ZipCheckup grade for 91791: C.
A mixed picture - some signals here are worth your attention.
Your top priority: have older plumbing checked for lead solder. Check your ZIP → EPA: reduce lead
West Covina, CA (91791): PFAS Detected in Mapped Water Systems - 58/100
EPA data combined for 6 water systems mapped to this ZIP (largest mapped system: Suburban Water Systems-san Jose)
EPA records for the water systems mapped to 91791 in West Covina, CA contain 1 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 0 are marked health-based.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water EPA records for water systems mapped to this ZIP show 1 violation (non-health) (since 2021).
- Lead The reported 90th-percentile lead result is below the laboratory reporting limit, not a measured zero; EPA's health goal for lead is zero.
- PFAS At least one PFAS result is above an EPA MCL value (UCMR5 sampling; MCL compliance required from 2029).
- Radon EPA Zone 2 - county-level radon potential, not a home measurement.
- Flood 8 cumulative NFIP claim records. Claim evidence is historical, not current map coverage.
Get updates when new water-quality data is available for your area
Free alerts when new EPA data affects ZIP code 91791. No spam - just safety updates.
Unsubscribe anytime. We only send updates when your safety score changes. See our Privacy Policy.
See incorrect data? Let us know
West Covina (91791): one critical alert.
Score Breakdown
Overall Home Safety Score: 58/100
This is the published model score. Component and domain values are shown independently; they are not added together on this page.
Canonical components
Required domains
Coverage: 4 of 4 components and 3 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (7) HIGH
Your Water System
ZIP code 91791 in West Covina, California is mapped to the water system Suburban Water Systems-san Jose (EPA ID: CA1910205). This system provides water to approximately 168,843 people from surface water sources.
There are 6 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| Suburban Water Systems-san Jose | CA1910205 | 168,843 | Surface water |
| Valencia Heights Water Company | CA1910163 | 7,775 | Surface water |
| Azusa Light and Water | CA1910007 | 110,044 | Surface water |
| Covina-city, Water Department | CA1910127 | 33,300 | Surface water |
| Suburban Water Systems-covina Knolls | CA1910200 | 1,437 | Surface water |
Other Water Quality Reports in California
- 90001 (Los Angeles)
- 90002 (Los Angeles)
- 90003 (Los Angeles)
- 90004 (Los Angeles)
- 90005 (Los Angeles)
- 90006 (Los Angeles)
- 90007 (Los Angeles)
- 90008 (Los Angeles)
- 90009 (Los Angeles)
- 90010 (Los Angeles)
- 90011 (Los Angeles)
- 90012 (Los Angeles)
- 90013 (Los Angeles)
- 90014 (Los Angeles)
- 90015 (Los Angeles)
- 90016 (Los Angeles)
- 90017 (Los Angeles)
- 90018 (Los Angeles)
- 90019 (Los Angeles)
- 90020 (Los Angeles)
Nearby Water Quality Reports
- 91723 (Covina) - 2 mi
- 91790 (West Covina) - 2 mi - 1 violation recorded for mapped water systems
- 91722 (Covina) - 2 mi
- 91793 (West Covina) - 2 mi
- 91792 (West Covina) - 3 mi - 1 violation recorded for mapped water systems
- 91724 (Covina) - 3 mi - 1 violation recorded for mapped water systems
- 91744 (La Puente) - 3 mi - 1 violation recorded for mapped water systems
- 91788 (Walnut) - 4 mi
- 91797 (Pomona) - 4 mi
- 91789 (Walnut) - 4 mi - 1 violation recorded for mapped water systems
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Suburban Water Systems-san Jose (CA1910205) on EPA.gov.
3 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.
PFAS Contamination Detected
PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 91791. One or more compound results are above the level of a federal PFAS MCL with compliance required from 2029.
Detected compounds: PFOA, PFBA, PFOS, PFBS, PFHxA, PFPeA, PFHxS.
Highest measured level: 0.0077 µg/L
Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.
