Daly City, CA Water Safety: 75/100 (2026)
4 ZIP codes · 2 water systems · Updated 2026-06-03
Water systems serving Daly City hold a strong EPA compliance record — the city places among the better-performing areas in CA with few health-based violations on file.
How Daly City Compares
Data: EPA SDWIS Last verified: 2026-06-03
What You Should Know About Daly City Water
- Average lead level: 0.0071 mg/L.
- Estimated remediation: $1,000 per household.
- CDC health risk index: 9.58.
Who Supplies Your Water in Daly City
Throughout Daly City, CA, water comes from one of 2 primary utilities out of 2 total systems — independent providers with different rate structures, infrastructure, and compliance records that vary across the service territory.
Overview
We track water quality and home safety data for 4 ZIP codes in Daly City, California, covering 2 community water systems serving approximately 110,390 people.
No EPA violations recorded across any ZIP codes in Daly City — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Daly City: B (75/100)
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
Daly City water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0071 mg/L (EPA action level: 0.015 mg/L)
- 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): 4 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 |
|---|---|---|---|
| 94014 | B | City of Daly City | 104,901 |
| 94015 | B | City of Daly City | 104,901 |
| 94016 | B | City of Daly City | 104,901 |
| 94017 | B | City of Daly City | 104,901 |
All ZIP Codes in Daly City
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 Daly City
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 Daly City Homeowners
Across Daly City, the equity share taken up by estimated remediation is small — a favorable ratio for most property owners.
Remediation costs in Daly City are relatively low compared to home values. The $400–$1,700 estimated range is a small fraction of median property value. Home values are 56% above the California average.
Lead Exposure Risk for Children in Daly City
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.
Lead risk in Daly City appears low overall, but individual homes may differ. Testing is the only way to confirm your water's lead content.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Flood & Climate Risk in Daly City
50% of ZIP codes in Daly City are mapped into FEMA-designated flood zones, and the NFIP records 36 claims reflecting a multi-event flood history. That combination places local flood exposure in the range where water-quality implications deserve at least periodic attention.
Daly City has a moderate flood history with 36 FEMA claims averaging $6,299 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 Daly City, CA