Arsenic · Oregon

Arsenic in Oregon Drinking Water — 19 ZIPs Tested

EPA data analysis for arsenic in Oregon drinking water systems

ZipCheckup tracks Arsenic in Oregon drinking water: 19 ZIP codes with detected levels on record. 21 ZIP codes exceed the EPA limit (10 ppb). Arsenic carries a high health-risk designation.

19
ZIPs with Detections
21
ZIPs with Violations
4.4%
Violation Rate
10 ppb
EPA Limit
High
Health Risk
Reverse Osmosis
Best Filter Method

Arsenic Contamination in Oregon

ZipCheckup analyzed drinking water data across 482 ZIP codes in Oregon for arsenic contamination. 19 ZIP codes have reported arsenic detections, and 21 have EPA violations on record.

The violation rate for arsenic in Oregon is 4.4% of all ZIP codes — roughly in line with the national average.

EPA Standard for Arsenic

The EPA maximum contaminant level (MCL) for arsenic is 10 ppb, governed by the Arsenic Rule (2006). Water systems that exceed this limit must take corrective action and notify consumers.

Worst ZIP Codes for Arsenic in Oregon

These ZIP codes reported the highest arsenic levels in Oregon based on CCR reports and EPA data:

Lowest Arsenic Levels in Oregon

These ZIP codes had the lowest reported arsenic detections in Oregon:

Health Effects of Arsenic

Long-term exposure to arsenic in drinking water increases the risk of skin, bladder, lung, and kidney cancer. It also causes cardiovascular disease, diabetes, and skin lesions. The EPA classifies arsenic as a Group A human carcinogen.

How to Remove Arsenic From Drinking Water

The most effective treatment for arsenic removal is Reverse Osmosis. Look for filters certified under NSF 53 / NSF 58 standards.

Check Your ZIP Code

Use the ZipCheckup water quality search to see arsenic data for your specific water system in Oregon.

Worst ZIP Codes for Arsenic in Oregon

Ranked by highest arsenic detection level.

Rank ZIP Code City Level Detected EPA Limit Status
1 97003 Beaverton 900 ppb 10 ppb Exceeds
2 97005 Beaverton 900 ppb 10 ppb Exceeds
3 97006 Beaverton 900 ppb 10 ppb Exceeds
4 97007 Beaverton 900 ppb 10 ppb Exceeds
5 97008 Beaverton 900 ppb 10 ppb Exceeds
6 97062 Tualatin 900 ppb 10 ppb Exceeds
7 97075 Beaverton 900 ppb 10 ppb Exceeds
8 97076 Beaverton 900 ppb 10 ppb Exceeds
9 97077 Beaverton 900 ppb 10 ppb Exceeds
10 97078 First Consumers Nat Bank 900 ppb 10 ppb Exceeds
11 97224 Portland 900 ppb 10 ppb Exceeds
12 97030 Gresham 310 ppb 10 ppb Exceeds
13 97080 Gresham 310 ppb 10 ppb Exceeds
14 97753 Powell Butte 230 ppb 10 ppb Exceeds
15 97756 Redmond 230 ppb 10 ppb Exceeds
16 97601 Klamath Falls 7.71 ppb 10 ppb Within Limit
17 97602 Klamath Falls 7.71 ppb 10 ppb Within Limit
18 97603 Klamath Falls 7.71 ppb 10 ppb Within Limit
19 97625 Dairy 7.71 ppb 10 ppb Within Limit

Lowest Arsenic Levels in Oregon

ZIP Code City Level Detected
97625 Dairy 7.71 ppb
97603 Klamath Falls 7.71 ppb
97602 Klamath Falls 7.71 ppb
97601 Klamath Falls 7.71 ppb
97756 Redmond 230 ppb
97753 Powell Butte 230 ppb
97080 Gresham 310 ppb
97030 Gresham 310 ppb
97224 Portland 900 ppb
97078 First Consumers Nat Bank 900 ppb

Cities with Arsenic Data in Oregon

13 cities in Oregon have arsenic testing data available.

Oregon Water Quality Overview: See statewide water quality rankings on the Oregon water quality page.
Learn more about Arsenic: Read the full guide on Arsenic in drinking water.
Home → Contaminants → Arsenic → Oregon

How to cite this page

APA ZipCheckup. (2026). Arsenic in Oregon Drinking Water — 19 ZIPs Tested. https://zipcheckup.com/contaminants/arsenic/oregon/
BibTeX 
@misc{zipcheckup-contaminants-arsenic-oregon,
  author = {{ZipCheckup}},
  title  = {{Arsenic in Oregon Drinking Water — 19 ZIPs Tested}},
  year   = {2026},
  url    = {https://zipcheckup.com/contaminants/arsenic/oregon/}
}

Data as of July 2026.

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