States › California › Ventura County

Ventura County, CA Water Quality

Water quality data for 10 public water systems serving Ventura County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 10 water systems · 24 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Ventura County Earns a A

Ventura County: 24 communities across 10 water systems. 100.0% have no open violations.

  • Median lead where detected: 3.00 ppb
  • 5 communities with a lead detection, 8 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
3 ppb
Median Lead Level
County-wide, 90th percentile
10
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Oxnard
    Not reported
    No federal limits exceeded on record
    B
  • Simi Valley
    Not reported
    No federal limits exceeded on record
    B
  • Thousand Oaks
    Not reported
    No federal limits exceeded on record
    B
  • Camarillo
    Not reported
    No federal limits exceeded on record
    B
  • Moorpark
    Not reported
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Oak View
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Mira Monte
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Ojai
    Not detected
    Copper above the 1,300 ppb action level
    B
  • Meiners Oaks
    Not detected
    Copper above the 1,300 ppb action level
    B
  • San Buenaventura (Ventura)
    Not detected
    3 health-based violations since 2015
    B
County Lead Level — Median 3 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 3 ppb — 20% of the federal action level
Systems by Lead Level
Under 5 ppb
3
5 – 10 ppb
2
No Data
19

All Cities in Ventura County

Oxnard Not reported B
Simi Valley Not reported B
Thousand Oaks Not reported B
San Buenaventura (Ventura) Not detected B
Camarillo Not reported B
Moorpark Not reported B
Santa Paula Not reported B
Fillmore Not reported B
Port Hueneme 2.20 ppb A
Oak Park Not detected A
Oak View Not detected B
Mira Monte Not detected B
Ojai Not detected B
El Rio Not reported B
Meiners Oaks Not detected B
Santa Rosa Valley Not reported B
Casa Conejo 3.00 ppb A
Piru Not reported B
Lake Sherwood 7.00 ppb B
Bell Canyon 8.00 ppb B
Channel Islands Beach 2.20 ppb A
Somis Not detected B
Santa Susana Not reported B
Saticoy Not detected B
Showing 24 cities
No active violations Active violations

About Ventura County Drinking Water

Ventura County is served by 10 water systems covering 24 communities. No community here has an open violation on record.

Of the communities reporting lead results, 5 recorded a detection, with a median of 3.00 ppb — 20% of the federal action level. 8 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Ventura County tap water safe to drink?▼
No community in Ventura County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Ventura County?▼
Among communities with a detection the median is 3.00 ppb, 20% of the 15 ppb action level. 8 reported none detected and 11 reported no result.
How many water systems serve Ventura County?▼
10 community water systems serve 24 communities here.
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