Westley, CA Water Safety: 73/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
In current tracking cycles, Westley records above-average water quality outcomes for CA; compliance history over recent years shows few departures from federal standards and no systemic failures across its water systems.
How Westley Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Westley Residents
- Homes built before 1986: 50% — older plumbing may contain lead solder.
- Estimated remediation: $2,500 per household.
- CDC health risk index: 12.27 — above typical levels.
Westley's Water Providers
2 independent water providers serve Westley, CA — 2 systems appear in federal records.
Overview
We track water quality and home safety data for 1 ZIP code in Westley, California (population ~1,187), covering 2 community water systems serving approximately 25,304 people region-wide.
No EPA violations recorded across any ZIP codes in Westley — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Westley: B (73/100)
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
Westley water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Westley
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 95387 | B | Western Hills Water District/diablo Gran | 2,000 |
All ZIP Codes in Westley
- 95387 [B]
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.
Westley 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
Westley Infrastructure Age
With 50% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Because the majority of Westley's housing predates 1986, when lead solder was banned from new plumbing, the median build year of 1983 reflects a city where lead-era plumbing materials are common rather than exceptional.
Over half of homes in Westley were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
How Remediation Costs Compare in Westley
Given current Westley valuations, the remediation-to-property-value ratio is low — most homeowners are looking at a proportionally modest share that fits within routine financial planning.
Remediation costs in Westley are relatively low compared to home values. The $1,800–$4,000 estimated range is a small fraction of median property value. Home values are 53% below the California average.
Westley: Lead Risk & Vulnerable Populations
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.
Older stock in Westley represents 50% of the inventory, and citywide monitoring runs at or above the federal action level — making an in-home read a standard household-level step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Westley: Flood History & Water Damage Risk
Within the NFIP's national dataset, Westley falls in moderate-exposure territory — 2 documented incidents spanning multiple decades, with 100% of local ZIP codes sitting inside FEMA flood boundaries. That combination warrants inclusion in any thorough local water quality review.
Westley has a moderate flood history with 2 FEMA claims averaging $81,682 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>$2,500</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 Westley, CA