Well Water & Nitrate Risk in Morrill County, NE

Most of Morrill County sits outside any documented water-quality problem area, but a 2-to-5-mile strip along the North Platte River carries a real, NRD-confirmed nitrate contamination pattern. Here's what the sub-area designation actually restricts, what testing shows, and how a buyer can check a specific parcel and offset treatment costs.

This page covers what's specific to Morrill County. For the general explanation, see the national guide.

What the Lisco-Oshkosh-Lewellen designation actually means on the ground

North Platte NRD, the single district governing groundwater across all of Morrill County, has designated a documented nitrate problem area it calls the Lisco-Oshkosh-Lewellen Groundwater Quality Sub-Management Area -- a strip of land 2 to 5 miles wide running along the north side of the North Platte River, spanning parts of both Morrill and neighboring Garden Counties. This isn't a precautionary buffer drawn on a map; it's a response to actual testing. The NRD's periodic well sampling in the sub-area finds roughly 40% of tested wells at or above the EPA's 10 parts-per-million drinking-water limit for nitrate, a pattern a 1990 University of Nebraska-Lincoln Conservation and Survey Division study traced to fertilizer leaching from corn fields sitting over a shallow aquifer in that stretch.

Because of that documented contamination, producers with irrigated ground inside the sub-area operate under Level 2 regulatory controls on fertilizer application, jointly approved by North Platte NRD and the state, aimed at reducing further nitrate loading to groundwater. For a land buyer, the sub-area designation carries two separate practical implications depending on what you plan to do with the parcel: if you intend to farm it, ask North Platte NRD directly what Level 2 controls require for nitrogen application timing and rate; if you intend to live on it and rely on a private well for drinking water, the contamination risk is the more urgent question, regardless of whether you ever apply fertilizer yourself.

Testing a well before you buy, and paying for treatment if it fails

Nebraska does not require private well water testing by state or federal law outside specific cases like licensed childcare or foster-care homes, so a well on land you're considering in Morrill County has not necessarily been tested recently, even inside the documented sub-area. The standard recommendation from University of Nebraska-Lincoln's water program is an annual test for nitrate and bacteria at minimum, with results at or above 10.1 mg/L nitrate considered unsafe for infants and a health concern for others. Before closing on any well-dependent parcel in or near the sub-area, request current nitrate test results from the seller, or have the well independently tested through a local health department or university-affiliated lab -- don't rely on the county-wide 40% figure to tell you about one specific well, since results vary well to well even within the same strip of land.

If a test does come back above the safe threshold, Nebraska has put real money behind fixing exactly this problem: a $1.2 million Reverse Osmosis Rebate Program offers eligible private well owners up to $4,000 toward a reverse-osmosis treatment system once nitrate tests above 10 ppm. A buyer who finds elevated nitrate in a Morrill County well shouldn't treat that result as a deal-breaker by default -- ask North Platte NRD (which can also advise on testing and treatment options for the county) or the relevant local health district whether the property and a planned treatment system would qualify for that rebate before assuming the full cost of remediation falls on you alone.

Well Water and Nitrate Contamination in Morrill County, Nebraska

What the Lisco-Oshkosh-Lewellen designation actually means on the ground

Testing a well before you buy, and paying for treatment if it fails

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