Fairfax, CA Water Safety: 63/100 (2026)
2 ZIP codes · 2 water systems · Updated 2026-06-03
Recent monitoring in Fairfax shows middle-tier safety for CA — some systems are clean; others have logged EPA violations.
How Fairfax Compares
Data: EPA SDWIS Last verified: 2026-06-03
Fairfax Water: The Quick Version
- Estimated remediation: $1,200 per household.
- CDC health risk index: 10.78.
Water Systems Serving Fairfax
2 independent water providers serve Fairfax, CA — 2 systems appear in federal records.
Overview
We track water quality and home safety data for 2 ZIP codes in Fairfax, California (population ~8,564), covering 2 community water systems serving approximately 187,195 people region-wide.
No EPA violations recorded across any ZIP codes in Fairfax — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Fairfax: C (63/100)
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
Fairfax water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Fairfax
- 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): 2 ZIP codes
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 94930 | C | Marin Municipal Water District | 186,895 |
| 94978 | C | MOREHEAD PARK | 300 |
All ZIP Codes in Fairfax
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 Fairfax
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
Fairfax: Remediation Cost in Perspective
The household financial picture for Fairfax homeowners is proportionally favorable — addressing documented issues claims a small slice of equity, and the cost-to-value ratio puts this area well within the manageable tier.
Remediation costs in Fairfax are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 56% above the California average.
Climate-Related Water Risk for Fairfax
Within the NFIP's national dataset, Fairfax falls in moderate-exposure territory — 131 documented incidents spanning multiple decades, with 50% of local ZIP codes sitting inside FEMA flood boundaries. That combination warrants inclusion in any thorough local water quality review.
Fairfax has a moderate flood history with 131 FEMA claims averaging $15,280 per payout. 50% 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.
What You Can Do in Fairfax
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Fairfax, CA