Home hazard report for 91735 — El Monte, CA
ZIP 91735 is served by San Gabriel Valley Water Co.-El Monte: 2 violations since 2016, latest lead result 0 ppb, PFAS 2 detected. Los Angeles is in EPA radon zone 2.
Health-based violations since 2016: Groundwater Rule. All are listed as resolved.
90th-percentile lead in the latest round (Jan 2024). Lead comes mostly from household plumbing and service lines, so individual homes can be higher.
PFAS were detected, with PFOA and PFOS below 4.0 ppt (highest not detected).
Predicted average indoor radon between 2 and 4 pCi/L. Test your home; many homes here exceed 4 pCi/L.
The nearest active Superfund site is 4.2 miles away.
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Where ZIP 91735 is
blue: utility service area · scroll or pinch to zoomDrinking water: San Gabriel Valley Water Co.-El Monte
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Groundwater Rule | 2 |
A health-based violation means a contaminant exceeded its legal limit (MCL) or a required treatment technique was not met, as reported by the state to EPA’s SDWIS. All are listed as resolved or archived; the latest began Jun 2019.
Lead
90th-percentile lead per sampling round (90% of the homes sampled were at or below this level). Black line: EPA’s 15 ppb action level; under the Lead and Copper Rule Improvements the action level becomes 10 ppb from 2027.
PFAS (“forever chemicals”)
| Compound | Highest result | Samples with detection | EPA limit |
|---|---|---|---|
| PFBA | 10 ppt | 1 of 18 | — |
| PFPeA | 5.6 ppt | 1 of 18 | — |
| PFOA | not detected | 0 of 18 | 4 ppt MCL |
| PFDA | not detected | 0 of 18 | — |
| HFPO-DA (GenX) | not detected | 0 of 18 | — |
| PFHxA | not detected | 0 of 18 | — |
| PFOS | not detected | 0 of 18 | 4 ppt MCL |
| PFNA | not detected | 0 of 18 | — |
| PFHxS | not detected | 0 of 18 | — |
| PFHpA | not detected | 0 of 18 | — |
| PFBS | not detected | 0 of 18 | — |
EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR 5), samples 2023–2025; ppt = parts per trillion (ng/L). The 4.0 ppt maximum contaminant levels for PFOA and PFOS were set by EPA in 2024; water systems have until the end of the decade to comply.
Radon in Los Angeles
EPA radon zone 2 — moderate potential. Predicted average indoor radon between 2 and 4 pCi/L. Test your home; many homes here exceed 4 pCi/L.
Radon is a colorless, odorless radioactive gas from soil and rock, and the leading cause of lung cancer among non-smokers. EPA recommends fixing a home at 4 pCi/L or above and considering it from 2 pCi/L. A short-term test kit costs about $15–30. How radon zones work →
Superfund sites nearby
| Site | Status | Distance |
|---|---|---|
| San Gabriel Valley (Area 1) El Monte, California · EPA ID CAD980677355 | Active (final NPL) | 4.2 mi |
| Operating Industries, Inc., Landfill Monterey Park, California · EPA ID CAT080012024 | Active (final NPL) | 5.1 mi |
| San Gabriel Valley (Area 2) Baldwin Park Area, California · EPA ID CAD980818512 | Active (final NPL) | 5.2 mi |
| San Gabriel Valley (Area 4) La Puente, California · EPA ID CAD980817985 | Active (final NPL) | 5.3 mi |
| San Gabriel Valley (Area 3) Alhambra, California · EPA ID CAD980818579 | Active (final NPL) | 6.0 mi |
| Omega Chemical Corporation Whittier, California · EPA ID CAD042245001 | Active (final NPL) | 6.9 mi |
| Waste Disposal, Inc. Santa Fe Springs, California · EPA ID CAD980884357 | Active (final NPL) | 8.3 mi |
EPA Superfund National Priorities List (NPL): the country’s most serious known hazardous-waste sites, each with an EPA cleanup record (linked). Distance is measured from the ZIP center to the site’s reference point; being near a site does not by itself mean exposure — EPA site pages describe what was found and how it is being cleaned up.
What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.
Questions about 91735
Who supplies drinking water to ZIP 91735?
San Gabriel Valley Water Co.-El Monte (EPA ID CA1910039), a groundwater (wells) system serving about 240,000 people.
Is there lead in El Monte, CA tap water?
The utility’s latest 90th-percentile lead result (Jan 2024) was 0 ppb; EPA’s action level is 15 ppb, falling to 10 ppb from 2027. Lead mostly comes from service lines and home plumbing, so the only way to know your tap is to test it.
Does El Monte, CA water have PFAS?
PFAS were detected, with PFOA and PFOS below 4.0 ppt (highest not detected).
Has the water system in 91735 had violations?
Health-based violations since 2016: Groundwater Rule. All are listed as resolved.
Are there Superfund sites near 91735?
The nearest active Superfund site is 4.2 miles away. Sites within 10 miles: San Gabriel Valley (Area 1) (4.2 mi, Active (final NPL)); Operating Industries, Inc., Landfill (5.1 mi, Active (final NPL)); San Gabriel Valley (Area 2) (5.2 mi, Active (final NPL)).
Is radon a problem in Los Angeles?
Los Angeles is in EPA radon zone 2 (moderate potential). Predicted average indoor radon between 2 and 4 pCi/L. Test your home; many homes here exceed 4 pCi/L.