Public water system record
Cal American Water Co
Serves Thousand Oaks and Casa Conejo, Ventura County, CA · 66,809 people served
Federal records show no health-based violations and 1 monitoring/reporting issue for Cal American Water Co 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
- 1
Key facts
- Cal American Water Co buys its water from Calleguas Municipal Water Dist.
- Most recent formal enforcement: compliance order (no penalty) by California, March 2023.
- Record on file since 1997, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 20,443 service lines.
Check whether Cal American Water Co 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.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Oct 1, 2022 | Resolved |
Full record since 1997
EPA's records for Cal American Water Co go back to 1997. Before October 19, 2016 they list 1 health-based violation (1 resolved) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 1 | 0 |
| 2020s | 0 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform, began November 1997, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 1997 | Resolved |
Enforcement actions
California regulators took 1 formal enforcement action against Cal American Water Co in 2023. The most recent was a compliance order (no penalty) in March 2023.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 27, 2023 | California | Compliance order (no penalty) | 1 violation: Revised Total Coliform Rule |
Where the water comes from
Cal American Water Co buys its water from Calleguas Municipal Water Dist. It lists no wells or intakes of its own. It also has an emergency connection to City of Thousand Oaks Water Department. 1 other public water system has an emergency connection to Cal American Water Co.
Buys water from
- Calleguas Municipal Water Dist Thousand Oaks, CA
Emergency or part-time connections to
- City of Thousand Oaks Water Department Thousand Oaks, CA
Annual water quality report
Cal American Water Co 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