Sierra Madre, CA Water Safety: 71/100 (2026)
2 ZIP codes · 2 water systems · Updated 2026-06-03
Although water quality varies across any metro, Sierra Madre's systems collectively post above-average compliance scores for CA — and documented violations are few.
How Sierra Madre Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Sierra Madre Water
- Estimated remediation: $1,000 per household.
- CDC health risk index: 10.71.
Who Supplies Your Water in Sierra Madre
Across Sierra Madre, CA, residential water comes from 2 primary utilities rather than a single consolidated provider. Each system operates independently — managing its own distribution infrastructure, rate schedules, and EPA compliance filings. Federal records track 2 water systems in the area, with these top providers accounting for the majority of residential connections.
Overview
We track water quality and home safety data for 2 ZIP codes in Sierra Madre, California (population ~11,020), covering 2 community water systems serving approximately 62,361 people region-wide.
No EPA violations recorded across any ZIP codes in Sierra Madre — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Sierra Madre: B (71/100)
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
Sierra Madre water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Sierra Madre
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 2 ZIP codes
- Zone 3 (Low): 0 ZIP codes
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 91024 | B | Sierra Madre-city, Water Department | 11,000 |
| 91025 | B | Sierra Madre-city, Water Department | 11,000 |
All ZIP Codes in Sierra Madre
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.
Health Outcomes in Sierra Madre
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
Cost Context: What Remediation Means for Sierra Madre Homeowners
What does remediation cost in financial context for Sierra Madre homeowners? Proportionally very little — the equity share here is low, and addressing documented issues is a manageable planning question rather than a material financial burden.
Remediation costs in Sierra Madre are relatively low compared to home values. The $400–$1,700 estimated range is a small fraction of median property value. Home values are 59% above the California average.
Flood & Climate Risk in Sierra Madre
21 FEMA flood insurance claims are on file for Sierra Madre, 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.
Sierra Madre has a moderate flood history with 21 FEMA claims averaging $3,189 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>$1,000</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 Sierra Madre, CA