Solano County, California
18 ZIP codes · Avg score 79/100 · Grade B · Updated 2026-06-03
Unlike many counties its size, Solano County keeps violation rates low — all 18 ZIP codes score at or above the state average for tap water safety, with no systemic concerns flagged in the current data set.
How Solano County Compares
How Solano County Compares
Solano County scores 6 points above the California state average (73/100) and 11 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Solano County, California
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.6 (asthma 10%, diabetes 12%)
Estimated additional annual cost per homeowner: $2,109, driven primarily by flood
Infrastructure: 0.348% avg pipe failure probability, 28% of ZIPs at high risk
61.1% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
↑ Worsening trendEPA violation counts by year across Solano County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 28 violations. Past 5 years: 48 total (48 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $2,109
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
156,838 housing units in Solano County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Solano County
Remediation costs are relatively manageable for most homeowners in Solano County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Solano County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Solano County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Suisun-solano Water Authority | 29,105 | 28 |
| 2 | City of Vacaville | 97,000 | 21 |
| 3 | California State Prison - Solano | 5,100 | 21 |
| 4 | Rural North Vacaville Water District | 1,313 | 21 |
| 5 | Vineyard Rv Park | 550 | 21 |
21 total water systems serve Solano County.
All ZIP Codes in Solano County
18 ZIP codes tracked in Solano County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 94592 | Vallejo | 99 | A | 0 | $681K |
| 2 | 94510 | Benicia | 90 | A | 0 | $779K |
| 3 | 94589 | Vallejo | 90 | A | 0 | $479K |
| 4 | 94591 | Vallejo | 90 | A | 0 | $602K |
| 5 | 95625 | Elmira | 88 | A | 0 | — |
| 6 | 94571 | Rio Vista | 85 | A | 0 | $480K |
| 7 | 94590 | Vallejo | 85 | A | 0 | $511K |
| 8 | 95696 | Vacaville | 80 | B | 7 (6 health) | — |
| 9 | 94585 | Suisun City | 77 | B | 0 | $551K |
| 10 | 95690 | Walnut Grove | 75 | B | 8 (7 health) | $711K |
| 11 | 94512 | Birds Landing | 73 | B | 0 | — |
| 12 | 94535 | Travis Afb | 73 | B | 0 | — |
| 13 | 94569 | Port Costa | 73 | B | 0 | $587K |
| 14 | 94534 | Fairfield | 70 | B | 7 (5 health) | $701K |
| 15 | 95687 | Vacaville | 70 | B | 7 (6 health) | $584K |
| 16 | 95688 | Vacaville | 70 | B | 7 (6 health) | $657K |
| 17 | 94525 | Crockett | 66 | C | 0 | $709K |
| 18 | 94533 | Fairfield | 65 | C | 7 (5 health) | $497K |
Recommended Buyer Guides for Solano County
Independent picks. EPA-grounded. Matched here.
- Best Lead Paint Test Kits — 61.1% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Solano County, California
Overview
Solano County in California covers 18 ZIP codes with an average Home Safety Score of B (79/100).
6 of 18 ZIP codes have recorded EPA violations. 35 health-based violations have been documented.
← Back to California water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.