Where naturally occurring arsenic and uranium in drinking water come from, and what long-term exposure above the legal limit is linked to.
Data current as of July 2026
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Unlike lead and copper, arsenic and uranium usually occur naturally in groundwater rather than coming from plumbing — but both carry real health considerations at elevated, sustained exposure.
Arsenic
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Uranium (Combined Uranium)
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Filtration
Both fall in the Metals category — reverse osmosis is generally the most broadly effective single technology against them, though not every RO system is certified for every substance. Check for NSF/ANSI 53 or 58 certification for the specific one you care about.
Live in this area? Simple Water Heater & Filtration can size a filtration system to whatever's actually on file for your utility.