Home hazard report for 94305 — Stanford, CA
ZIP 94305 is served by Stanford University: 1 violation since 2016, latest lead result 0 ppb, PFAS not detected. Santa Clara County is in EPA radon zone 2.
Health-based violations since 2016: Total Haloacetic Acids (Haa5). All are listed as resolved.
90th-percentile lead in the latest round (Jan 2022). Lead comes mostly from household plumbing and service lines, so individual homes can be higher.
None of the tested PFAS were found above EPA’s reporting limits in 2023–2025.
Predicted average indoor radon between 2 and 4 pCi/L. Test your home; many homes here exceed 4 pCi/L.
FEMA’s overall natural-hazard risk for this census tract, relative to the rest of the U.S.
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code.
Active weather alerts
live from the National Weather ServiceChecking the National Weather Service…
Where ZIP 94305 is
Dashed: ZIP area · blue: utility service area · scroll or pinch to zoomDrinking water: Stanford University
Health-based violations
| Contaminant or rule | Health-based violations since 2016 |
|---|---|
| Total Haloacetic Acids (Haa5) | 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 Oct 2016.
Full record for Stanford University →
Other systems overlapping this ZIP: City of Palo Alto, Santa Clara Valley Water District.
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 |
|---|---|---|---|
| HFPO-DA (GenX) | not detected | 0 of 4 | — |
| PFBA | not detected | 0 of 4 | — |
| PFHxA | not detected | 0 of 4 | — |
| PFDA | not detected | 0 of 4 | — |
| PFOA | not detected | 0 of 4 | 4 ppt MCL |
| PFOS | not detected | 0 of 4 | 4 ppt MCL |
| PFNA | not detected | 0 of 4 | — |
| PFHpA | not detected | 0 of 4 | — |
| PFBS | not detected | 0 of 4 | — |
| PFPeA | not detected | 0 of 4 | — |
| PFHxS | not detected | 0 of 4 | — |
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 Santa Clara County
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 →
Natural hazard risk
FEMA rates the overall natural-hazard risk of this neighborhood (census tract) as Relatively Moderate, with very high social vulnerability and relatively high 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
| Site | Status | Distance |
|---|---|---|
| Hewlett-Packard (620-640 Page Mill Road) Palo Alto, California · EPA ID CAD980884209 | Active (final NPL) | 1.5 mi |
| CTS Printex, Inc. Mountain View, California · EPA ID CAD009212838 | Active (final NPL) | 4.6 mi |
| JASCO Chemical Corp. Mountain View, California · EPA ID CAD009103318 | Cleaned up & deleted | 4.7 mi |
| Teledyne Semiconductor Mountain View, California · EPA ID CAD009111444 | Active (final NPL) | 5.0 mi |
| Spectra-Physics, Inc. Mountain View, California · EPA ID CAD009138488 | Active (final NPL) | 5.1 mi |
| Intel Corp. (Mountain View Plant) Mountain View, California · EPA ID CAD061620217 | Active (final NPL) | 6.5 mi |
| Fairchild Semiconductor Corp. (Mountain View Plant) Mountain View, California · EPA ID CAD095989778 | Active (final NPL) | 6.5 mi |
| Moffett Naval Air Station Sunnyvale, California · EPA ID CA2170090078 | Active (final NPL) | 6.5 mi |
| Raytheon Corp. Mountain View, California · EPA ID CAD009205097 | Active (final NPL) | 6.6 mi |
| Westinghouse Electric Corp. (Sunnyvale Plant) Sunnyvale, California · EPA ID CAD001864081 | Active (final NPL) | 8.6 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 94305
Who supplies drinking water to ZIP 94305?
Stanford University (EPA ID CA4310013), a surface water (rivers, lakes) system serving about 23,817 people.
Is there lead in Stanford, CA tap water?
The utility’s latest 90th-percentile lead result (Jan 2022) 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 Stanford, CA water have PFAS?
None of the tested PFAS were found above EPA’s reporting limits in 2023–2025.
Has the water system in 94305 had violations?
Health-based violations since 2016: Total Haloacetic Acids (Haa5). All are listed as resolved.
What natural hazards affect ZIP 94305?
FEMA’s National Risk Index rates the overall natural-hazard risk here as Relatively Moderate; the highest-rated hazards are earthquake (relatively high), drought (relatively low), heat wave (relatively low).
Are there Superfund sites near 94305?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: Hewlett-Packard (620-640 Page Mill Road) (1.5 mi, Active (final NPL)); CTS Printex, Inc. (4.6 mi, Active (final NPL)); JASCO Chemical Corp. (4.7 mi, Cleaned up & deleted).
Is radon a problem in Santa Clara County?
Santa Clara County 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.