Vallejo, CA Water Safety: 91/100 (2026)
4 ZIP codes · 6 water systems · Updated 2026-06-03
Public water monitoring in Vallejo shows a safety record well above the CA median — health-based violations are isolated exceptions rather than recurring patterns, the city's systems have stayed compliant across recent reporting cycles, and no cluster of recurring exceedances appears in any single service area.
How Vallejo Compares
Data: EPA SDWIS Last verified: 2026-06-03
Vallejo Water: The Quick Version
- Average lead level: 0.0014 mg/L.
- Homes built before 1986: 58% — older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 11.66.
Water Systems Serving Vallejo
At present, 3 utilities serve the bulk of Vallejo, CA's residential water connections out of 6 systems active in the area, spread across independent providers with separate infrastructure and compliance obligations.
Overview
We track water quality and home safety data for 4 ZIP codes in Vallejo, California (population ~127,038), covering 6 community water systems serving approximately 293,168 people region-wide.
No EPA violations recorded across any ZIP codes in Vallejo — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Vallejo: A (91/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Vallejo water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0014 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 4 ZIP codes
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 94589 | A | City of Vallejo | 121,420 |
| 94590 | A | City of Vallejo | 121,420 |
| 94591 | A | City of Vallejo | 121,420 |
| 94592 | A | City of Vallejo | 121,420 |
All ZIP Codes in Vallejo
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Vallejo
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
How Old Is Vallejo's Housing Stock?
With 58% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
When more than half a city's housing predates the 1986 federal ban on lead solder, plumbing-era lead risk becomes a citywide concern rather than an exception. Vallejo's median build year of 1980 places it squarely in that category.
Over half of homes in Vallejo were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Vallejo: Remediation Cost in Perspective
Given current Vallejo valuations, the remediation-to-property-value ratio is low — most homeowners are looking at a proportionally modest share that fits within routine financial planning.
Remediation costs in Vallejo are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 18% below the California average.
Protecting Children from Lead in Vallejo
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Even where utility-side monitoring meets Lead and Copper Rule requirements, the 58% pre-rule share in Vallejo keeps interior-plumbing variation as a household-level question that aggregate data cannot resolve.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Vallejo
Over the multi-decade window covered by the National Flood Insurance Program, Vallejo has accumulated 151 claims — a total that suggests more than isolated flood exposure. With 75% of ZIP codes in designated flood zones, the water-quality implications of flooding move from hypothetical to periodically relevant: treatment intake can be compromised, wells can be infiltrated, and distribution backflow can occur.
Vallejo has a moderate flood history with 151 FEMA claims averaging $5,800 per payout. 75% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,200</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Vallejo, CA