New Mexico Well Water
Last reviewed October 29, 2026
Overview
Private wells supply water to many New Mexico 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
New Mexico draws from alluvial basin and Rio Grande rift aquifers in an arid climate. The documented regional concerns below indicate what is worth testing for — not what any individual well contains.
Documented regional concerns
- Naturally occurring arsenic in parts of the state — odorless and tasteless, so only testing reveals it.
- Naturally occurring fluoride above recommended levels in some groundwater.
- Naturally occurring uranium in some aquifers.
- High total dissolved solids/salinity in some aquifers.
- Nitrate from agricultural and septic influence, especially in farmed areas.
These are documented possibilities, not a reading of your well
Frequently asked questions
What should well owners in New Mexico test for?
A practical panel for New Mexico private wells includes Total coliform bacteria, Nitrate (as N), pH, Arsenic, Fluoride, Uranium, Total dissolved solids. Test bacteria and nitrate at least annually and use a state-certified laboratory; confirm local recommendations with your state health department and New Mexico State University Cooperative Extension.
Are private wells regulated in New Mexico?
Private wells are generally not covered by the federal Safe Drinking Water Act, though New Mexico 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.