Arsenic
What it is
A naturally occurring element found in some rock and soil, and in past use in pesticides and wood preservatives. It has no taste, color, or smell. Some Maryland aquifers contain natural arsenic.
Your body
Long-term exposure has been linked to skin changes, circulatory problems, and an increased risk of bladder, lung, and skin cancers (EPA, WHO). EPA’s health goal is zero.
Your home
Arsenic at levels found in drinking water does not usually harm plumbing or appliances.
Federal standard: MCL 10 ppb; health goal 0 (EPA)
Treatment options that can reduce it
Arsenic comes in two forms. Some wells need a pre-treatment step before reverse osmosis works well, which a water test will show.
Maryland water systems that reported arsenic
- City of CambridgeDorchester · 2025 data
- Town of OxfordTalbot · 2025 data
- Town of St. MichaelsTalbot · 2025 data
See common private-well contaminants →
The information on this site is for general education only and is not medical advice. Talk with a qualified health professional about health concerns. Water treatment equipment performance depends on the system, its certification, and proper maintenance.
Find out what's in your water. It's free.
Book a free in-home water test, or call and talk to a real person in Easton.