Home hazard report for 94042 — Mountain View, CA
ZIP 94042 is served by City of Mountain View (as listed by the state): no health-based violations since 2016, latest lead result 0 ppb, PFAS not detected. Santa Clara is in EPA radon zone 2.
No health-based violations reported since 2016.
90th-percentile lead in the latest round (Jan 2023). 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.
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code.
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Where ZIP 94042 is
blue: utility service area · scroll or pinch to zoomDrinking water: City of Mountain View
Health-based violations
No health-based violations reported since 2016.
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 |
|---|---|---|---|
| PFHxA | not detected | 0 of 14 | — |
| PFBS | not detected | 0 of 14 | — |
| PFHpA | not detected | 0 of 14 | — |
| PFHxS | not detected | 0 of 14 | — |
| PFNA | not detected | 0 of 14 | — |
| PFOS | not detected | 0 of 14 | 4 ppt MCL |
| PFOA | not detected | 0 of 14 | 4 ppt MCL |
| PFDA | not detected | 0 of 14 | — |
| PFBA | not detected | 0 of 14 | — |
| HFPO-DA (GenX) | not detected | 0 of 14 | — |
| PFPeA | not detected | 0 of 14 | — |
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
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 |
|---|---|---|
| JASCO Chemical Corp. Mountain View, California · EPA ID CAD009103318 | Cleaned up & deleted | <1 mi |
| Spectra-Physics, Inc. Mountain View, California · EPA ID CAD009138488 | Active (final NPL) | 1.5 mi |
| Intel Corp. (Mountain View Plant) Mountain View, California · EPA ID CAD061620217 | Active (final NPL) | 1.7 mi |
| Teledyne Semiconductor Mountain View, California · EPA ID CAD009111444 | Active (final NPL) | 1.7 mi |
| Raytheon Corp. Mountain View, California · EPA ID CAD009205097 | Active (final NPL) | 1.9 mi |
| Fairchild Semiconductor Corp. (Mountain View Plant) Mountain View, California · EPA ID CAD095989778 | Active (final NPL) | 1.9 mi |
| CTS Printex, Inc. Mountain View, California · EPA ID CAD009212838 | Active (final NPL) | 2.1 mi |
| Moffett Naval Air Station Sunnyvale, California · EPA ID CA2170090078 | Active (final NPL) | 2.5 mi |
| Westinghouse Electric Corp. (Sunnyvale Plant) Sunnyvale, California · EPA ID CAD001864081 | Active (final NPL) | 3.4 mi |
| Hewlett-Packard (620-640 Page Mill Road) Palo Alto, California · EPA ID CAD980884209 | Active (final NPL) | 4.1 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 94042
Who supplies drinking water to ZIP 94042?
City of Mountain View (EPA ID CA4310007), a surface water (rivers, lakes) system serving about 81,340 people, listed by the state as serving this ZIP code.
Is there lead in Mountain View, CA 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 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 94042 had violations?
No health-based violations reported since 2016.
Are there Superfund sites near 94042?
Active or proposed Superfund (National Priorities List) sites near the center of this ZIP code. Sites within 10 miles: JASCO Chemical Corp. (0.9 mi, Cleaned up & deleted); Spectra-Physics, Inc. (1.5 mi, Active (final NPL)); Intel Corp. (Mountain View Plant) (1.7 mi, Active (final NPL)).
Is radon a problem in Santa Clara?
Santa Clara 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.