North Dakota Well Water
Last reviewed October 29, 2026
Overview
Private wells supply water to many North Dakota 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
North Dakota draws from glacial-drift and bedrock aquifers. The documented regional concerns below indicate what is worth testing for — not what any individual well contains.
Documented regional concerns
- High total dissolved solids/salinity in some aquifers.
- Elevated sulfate giving a bitter taste and potential laxative effect.
- Naturally occurring arsenic in parts of the state — odorless and tasteless, so only testing reveals it.
- Naturally occurring selenium in some western aquifers.
- Hard water from carbonate (limestone/dolomite) aquifers.
These are documented possibilities, not a reading of your well
Frequently asked questions
What should well owners in North Dakota test for?
A practical panel for North Dakota private wells includes Total coliform bacteria, Nitrate (as N), pH, Total dissolved solids, Sulfate, Arsenic, Selenium, Total hardness. Test bacteria and nitrate at least annually and use a state-certified laboratory; confirm local recommendations with your state health department and North Dakota State University Cooperative Extension.
Are private wells regulated in North Dakota?
Private wells are generally not covered by the federal Safe Drinking Water Act, though North Dakota 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.