Thousand Oaks, CA 91362
3 water systems • 67,080 residents
Excellent water quality with minimal contaminants
Score: 94/100
Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.
Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts
3
Contaminants Detected
23
Violations on Record
12
Health-Based Violations
0
Recent Violations
Grade Breakdown
94 / 100 points
Recommended Water Filters
- ✓Reverse Osmosis or Ion Exchange Filter
- ✓Ultraviolet (UV) Purification
Consult a water quality specialist for personalized recommendations.
Thousand Oaks vs CA & National Average
Detected Contaminants
3 contaminants detected across water systems serving this ZIP code
| Contaminant | Category |
|---|---|
| Nitrate | Agricultural |
| Coliform (TCR) | Microorganism |
| Revised Total Coliform Rule | Microorganism |
Water System Information
- Systems Serving This ZIP:
- TRIUNFO WATER & SANITATION DISTRICT, DEL SUR GARDENS TRAILER PARK, CITY OF THOUSAND OAKS WATER DEPARTMENT
- Population Served:
- 67,080
- Systems With Violations:
- 2 of 3
- Major Violations:
- 5
- Enforcement Actions:
- 22
Frequently Asked Questions
What does the grade mean?
Our A–F grade ranks this ZIP code's water quality against every other analyzed ZIP in the country, based on EPA data. A = among the best, F = among the most troubled.
Is my tap water safe to drink?
Water systems regulated by the EPA must comply with Safe Drinking Water Act standards. However, if you're concerned about water quality, consider a water filter appropriate for your contaminants.
How often is the data updated?
We update our data quarterly with the latest EPA ECHO and Envirofacts data. Historical violations are tracked to identify patterns.
What filters do you recommend?
Filter recommendations are based on detected contaminants in your area. See our Filter Guide for detailed information about different filter types.