Is Thousand Oaks, CA Tap Water Safe to Drink?
Thousand Oaks tap water meets federal Safe Drinking Water Act standards but 3 of 4 ZIP codes show detections above EPA health guidelines, primarily for lithium. A certified filter is recommended for households that want an additional layer of protection.
Where Does Thousand Oaks Get Its Water?
Water in Thousand Oaks, CA is provided by 4 public water systems: THOUSAND OAKS WATER DEPT, CAL AMERICAN WATER CO, CALIFORNIA WATER SERVICE CO - WESTLAKE and LAS VIRGENES MWD.
How Is Thousand Oaks Tap Water Treated?
Treated water is disinfected using free chlorine and calcium hypochlorite and chloramines and ozone. Treatment includes conventional treatment (coagulation, flocculation, and filtration).
What's in Thousand Oaks Tap Water?
The following contaminants were detected most frequently in Thousand Oaks public water systems. 3 of 4 ZIP codes showed detections above EPA health guidelines.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 15.1 µg/L | 10 µg/L | 3 ZIPs | Above guideline |
| PFTrDA | 0.007 µg/L | — | 0 ZIPs | Within guideline |
| 11Cl-PF3OUdS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| PFBA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| 8:2 FTS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Thousand Oaks
Based on EPA monitoring data, 3 of 4 ZIP codes in Thousand Oaks have recorded detections above EPA health guidelines. Sensitive populations such as infants, pregnant individuals, and those with weakened immune systems may benefit from an additional layer of protection such as a certified point-of-use filter.
Best Broad-Spectrum Filters for This Water Profile
This city profile includes PFAS detections, chlorine disinfection, and other dissolved contaminants. Reverse osmosis (RO) systems certified under NSF/ANSI 58 provide broad reduction coverage; for PFAS specifically, confirm NSF/ANSI P473 or equivalent PFAS reduction certification.
8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.
See recommendations matched to your exact address: choose your ZIP code below.
Frequently Asked Questions about Thousand Oaks Tap Water
Is Thousand Oaks tap water safe to drink?
Thousand Oaks tap water meets Safe Drinking Water Act requirements but 3 of 4 ZIP codes show contaminant levels above EPA health-based guidelines. A certified point-of-use filter adds an extra layer of protection.
What contaminants are in Thousand Oaks tap water?
The most commonly detected contaminants in Thousand Oaks water systems include: lithium, PFTrDA, 11Cl-PF3OUdS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Thousand Oaks get its drinking water?
Thousand Oaks receives water from 4 public water systems, including THOUSAND OAKS WATER DEPT.
Do I need a water filter in Thousand Oaks?
If your ZIP code is among those with detections above EPA health guidelines, choose a filter certified for the specific contaminants shown in your ZIP report. Reverse osmosis is generally the broadest option for PFAS, lithium, and many other dissolved contaminants.
How often is Thousand Oaks tap water tested?
Public water systems in Thousand Oaks are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2024-11-14.
Tap water reports by ZIP in Thousand Oaks
- 91320 - Casa Conejo, Thousand Oaks tap water report Some concern
- 91360 - Mountclef Village, Thousand Oaks tap water report Higher concern
- 91361 - Triunfo Corner, Thousand Oaks tap water report Higher concern
- 91362 - North Ranch, Thousand Oaks tap water report Higher concern
Water utilities serving Thousand Oaks, CA
Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.
- CAL AMERICAN WATER COAction advised
- CALIFORNIA WATER SERVICE CO - WESTLAKEAction advised
- THOUSAND OAKS WATER DEPTAction advised
- CALLEGUAS MUNICIPAL WATER DISTNo recent federal sampling
Also covers / overlaps with
- Thousand Oaks CCD, CA · Township
- Agoura Hills-Malibu CCD, CA · Township
- Triunfo Pass-Point Mugu CCD, CA · Township
- Westlake Village, CA
- Lake Sherwood, CA · CDP
- Newbury Park, CA · Community