Arsenic in San Bernardino, CA Drinking Water
Arsenic data for San Bernardino, California · 255,071 residents · 18 ZIP codes
ZipCheckup's reading of Arsenic in San Bernardino, California: the highest detected level is 8.4 ppb; the EPA limit is 10 ppb. Arsenic carries a high health-risk designation.
Water quality records for San Bernardino, California show Arsenic detections on file - a finding that places it among the contaminants worth tracking for this area.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13
Arsenic in San Bernardino Tap Water
Arsenic has been detected in San Bernardino, California drinking water at a maximum level of 8.4 μg/L — relative to the EPA MCL of 10 ppb.
This analysis covers 255,071 residents across 18 ZIP codes in San Bernardino.
San Bernardino's overall water quality grade is B (72/100).
Is Arsenic in San Bernardino Water Safe?
Arsenic was detected in San Bernardino water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.
If you are concerned, a reverse osmosis filter can reduce arsenic levels further.
Arsenic Levels by ZIP Code
| ZIP Code | Arsenic Level | EPA Limit | Status |
|---|---|---|---|
| 92401 | 8.4 μg/L | 10 ppb | Not comparable |
| 92402 | 8.4 μg/L | 10 ppb | Not comparable |
| 92403 | 8.4 μg/L | 10 ppb | Not comparable |
| 92404 | 8.4 μg/L | 10 ppb | Not comparable |
| 92405 | 8.4 μg/L | 10 ppb | Not comparable |
| 92406 | 8.4 μg/L | 10 ppb | Not comparable |
| 92407 | 8.4 μg/L | 10 ppb | Not comparable |
| 92408 | 8.4 μg/L | 10 ppb | Not comparable |
| 92410 | 8.4 μg/L | 10 ppb | Not comparable |
| 92411 | 8.4 μg/L | 10 ppb | Not comparable |
| 92412 | 8.4 μg/L | 10 ppb | Not comparable |
| 92413 | 8.4 μg/L | 10 ppb | Not comparable |
| 92414 | 8.4 μg/L | 10 ppb | Not comparable |
| 92415 | 8.4 μg/L | 10 ppb | Not comparable |
| 92418 | 8.4 μg/L | 10 ppb | Not comparable |
| 92423 | 8.4 μg/L | 10 ppb | Not comparable |
| 92424 | 8.4 μg/L | 10 ppb | Not comparable |
| 92427 | 8.4 μg/L | 10 ppb | Not comparable |
Average arsenic level across San Bernardino: 8.4 ppb
Health Effects of Arsenic
- Increased risk of skin, bladder, lung, and kidney cancer
- Cardiovascular disease and type 2 diabetes
- Skin changes (darkening, thickening, lesions)
- Developmental effects in children exposed in utero
Health risk severity: High. Governed by the Arsenic Rule (2006).
How Arsenic Gets Into Drinking Water
- Natural deposits in rock and soil (especially in western U.S.)
- Runoff from orchards and glass/electronics production
- Historical use of arsenic-based pesticides
- Well water in areas with arsenic-rich geology
What to Do About Arsenic in San Bernardino Water
- Install a reverse osmosis (RO) system certified under NSF 58
- Adsorptive media filters (iron-based) can also reduce arsenic
- Have well water tested if on a private supply
- Boiling water does NOT remove arsenic — it concentrates it
Look for filters certified under NSF 53 / NSF 58 for arsenic removal.