How much arsenic is in Sebastopol water?

The maximum detected level of arsenic in Sebastopol water is 5.86 ppb. The EPA limit is 10 ppb. See the ZIP code table above for area-specific levels.

Detected Arsenic

Arsenic in Sebastopol, CA Drinking Water

Q: Is arsenic in Sebastopol water safe?

Arsenic was detected in Sebastopol water at 5.86 ppb, below the EPA limit of 10 ppb. Check ZIP-level data on this page for your specific area.

Arsenic data for Sebastopol, California · 28,588 residents · 2 ZIP codes

ZipCheckup's reading of Arsenic in Sebastopol, California: the highest detected level is 5.86 ppb; the EPA limit is 10 ppb. Arsenic carries a high health-risk designation.

Arsenic exposure in drinking water is tracked by EPA across the country; households in Sebastopol, California are among those with confirmed detections in the public water record.

5.86 ppb

Max Level Detected

5.86 ppb

Average Level

10 ppb

EPA MCL

High

Health Risk

Reverse Osmosis

Best Filter Method

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-07-13

Arsenic in Sebastopol Tap Water

Arsenic has been detected in Sebastopol, California drinking water at a maximum level of 5.86 ppb — below the EPA MCL of 10 ppb.

This analysis covers 28,588 residents across 2 ZIP codes in Sebastopol.

Sebastopol's overall water quality grade is A (88/100).

Is Arsenic in Sebastopol Water Safe?

Arsenic was detected in Sebastopol 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
95472	5.86 ppb	10 ppb	OK
95473	5.86 ppb	10 ppb	OK

Average arsenic level across Sebastopol: 5.86 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 Sebastopol 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.

Home → Contaminants → Arsenic → California → Sebastopol

How to cite this page

APA ZipCheckup. (2026). Arsenic in Sebastopol, CA Drinking Water. https://zipcheckup.com/contaminants/arsenic/sebastopol-ca/

BibTeX

@misc{zipcheckup-contaminants-arsenic-sebastopol-ca,
  author = {{ZipCheckup}},
  title  = {{Arsenic in Sebastopol, CA Drinking Water}},
  year   = {2026},
  url    = {https://zipcheckup.com/contaminants/arsenic/sebastopol-ca/}
}

Data as of July 2026.