States › California › Solano County

Solano County, CA Water Quality

Water quality data for 9 public water systems serving Solano County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 9 water systems · 11 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Solano County Earns a B

Solano County: 11 communities across 9 water systems. 81.8% have no open violations.

  • Median lead where detected: 2.55 ppb
  • 2 communities with a lead detection, 9 reporting none detected
  • 2 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 81.8% of communities have no open violations
2.55 ppb
Median Lead Level
County-wide, 90th percentile
9
Water Systems
Active CWS & NTNCWS
81%
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
  • Vallejo
    Not detected
    No federal limits exceeded on record
    A
  • Benicia
    2.30 ppb
    No federal limits exceeded on record
    A
  • Dixon
    Not detected
    No federal limits exceeded on record
    A
  • Rio Vista
    Not detected
    No federal limits exceeded on record
    A
  • Allendale
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Suisun City
    Not detected
    1 violation currently open
    D
  • Fairfield
    Not detected
    1 violation currently open
    C
  • Vacaville
    Not detected
    PFAS above the limit at 1 of 8 sampling points
    C
  • Elmira
    Not detected
    PFAS above the limit at 1 of 8 sampling points
    C
  • Vallejo
    Not detected
    No federal limits exceeded on record
    A
County Lead Level — Median 2.55 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.55 ppb — 17% of the federal action level
Systems by Lead Level
Under 5 ppb
2
No Data
9

All Cities in Solano County

Fairfield Not detected C
Vacaville Not detected C
Vallejo Not detected A
Suisun City Not detected D
Benicia 2.30 ppb A
Dixon Not detected A
Rio Vista Not detected A
Allendale Not detected B
Hartley Not detected B
Green Valley 2.80 ppb B
Elmira Not detected C
Showing 11 cities
No active violations Active violations

About Solano County Drinking Water

Solano County is served by 9 water systems covering 11 communities. 82% have no open violations.

Of the communities reporting lead results, 2 recorded a detection, with a median of 2.55 ppb — 17% of the federal action level. 9 reported none detected, which means below the laboratory limit rather than an absence of lead.

2 of 11 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Solano County tap water safe to drink?▼
82% of communities have no open violation. 2 of 11 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Solano County?▼
Among communities with a detection the median is 2.55 ppb, 17% of the 15 ppb action level. 9 reported none detected and 0 reported no result.
How many water systems serve Solano County?▼
9 community water systems serve 11 communities here.
← Back to California water quality overview