Arsenic in Twentynine Palms, CA Drinking Water
Arsenic data for Twentynine Palms, California · 18,795 residents · 2 ZIP codes
Routine testing in Twentynine Palms, California turned up Arsenic — samples from the public supply came back positive, placing this contaminant on the list of substances residents here have a concrete reason to look into.
Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14
Arsenic in Twentynine Palms Tap Water
Arsenic has been detected in Twentynine Palms, California drinking water at a maximum level of 5.58 ppb — below the EPA MCL of 10 ppb.
This analysis covers 18,795 residents across 2 ZIP codes in Twentynine Palms.
Twentynine Palms's overall water quality grade is C (69/100).
Is Arsenic in Twentynine Palms Water Safe?
Arsenic was detected in Twentynine Palms 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
Average arsenic level across Twentynine Palms: 5.58 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 Twentynine Palms 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.