Arsenic in Boulder Creek, CA Drinking Water
Arsenic data for Boulder Creek, California · 25,972 residents · 1 ZIP code
People in Boulder Creek, California who get water from the public supply are among residents whose systems have returned Arsenic detections in EPA compliance testing.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Arsenic in Boulder Creek Tap Water
Arsenic has been detected in Boulder Creek, California drinking water at a maximum level of 5.6 ppb — below the EPA MCL of 10 ppb.
This analysis covers 25,972 residents across 1 ZIP code in Boulder Creek.
Boulder Creek's overall water quality grade is C (65/100).
Is Arsenic in Boulder Creek Water Safe?
Arsenic was detected in Boulder Creek 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 |
|---|---|---|---|
| 95006 | 5.6 ppb | 10 ppb | OK |
Average arsenic level across Boulder Creek: 5.6 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 Boulder Creek 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.