Public water system record
City of Thousand Oaks Water Department
Serves Thousand Oaks, Ventura County, CA · 53,157 people served
Federal records show no health-based violations and no monitoring or reporting issues for City of Thousand Oaks Water Department in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 0
Key facts
- City of Thousand Oaks Water Department buys its water from Calleguas Municipal Water Dist.
- Lead pipe inventory: 0 lead and 0 unknown out of 17,269 service lines.
Check whether City of Thousand Oaks Water Department serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016, and no monitoring or reporting violations either.
Where the water comes from
City of Thousand Oaks Water Department buys its water from Calleguas Municipal Water Dist. It lists no wells or intakes of its own. It also has emergency connections to Cal American Water Co and California Water Service Co - Westlake. 1 other public water system has an emergency connection to City of Thousand Oaks Water Department.
Buys water from
- Calleguas Municipal Water Dist Thousand Oaks, CA
Emergency or part-time connections to
- Cal American Water Co Rosemead, CA
- California Water Service Co - Westlake San Jose, CA
Annual water quality report
City of Thousand Oaks Water Department must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by California.
Certified drinking water labs by state EPA guidance for private wells