Not every city shows Arsenic in its water data; in Klamath Falls, Oregon, federal sampling has confirmed its presence at detectable levels in at least one recent reporting cycle.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14

Arsenic in Klamath Falls Tap Water

Arsenic has been detected in Klamath Falls, Oregon drinking water at a maximum level of 0.00771 ppb — below the EPA MCL of 10 ppb.

This analysis covers 42,304 residents across 3 ZIP codes in Klamath Falls.

Klamath Falls's overall water quality grade is B (78/100).

Is Arsenic in Klamath Falls Water Safe?

Arsenic was detected in Klamath Falls 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 Klamath Falls: 0.01 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 Klamath Falls 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 Oregon
• Oregon Water Quality
• Klamath Falls Water Quality
• Check Your ZIP Code