Environmental Hazards (11) CRITICAL
Home & Infrastructure (6) OK
Cost & Community (9) HIGH
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in West Covina
Based on local data for ZIP 91791, these services may benefit homeowners in your area.
Based on local data for your area. Use the tools below to explore your options.
Home & Flood Insurance
The ZIP code for this report in West Covina has 8 FEMA flood claims on record. Standard homeowner policies don't cover flood damage - make sure you're protected.
Typical cost: Flood insurance: premiums vary by property and flood zone; request a quote
Check Your Flood Zone (Free)FEMA flood map lookup - see if your property is in a flood zone
Free tip: Check your FEMA flood zone at msc.fema.gov (free lookup)
Gutter Installation & Repair
The median home in 91791 was built around 1965. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.
Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home
Estimate Your Home Maintenance CostsWindow Replacement
The median build year of homes in West Covina is 1965; check the age and condition of your own windows. ENERGY STAR windows can save $101–$583/year on energy bills.
Typical cost: Window replacement: typically $300–$800 per window installed
Estimate Your Home Maintenance CostsRoofing Inspection & Repair
Homes built around 1965 may be on their second or third roof. A professional inspection can catch damage before leaks start.
Typical cost: Roof inspection: typically $75–$300; repairs $300–$1,500
Estimate Your Home Insurance NeedsService recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.
Frequently Asked Questions
Is the tap water in 91791 safe to drink?
EPA SDWIS records 1 violation since 2021 across the water systems mapped to ZIP 91791 (primary system: Suburban Water Systems-san Jose), including 0 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.
Where does 91791's water come from?
The recorded water source for Suburban Water Systems-san Jose, a system mapped to ZIP code 91791, is Surface water. This system serves approximately 168,843 people.
How does West Covina water compare to the national average?
West Covina's Home Safety Score ranks lower than 85% of U.S. ZIP codes, and lower than 95% of ZIP codes within California.
How can I get my water tested in West Covina?
If Suburban Water Systems-san Jose supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.
What is the radon risk for 91791?
91791 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in Los Angeles County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
Are there PFAS (forever chemicals) in 91791's water?
Yes, PFAS have been detected in samples from water systems mapped to 91791. One or more PFAS results are above the level of a federal PFAS MCL with compliance required from 2029. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.
What does the NFIP claim history show for ZIP 91791?
FEMA records contain 8 flood insurance claims filed in ZIP code 91791; the recorded rated-zone value (the most frequent one if there are several claims) is A, which is claims evidence and may differ from the current FEMA map zone for a property. Claim records do not establish current property risk. Review FEMA's map for the specific property.
How to cite this page
ZipCheckup. (2026). West Covina, CA (91791): PFAS Detected in Mapped Water Systems - 58/100. https://zipcheckup.com/report/91791/
@misc{zipcheckup-report-91791,
author = {{ZipCheckup}},
title = {{West Covina, CA (91791): PFAS Detected in Mapped Water Systems - 58/100}},
year = {2026},
url = {https://zipcheckup.com/report/91791/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 91791
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 91723 | Covina, CA | 1.6 mi | C | 0 |
| 91790 | West Covina, CA | 2.2 mi | C | 1 |
| 91722 | Covina, CA | 2.3 mi | C | 0 |
| 91793 | West Covina, CA | 2.4 mi | N/A | 0 |
| 91792 | West Covina, CA | 2.9 mi | B | 1 |
| 91724 | Covina, CA | 3.1 mi | C | 1 |
| 91744 | La Puente, CA | 3.4 mi | B | 1 |
| 91788 | Walnut, CA | 3.6 mi | N/A | 0 |
| 91797 | Pomona, CA | 3.7 mi | N/A | 0 |
| 91789 | Walnut, CA | 4.1 mi | C | 1 |
Nearby ZIP Code Reports
2026 Rankings for Your Area
Overall safety breakdown
Home Safety Score →Find the right water filter
Water Filter Matcher →Compare filters, tests & services
Compare My Options →Compare with another ZIP
Compare Tool →