Lead in Palo Alto, CA Drinking Water
Lead data for Palo Alto, California · 70,020 residents · 6 ZIP codes
If you rely on a public water system in Palo Alto, California, Lead is a contaminant your utility has been required to test for — and EPA records show it has been detected at measurable levels, making it worth understanding as part of your tap water's detection record.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Lead in Palo Alto Tap Water
Lead has been detected in Palo Alto, California drinking water at a maximum level of 1.1 ppb — below the EPA action level of 15 ppb (action level).
This analysis covers 70,020 residents across 6 ZIP codes in Palo Alto.
Palo Alto's overall water quality grade is B (78/100).
Is Lead in Palo Alto Water Safe?
Lead was detected in Palo Alto water but currently falls within EPA limits. However, some health organizations argue the EPA action level may not be protective enough — the CDC states there is no safe level of lead for children.
If you are concerned, a reverse osmosis or nsf 53 carbon block filter can reduce lead levels further.
Lead Levels by ZIP Code
| ZIP Code | Lead Level | EPA Limit | Status |
|---|---|---|---|
| 94301 | 1.1 ppb | 15 ppb (action level) | OK |
| 94302 | 1.1 ppb | 15 ppb (action level) | OK |
| 94303 | 1.1 ppb | 15 ppb (action level) | OK |
| 94304 | 1.1 ppb | 15 ppb (action level) | OK |
| 94306 | 1.1 ppb | 15 ppb (action level) | OK |
| 94309 | 1.1 ppb | 15 ppb (action level) | OK |
Average lead level across Palo Alto: 1.1 ppb
Health Effects of Lead
- Brain development delays and reduced IQ in children
- Behavioral problems and learning disabilities
- High blood pressure and kidney damage in adults
- Increased risk of premature birth in pregnant women
Health risk severity: High. Governed by the Lead and Copper Rule Revisions (LCRR/LCRI).
How Lead Gets Into Drinking Water
- Corrosion of lead service lines (pipes connecting water main to home)
- Lead solder in copper plumbing joints (pre-1986 homes)
- Brass fixtures and faucets manufactured before 2014
- Stagnant water that sits in lead-containing pipes overnight
What to Do About Lead in Palo Alto Water
- Install an NSF 53 or NSF 58 certified filter at kitchen sink
- Run cold water for 30 seconds before using for drinking or cooking
- Use cold water only for cooking and preparing formula
- Consider whole-home reverse osmosis if lead service line is present
Look for filters certified under NSF 53 / NSF 58 for lead removal.