Wilmington, CA Water Safety: 58/100 (2026)
2 ZIP codes · 1 water system · Updated 2026-06-03
Compliance figures for Wilmington indicate average water quality in CA overall — some service areas have recorded health-based violations in recent monitoring cycles, while others operate cleanly, making system-level data the most actionable reference point for residents.
How Wilmington Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Wilmington Residents
- Estimated remediation: $1,250 per household.
- CDC health risk index: 10.71.
Wilmington's Water Providers
Wilmington, CA draws its water from one primary utility across 1 tracked system.
Overview
We track water quality and home safety data for 2 ZIP codes in Wilmington, California (population ~53,678), covering 1 community water system serving approximately 3,875,566 people region-wide.
No EPA violations recorded across any ZIP codes in Wilmington — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Wilmington: C (58/100)
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
Wilmington water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Wilmington
- 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 |
|---|---|---|---|
| 90744 | C | LOS ANGELES-CITY, DEPT. OF WATER & POWER | 3,875,566 |
| 90748 | D | LOS ANGELES-CITY, DEPT. OF WATER & POWER | 3,875,566 |
All ZIP Codes in Wilmington
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.
Wilmington 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 Wilmington
When estimated remediation is placed alongside median property values in Wilmington, the resulting ratio is low — a finding consistent with a household financial perspective where documented issues can be addressed without a meaningful impact on overall equity position, making this market one of the more favorable contexts for remediation planning.
Remediation costs in Wilmington are relatively low compared to home values. The $550–$2,100 estimated range is a small fraction of median property value. Home values are 19% below the California average.
Wilmington: Flood History & Water Damage Risk
Multiple flood events have been recorded for Wilmington through the NFIP — 2 claims in total, with 50% of ZIP codes in FEMA-designated zones — pointing to a flood exposure profile that merits inclusion in a water quality assessment without reaching high-severity planning territory.
Wilmington has a moderate flood history with 2 FEMA claims averaging $11,869 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>$1,250</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 Wilmington
- 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 Wilmington, CA