Because Arsenic is associated with health effects at sustained elevated exposures, residents in Ben Lomond, California may find it useful that local water systems have returned detectable concentrations — facts that bear on long-term household water decisions.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-06-04

Arsenic in Ben Lomond Tap Water

Arsenic has been detected in Ben Lomond, California drinking water at a maximum level of 5.6 ppb — below the EPA MCL of 10 ppb.

This analysis covers 7,150 residents across 1 ZIP code in Ben Lomond.

Ben Lomond's overall water quality grade is C (65/100).

Is Arsenic in Ben Lomond Water Safe?

Arsenic was detected in Ben Lomond 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 Ben Lomond: 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 Ben Lomond Water

1. Install a reverse osmosis (RO) system certified under NSF 58
2. Adsorptive media filters (iron-based) can also reduce arsenic
3. Have well water tested if on a private supply
4. Boiling water does NOT remove arsenic — it concentrates it

Look for filters certified under NSF 53 / NSF 58 for arsenic removal.

Related

• Arsenic — National Overview
• Arsenic in California
• California Water Quality
• Ben Lomond Water Quality
• Check Your ZIP Code