Well Water in Decatur County, Kansas

A specific spacing rule, not just a closed designation

Decatur County sits within GMD4, the Northwest Kansas Groundwater Management District, where the Ogallala aquifer is closed to new water-right appropriations districtwide. What that closure means in concrete regulatory terms is spelled out in K.A.R. 5-21-3: any well location proposed for a permit to appropriate water for a non-domestic beneficial use, drawing from the Ogallala aquifer, must be spaced at least 2,640 feet -- exactly half a mile -- from every other non-domestic well already constructed into the Ogallala. That's a specific, measurable distance a driller or buyer can check against a proposed well site, not just an abstract statement that the aquifer is "closed."

Because the aquifer is closed to new appropriations districtwide, in practice this spacing rule matters most for water-right transfers, replacement wells, and any other permitted well activity still possible within a closed area -- a genuinely new, unrestricted irrigation well is not generally an option here regardless of spacing, since new appropriations aren't being granted at all. Understanding the spacing rule is still useful for evaluating whether an existing water right's well could ever be relocated on the same parcel, and for understanding why a neighboring well's exact location can matter to your own property's water-right options.

Replacing an existing well carries its own restrictions

GMD4's own guidance flags that replacement wells -- drilling a new well to replace an existing, aging, or failed one tied to an existing water right -- are subject to their own siting controls, separate from the new-well spacing rule above. The district's stated recommendation is direct: contact GMD4's office before re-drilling an existing well, both for guidance on where a replacement can be sited and for help with the required paperwork. This is a real, practical step that matters specifically because a parcel bought with an existing water right doesn't automatically come with unlimited flexibility on where its well can be relocated if it ever needs replacing.

For a buyer evaluating land marketed with an existing irrigation water right and well, this means two separate questions are worth asking before closing: what happens if that well eventually needs to be replaced, and would a replacement be sited under different rules than the original well's placement. GMD4 is the direct source for both answers, and getting them before finalizing a purchase avoids discovering the constraint only after an existing well fails.

What to check before buying or drilling

1. Contact GMD4 directly to confirm the exact current spacing requirement and how it would apply to any specific proposed well location on a parcel you're considering.
2. If a parcel is marketed with an existing water right and well, ask GMD4 what siting rules would apply if that well ever needed to be replaced, before assuming replacement would be straightforward.
3. Confirm with GMD4 and the Kansas Division of Water Resources whether any domestic or stock-water well exemption applies to your intended use, since the 2,640-foot rule as documented applies specifically to non-domestic appropriative wells.
4. Don't rely on a listing's description of an "included water right" as a guarantee of unlimited future flexibility -- verify the right's priority date, authorized quantity, and any siting constraints directly with GMD4 before closing.