic | 2.1 µg/L 21% of the EPA limit 10 µg/L | 1/7 | SYR4 | 2012–2018 |
| Gross Beta Particle Activity | 4.1 pCi/L No EPA limit set | 1/1 | SYR4 | 2017 |
63 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBariumBenzeneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneEthylbenzeneHfpo-DaLeadMercuryNetfosaaNfdhaNmefosaaNitritePfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaSimazineStyreneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Golden State Water Company - Simi Valley
Is Golden State Water Company - Simi Valley tap water safe to drink?
EPA monitoring detected 21 contaminants in Golden State Water Company - Simi Valley'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 Golden State Water Company - Simi Valley's water?
EPA monitoring detected Nitrate, Dibromoacetic Acid, Total Haloacetic Acids (HAA5), Bromoform, Dibromochloromethane, and others. The full list with the level and data source for each is above.
How many people does Golden State Water Company - Simi Valley serve?
Golden State Water Company - Simi Valley reports serving 45,128 people in California, per its EPA record.
Has Golden State Water Company - Simi Valley had any water quality violations?
The EPA has no formal drinking-water violations on file for Golden State Water Company - Simi Valley.
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.