Arsenic in Maryland Drinking Water — 29 ZIPs Tested
EPA data analysis for arsenic in Maryland drinking water systems
Arsenic Contamination in Maryland
ZipCheckup analyzed drinking water data across 615 ZIP codes in Maryland for arsenic contamination. 29 ZIP codes have reported arsenic detections, and 0 have EPA violations on record.
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 Maryland
These ZIP codes reported the highest arsenic levels in Maryland based on CCR reports and EPA data:
Lowest Arsenic Levels in Maryland
These ZIP codes had the lowest reported arsenic detections in Maryland:
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 Maryland.
Worst ZIP Codes for Arsenic in Maryland
Ranked by highest arsenic detection level.
| Rank | ZIP Code | City | Level Detected | EPA Limit | Status |
|---|---|---|---|---|---|
| 1 | 20610 | Barstow | 10 ppb | 10 ppb | Within Limit |
| 2 | 20612 | Benedict | 10 ppb | 10 ppb | Within Limit |
| 3 | 20639 | Huntingtown | 10 ppb | 10 ppb | Within Limit |
| 4 | 20678 | Prince Frederick | 10 ppb | 10 ppb | Within Limit |
| 5 | 20657 | Lusby | 9 ppb | 10 ppb | Within Limit |
| 6 | 21634 | Fishing Creek | 9 ppb | 10 ppb | Within Limit |
| 7 | 21664 | Secretary | 9 ppb | 10 ppb | Within Limit |
| 8 | 21669 | Taylors Island | 9 ppb | 10 ppb | Within Limit |
| 9 | 20606 | Abell | 8 ppb | 10 ppb | Within Limit |
| 10 | 20609 | Avenue | 8 ppb | 10 ppb | Within Limit |
| 11 | 20619 | California | 8 ppb | 10 ppb | Within Limit |
| 12 | 20624 | Clements | 8 ppb | 10 ppb | Within Limit |
| 13 | 20626 | Coltons Point | 8 ppb | 10 ppb | Within Limit |
| 14 | 20627 | Compton | 8 ppb | 10 ppb | Within Limit |
| 15 | 20635 | Helen | 8 ppb | 10 ppb | Within Limit |
| 16 | 20636 | Hollywood | 8 ppb | 10 ppb | Within Limit |
| 17 | 20650 | Leonardtown | 8 ppb | 10 ppb | Within Limit |
| 18 | 20656 | Loveville | 8 ppb | 10 ppb | Within Limit |
| 19 | 20667 | Park Hall | 8 ppb | 10 ppb | Within Limit |
| 20 | 20676 | Port Republic | 7 ppb | 10 ppb | Within Limit |
Lowest Arsenic Levels in Maryland
Cities with Arsenic Data in Maryland
8 cities in Maryland have arsenic testing data available.