Is Thousand Oaks, CA tap water safe?
The short answer
None of the 5 utilities serving Thousand Oaks has a result above a legal limit or action level, or a health-based violation since 2016, in EPA’s and California’s records.
City of Thousand Oaks Water Department, which serves the most people here, has nothing above a health goal in EPA’s and California’s records. That data covers what its report lists, not everything.
A town can be served by more than one utility, and some homes are on private wells. The name on your water bill tells you which is yours, and your ZIP code narrows it down. They are listed by how many people each serves in Thousand Oaks’s ZIP codes, from EPA’s estimates.
- Open report
City of Thousand Oaks Water Department
California · serves 54,770 people · about 24,700 in Thousand Oaks
Nothing in its records is above a health goal.
No health-based violations since 2016
- Open report
Cal American Water Co
California · serves 66,809 people · about 24,500 in Thousand Oaks
1 result above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 17.9 ppb, above EPA’s health benchmark.
No health-based violations since 2016
- Open report
California Water Service Co - Westlake
California · serves 19,544 people · about 6,100 in Thousand Oaks
1 result above the health goal. The worst: Lead at 3.0 ppb, above the health goal.
No health-based violations since 2016
- Open report
Las Virgenes MWD
California · serves 77,562 people · about 2,200 in Thousand Oaks
2 results above the health goal and 1 result above EPA’s health benchmark. The worst: Lithium at 15 ppb, above EPA’s health benchmark. Hardness: hard, 141 mg/L (8.2 grains per gallon).
No health-based violations since 2016
- Open report
Ventura Cwwd No. 38 - Lake Sherwood
California · serves 1,759 people · about 240 in Thousand Oaks
1 result above the health goal. The worst: Lead at 7.0 ppb, above the health goal.
No health-based violations since 2016
Water testing near Thousand Oaks
The 3 labs California certifies closest to Thousand Oaks, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Camrosa Water District Wastewater Laboratory
Camarillo, CA · about 10 miles
Certified for bacteria
Ventura County Public Health Laboratory
Oxnard, CA · about 15 miles
Certified for bacteria
Fruit Growers Laboratory, Inc.
Santa Paula, CA · about 16 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, radioactivity
Which ZIP codes are in Thousand Oaks: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: California State Water Resources Control Board, ELAP accredited laboratories and their fields of accreditation; distances from the Census 2020 ZIP code tabulation area gazetteer.
Near Thousand Oaks
Other towns in Ventura County with a page of their own.
What to do next
- Read City of Thousand Oaks Water Department’s full reportEvery result with its dates, the violations, and the certification claim that handles each finding.Open the report
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded
- On a private well?No utility tests a well. A certified lab test is the first step.How to test well water