Lead in Porterville, CA Drinking Water
Lead data for Porterville, California · 80,581 residents · 2 ZIP codes
ZipCheckup's reading of Lead in Porterville, California: the highest detected level is 3 ppb; the EPA limit is 15 ppb (action level). Lead carries a high health-risk designation.
Across the water systems that serve Porterville, California, Lead has appeared in EPA compliance samples - standard municipal treatment targets this contaminant, though detections in the compliance record indicate it has reached household taps at measurable levels.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13
Lead in Porterville Tap Water
Lead has been detected in Porterville, California drinking water at a maximum level of 3 ppb — below the EPA action level of 15 ppb (action level).
This analysis covers 80,581 residents across 2 ZIP codes in Porterville.
Porterville's overall water quality grade is B (71/100).
Is Lead in Porterville Water Safe?
If you live in an affected ZIP code, consider installing a reverse osmosis or nsf 53 carbon block filter certified under NSF 53 / NSF 58 and testing your water independently.
Lead Levels by ZIP Code
| ZIP Code | Lead Level | EPA Limit | Status |
|---|---|---|---|
| 93257 | 3 ppb | 15 ppb (action level) | OK |
| 93258 | 3 ppb | 15 ppb (action level) | OK |
Average lead level across Porterville: 3 ppb
EPA Violations for Lead in Porterville
| Date | Violation Type | Status | ZIP Code |
|---|---|---|---|
| 2024-04-01 | Lead (Known) | Known | 93257 |
| 2023-08-01 | Lead (Known) | Known | 93257 |
| 2023-07-01 | Lead (Known) | Known | 93257 |
| 2023-06-01 | Lead (Known) | Known | 93257 |
| 2023-01-01 | Lead (Known) | Known | 93257 |
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 Porterville 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.