Drinking water quality · 2026
· Verified
What's in City of Thousand Oaks Water Department, CA tap water
11 contaminants were measured in the City of Thousand Oaks Water Department, CA water system's 2026 annual report. Each is shown below against its federal limit.
- Reporting year
- 2026
- Contaminants measured
- 11
- Over federal limit
- 0
- Approaching the limit
- 0
- Service area
- CA
Where your water comes from · EPA SDWIS
City of Thousand Oaks Water Department, CA buys its drinking water from CALLEGUAS MUNICIPAL WATER DIST, CAL AMERICAN WATER CO, and 1 more.
Source
Treatment
Distribution
Also buys water from CALLEGUAS MUNICIPAL WATER DIST, CAL AMERICAN WATER CO, and 1 more.
Historical readings · EPA Six-Year Review (2012–2019)
11 historically-detected contaminants in City of Thousand Oaks Water Department, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
TTHM worst: 2015 | 0.0544 mg/L within | 0.08 mg/L | '12'13'14'15'16'17'18'19 |
HAA5 worst: 2017 | 0.012 mg/L within | 0.06 mg/L | '12'13'14'15'16'17'18'19 |
DBAA worst: 2012 | 0.006 mg/L | — | '12'13'14'15'16'17'18'19 |
DCAA worst: 2012 | 0.003 mg/L | — | '12'13'14'15'16'17'18'19 |
MBAA worst: 2013 | 0.002 mg/L | — | '13'14'15'16 |
MCAA worst: 2015 | 0.003 mg/L | — | '15 |
TCAA worst: 2012 | 0.001 mg/L | — | '12'13'14'15'16'17 |
BROMODICHLOROMETHANE worst: 2012 | 0.0064 mg/L | — | '12'13'14'15'16'17'18'19 |
BROMOFORM worst: 2012 | 0.0106 mg/L | — | '12'13'14'15'16'17'18'19 |
CHLOROFORM worst: 2012 | 0.0034 mg/L | — | '12'13'14'15'16'17'18'19 |
DIBROMOCHLOROMETHANE worst: 2012 | 0.0102 mg/L | — | '12'13'14'15'16'17'18'19 |
People also ask about City of Thousand Oaks Water Department, CA's water
+Is City of Thousand Oaks Water Department, CA tap water safe to drink in 2026?
Every one of the 11 contaminants measured in City of Thousand Oaks Water Department, CA's 2026 Consumer Confidence Report is below its federal limit. "Safe" under the EPA's drinking-water standards is health-based, not aesthetic — but by those standards, no measured contaminant in this report exceeds its enforceable threshold. Individual health concerns (e.g. immunocompromised, infant, pregnancy) may warrant additional filtering regardless of compliance.
+What contaminants are in City of Thousand Oaks Water Department, CA tap water?
11 contaminants were measured in City of Thousand Oaks Water Department, CA's 2026 Consumer Confidence Report, spanning disinfection byproducts and other. 2 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Where does the data on this page come from?
Every value is transcribed from City of Thousand Oaks Water Department, CA's 2026 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is City of Thousand Oaks Water Department, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2026 report; a new report will replace it once the utility publishes its next annual update.