Tap WaterIndex

← California

Tap water quality report

City of Thousand Oaks Water Department

EPA monitoring tested this supplier for 42 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

42
contaminants tested
12
detected
53,157
people served
0
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
SWP
Ownership
Local government
Counties served
Ventura

Compliance record

No violations on file. The EPA has no formal drinking-water violations recorded for this supplier.

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Bromodichloromethane
10.2 µg/L
No EPA limit set
 124/124 SYR4 2012–2019
Bromoform
21.3 µg/L
No EPA limit set
 124/124 SYR4 2012–2019
Dibromochloromethane
21.5 µg/L
No EPA limit set
 124/124 SYR4 2012–2019
TTHM
54.4 µg/L 68%
of the EPA limit 80 µg/L
 124/124 SYR4 2012–2019
Chloroform
7.6 µg/L
No EPA limit set
 117/124 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
12 µg/L 20%
of the EPA limit 60 µg/L
 116/124 SYR4 2012–2019
Dibromoacetic Acid
9 µg/L
No EPA limit set
 115/124 SYR4 2012–2019
Dichloroacetic Acid
4 µg/L
No EPA limit set
 81/124 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 44/44 LCR 2025
Trichloroacetic Acid
2 µg/L
No EPA limit set
 24/124 SYR4 2012–2019
Monobromoacetic Acid
3 µg/L
No EPA limit set
 22/124 SYR4 2012–2019
Monochloroacetic Acid
3 µg/L
No EPA limit set
 1/124 SYR4 2012–2019
30 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaHfpo-DaNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaLithium

Utility contact

Contact
HEYDARI, NADER
Phone
805-449-2392
Email
nheydari@toaks.gov

Frequently asked questions about City of Thousand Oaks Water Department

Is City of Thousand Oaks Water Department tap water safe to drink?

EPA monitoring detected 12 contaminants in City of Thousand Oaks Water Department'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 City of Thousand Oaks Water Department's water?

EPA monitoring detected Bromodichloromethane, Bromoform, Dibromochloromethane, TTHM, Chloroform, and others. The full list with the level and data source for each is above.

How many people does City of Thousand Oaks Water Department serve?

City of Thousand Oaks Water Department reports serving 53,157 people in California, per its EPA record.

Has City of Thousand Oaks Water Department had any water quality violations?

The EPA has no formal drinking-water violations on file for City of Thousand Oaks Water Department.

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.