West Covina, CA Water Safety: 72/100 (2026)
4 ZIP codes · 11 water systems · Updated 2026-06-03
Residents of West Covina generally live with tap water that beats the CA safety average on key EPA compliance metrics.
How West Covina Compares
Data: EPA SDWIS Last verified: 2026-06-03
West Covina Water: The Quick Version
- Homes built before 1986: 84% — older plumbing may contain lead solder.
- Estimated remediation: $1,575 per household.
- CDC health risk index: 10.71.
Water Systems Serving West Covina
Federal records list 11 water systems tied to West Covina, CA. Of those, 3 are the primary providers, meaning service conditions, rate structures, and compliance histories can differ depending on where a property sits.
Overview
We track water quality and home safety data for 4 ZIP codes in West Covina, California (population ~109,033), covering 11 community water systems serving approximately 848,972 people region-wide.
No EPA violations recorded across any ZIP codes in West Covina — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for West Covina: B (72/100)
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
West Covina water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for West Covina
- 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 |
|---|---|---|---|
| 91790 | B | San Gabriel Valley Water Company-el Monte | 248,000 |
| 91791 | B | Valencia Heights Water Company | 7,775 |
| 91792 | B | Suburban Water Systems-san Jose | 168,843 |
| 91793 | B | Valencia Heights Water Company | 7,775 |
All ZIP Codes in West Covina
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.
CDC Health Data for West Covina
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 Old Is West Covina's Housing Stock?
With 84% 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
The median home in West Covina was built in 1964 — a figure that places most of the city's residential stock in the era when lead solder was still standard in copper plumbing. Homes built before 1986 may have lead-soldered joints; those built before 1970 face the additional possibility of lead pipes in the service line itself.
Over half of homes in West Covina 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.
West Covina: Remediation Cost in Perspective
While no remediation project is entirely without cost, the relationship between estimated remediation and property values in West Covina is notably favorable — the equity share is small enough that the household financial perspective is one of proportionality rather than pressure, and most homeowners can treat it as routine planning rather than a significant financial event.
Remediation costs in West Covina are relatively low compared to home values. The $775–$2,475 estimated range is a small fraction of median property value. Home values are 6% below the California average.
Protecting Children from Lead in West Covina
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.
84% — that captures the slice of West Covina housing dating from before the federal ban on solder containing lead. It pairs with aggregate utility readings that either approach or cross 0.015 mg/L, the benchmark set under the EPA Lead and Copper Rule. Together, the two figures shift one-home reads into a standard household-level confirmation, particularly for families with kids. A certified lead-removal filter is available through retailer-verified channels if a kit returns results that warrant additional measures.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for West Covina
50% of ZIP codes in West Covina are mapped into FEMA-designated flood zones, and the NFIP records 19 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.
West Covina has a moderate flood history with 19 FEMA claims averaging $6,368 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>$1,575</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 West Covina, CA