Home hazard report for 78586 — San Benito, TX
ZIP 78586 is served by East Rio Hondo WSC: 1 violation since 2016, latest lead result 0 ppb, PFAS 5.6 ppt. Cameron County is in EPA radon zone 3.
Health-based violations since 2016: Long Term 2 Enhanced Surface Water Treatment Rule. All are listed as resolved.
90th-percentile lead in the latest round (Jan 2023). Lead comes mostly from household plumbing and service lines, so individual homes can be higher.
Highest PFOA or PFOS result in EPA’s 2023–2025 testing was at or above 4.0 ppt, EPA’s 2024 maximum contaminant level for each. 8 PFAS compounds detected.
Predicted average under 2 pCi/L — but any home can have high radon, so EPA still recommends a test.
FEMA’s overall natural-hazard risk for this census tract, relative to the rest of the U.S.
No active Superfund site within 10 miles of the ZIP center.
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Where ZIP 78586 is
Dashed: ZIP area · blue: utility service area · scroll or pinch to zoomDrinking water: East Rio Hondo WSC
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Long Term 2 Enhanced Surface Water Treatment Rule | 1 |
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 Nov 2016.
Full record for East Rio Hondo WSC →
Other systems overlapping this ZIP: Military Hwy WSC Las Rusias, City of San Benito.
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 | 14.8 ppt | 9 of 12 | — |
| PFPeA | 11.7 ppt | 9 of 12 | — |
| PFHxA | 11.2 ppt | 9 of 12 | — |
| PFOS | 5.6 ppt | 3 of 12 | 4 ppt MCL |
| PFOA | 5.4 ppt | 1 of 12 | 4 ppt MCL |
| PFHxS | 4.5 ppt | 2 of 12 | — |
| PFHpA | 4 ppt | 1 of 12 | — |
| PFBS | 3.5 ppt | 2 of 12 | — |
| HFPO-DA (GenX) | not detected | 0 of 12 | — |
| PFNA | not detected | 0 of 12 | — |
| PFDA | not detected | 0 of 12 | — |
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 Cameron County
EPA radon zone 3 — low potential. Predicted average under 2 pCi/L — but any home can have high radon, so EPA still recommends a test.
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 →
Natural hazard risk
FEMA rates the overall natural-hazard risk of this neighborhood (census tract) as Relatively Moderate, with very high social vulnerability and very low community resilience.
FEMA National Risk Index (December 2025): expected annual losses from each hazard combined with social vulnerability and community resilience, rated relative to all U.S. census tracts. Hazards not listed are not applicable here. It describes the area, not a single building; flood insurance maps (FEMA FIRMs) decide flood-insurance requirements.
Live conditions: river gauges and flood levels · tornado warnings · wildfire detections · earthquakes — our sister maps, updated from NOAA, USGS and NASA every few minutes.
Superfund sites nearby
No site on EPA’s Superfund National Priorities List lies within 10 miles of the center of this ZIP code.
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 78586
Who supplies drinking water to ZIP 78586?
East Rio Hondo WSC (EPA ID TX0310096), a surface water (rivers, lakes) system serving about 25,509 people.
Is there lead in San Benito, TX tap water?
The utility’s latest 90th-percentile lead result (Jan 2023) 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 San Benito, TX water have PFAS?
Highest PFOA or PFOS result in EPA’s 2023–2025 testing was at or above 4.0 ppt, EPA’s 2024 maximum contaminant level for each. 8 PFAS compounds detected.
Has the water system in 78586 had violations?
Health-based violations since 2016: Long Term 2 Enhanced Surface Water Treatment Rule. All are listed as resolved.
What natural hazards affect ZIP 78586?
FEMA’s National Risk Index rates the overall natural-hazard risk here as Relatively Moderate; the highest-rated hazards are cold wave (very high), hurricane (relatively high), drought (relatively moderate).
Are there Superfund sites near 78586?
No active Superfund site within 10 miles of the ZIP center.
Is radon a problem in Cameron County?
Cameron County is in EPA radon zone 3 (low potential). Predicted average under 2 pCi/L — but any home can have high radon, so EPA still recommends a test.