Coronado, CA Water Safety: 69/100 (2026)
2 ZIP codes · 3 water systems · Updated 2026-06-03
Public water data for Coronado, CA reveals a split picture — tap water quality varies meaningfully by service area and the city's grade reflects that variability.
How Coronado Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Coronado Residents
- Estimated remediation: $1,850 per household.
- CDC health risk index: 10.18.
Coronado's Water Providers
Water delivery in Coronado, CA is handled by 3 utilities rather than a single system — drawn from 3 providers in federal records, each filing its own compliance reports and setting its own rates.
Overview
We track water quality and home safety data for 2 ZIP codes in Coronado, California (population ~18,495), covering 3 community water systems serving approximately 1,528,369 people region-wide.
No EPA violations recorded across any ZIP codes in Coronado — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Coronado: C (69/100)
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
Coronado water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Coronado
- 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 |
|---|---|---|---|
| 92118 | C | Cal-am Water Coronado | 106,000 |
| 92178 | B | SAN DIEGO, CITY OF | 1,385,379 |
All ZIP Codes in Coronado
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.
Coronado 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 Coronado
For most homeowners in Coronado, the estimated cost of water and safety remediation represents a proportionally modest share of what properties are worth — placing this area in the lower tier of the remediation share scale.
Remediation costs in Coronado are relatively low compared to home values. The $1,300–$2,900 estimated range is a small fraction of median property value. Home values are 171% above the California average.
Coronado: Flood History & Water Damage Risk
Over the multi-decade window covered by the National Flood Insurance Program, Coronado has accumulated 36 claims — a total that suggests more than isolated flood exposure. With 100% 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.
Coronado has a moderate flood history with 36 FEMA claims averaging $31,527 per payout. 100% 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>$1,850</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 Coronado
- 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 Coronado, CA