Corte Madera, CA Water Safety: 82/100 (2026)
2 ZIP codes · 1 water system · Updated 2026-06-03
Corte Madera tap water earns a high safety grade — above-average compliance with CA and federal standards.
How Corte Madera Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Corte Madera Residents
- Estimated remediation: $1,200 per household.
- CDC health risk index: 10.78.
Corte Madera's Water Providers
While 1 water system appear in federal records for Corte Madera, CA, one provider supplies the majority of residential connections — making it the central point of infrastructure and compliance accountability for most households.
Overview
We track water quality and home safety data for 2 ZIP codes in Corte Madera, California (population ~10,101), covering 1 community water system serving approximately 186,895 people region-wide.
No EPA violations recorded across any ZIP codes in Corte Madera — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Corte Madera: B (82/100)
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
Corte Madera water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Corte Madera
- 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 |
|---|---|---|---|
| 94925 | B | Marin Municipal Water District | 186,895 |
| 94976 | A | Marin Municipal Water District | 186,895 |
All ZIP Codes in Corte Madera
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.
Corte Madera Community Health Snapshot
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 Remediation Costs Compare in Corte Madera
Because property values in Corte Madera comfortably exceed estimated remediation costs, the equity impact here is proportionally small.
Remediation costs in Corte Madera are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 130% above the California average.
Corte Madera: Flood History & Water Damage Risk
172 FEMA flood insurance claims are on file for Corte Madera, and 50% of local ZIP codes fall within federally designated flood zones — enough to put flood exposure on the planning radar, though short of the concentrated-risk threshold where treatment-system vulnerability becomes a primary consideration.
Corte Madera has a moderate flood history with 172 FEMA claims averaging $7,523 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.
Deep Dive Reports
Detailed analysis for Corte Madera, CA