Wyoming Well Water
Last reviewed October 29, 2026
Overview
Private wells supply water to many Wyoming households. Because they are generally not regulated like public systems under the federal Safe Drinking Water Act, testing and wellhead protection are the owner’s responsibility.
Hydrogeology & what it means
Wyoming draws from bedrock and alluvial aquifers. The documented regional concerns below indicate what is worth testing for — not what any individual well contains.
Documented regional concerns
- Naturally occurring uranium in some aquifers.
- Naturally occurring radium/radionuclides in some deep aquifers.
- Elevated sulfate giving a bitter taste and potential laxative effect.
- High total dissolved solids/salinity in some aquifers.
- Iron and manganese causing staining and metallic taste (aesthetic).
These are documented possibilities, not a reading of your well
Frequently asked questions
What should well owners in Wyoming test for?
A practical panel for Wyoming private wells includes Total coliform bacteria, Nitrate (as N), pH, Uranium, Radium / gross alpha, Sulfate, Total dissolved solids, Iron, Manganese. Test bacteria and nitrate at least annually and use a state-certified laboratory; confirm local recommendations with your state health department and University of Wyoming Cooperative Extension.
Are private wells regulated in Wyoming?
Private wells are generally not covered by the federal Safe Drinking Water Act, though Wyoming or local rules may apply to construction, permitting, or testing. Public-system limits such as EPA MCLs are useful reference points, not automatic legal limits for your well.