Home hazard report for 94043 — Mountain View, CA
ZIP 94043 is served by Nasa Ames Research Center: no health-based violations since 2016, latest lead result 10.4 ppb, PFAS not detected. Santa Clara County is in EPA radon zone 2.
No health-based violations reported since 2016.
Below the current 15 ppb action level but above 10 ppb, the action level under EPA's Lead and Copper Rule Improvements (compliance from 2027). Latest round: Jan 2021.
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
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Where ZIP 94043 is
Dashed: ZIP area · blue: utility service area · scroll or pinch to zoomDrinking water: Nasa Ames Research Center
Health-based violations
No health-based violations reported since 2016.
Full record for Nasa Ames Research Center →
Other systems overlapping this ZIP: Santa Clara Valley Water District, City of Mountain View.
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 |
|---|---|---|---|
| PFNA | 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 |
| PFHxS | not detected | 0 of 4 | — |
| PFHpA | not detected | 0 of 4 | — |
| PFBS | not detected | 0 of 4 | — |
| PFPeA | not detected | 0 of 4 | — |
| PFBA | not detected | 0 of 4 | — |
| HFPO-DA (GenX) | 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 High, with relatively low 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 |
|---|---|---|
| Spectra-Physics, Inc. Mountain View, California · EPA ID CAD009138488 | Active (final NPL) | <1 mi |
| Teledyne Semiconductor Mountain View, California · EPA ID CAD009111444 | Active (final NPL) | <1 mi |
| Moffett Naval Air Station Sunnyvale, California · EPA ID CA2170090078 | Active (final NPL) | <1 mi |
| CTS Printex, Inc. Mountain View, California · EPA ID CAD009212838 | Active (final NPL) | 1.1 mi |
| Fairchild Semiconductor Corp. (Mountain View Plant) Mountain View, California · EPA ID CAD095989778 | Active (final NPL) | 1.1 mi |
| Intel Corp. (Mountain View Plant) Mountain View, California · EPA ID CAD061620217 | Active (final NPL) | 1.3 mi |
| Raytheon Corp. Mountain View, California · EPA ID CAD009205097 | Active (final NPL) | 1.3 mi |
| JASCO Chemical Corp. Mountain View, California · EPA ID CAD009103318 | Cleaned up & deleted | 1.4 mi |
| Westinghouse Electric Corp. (Sunnyvale Plant) Sunnyvale, California · EPA ID CAD001864081 | Active (final NPL) | 3.4 mi |
| TRW Microwave, Inc. (Building 825) Sunnyvale, California · EPA ID CAD009159088 | Active (final NPL) | 3.8 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 94043
Who supplies drinking water to ZIP 94043?
Nasa Ames Research Center (EPA ID CA4300997), a surface water (rivers, lakes) system serving about 1,200 people.
Is there lead in Mountain View, CA tap water?
The utility’s latest 90th-percentile lead result (Jan 2021) was 10.4 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 Mountain View, CA water have PFAS?
None of the tested PFAS were found above EPA’s reporting limits in 2023–2025.
Has the water system in 94043 had violations?
No health-based violations reported since 2016.
What natural hazards affect ZIP 94043?
FEMA’s National Risk Index rates the overall natural-hazard risk here as Relatively High; the highest-rated hazards are coastal flooding (very high), earthquake (very high), riverine flooding (relatively moderate).
Are there Superfund sites near 94043?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: Spectra-Physics, Inc. (0.6 mi, Active (final NPL)); Teledyne Semiconductor (0.6 mi, Active (final NPL)); Moffett Naval Air Station (0.9 mi, Active (final NPL)).
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.