Dakota County, Nebraska: drinking water report. Dakota County in northeast Nebraska has a population of about 20,000, with South Sioux City as the county…
Dakota County in northeast Nebraska has a population of about 20,000, with South Sioux City as the county seat. The Missouri River and groundwater from alluvial deposits supply the community's water. The county's economy revolves around meatpacking – Tyson Foods operates one of the largest beef processing plants in the country in Dakota City. That industrial concentration, combined with feedlot operations in the surrounding agricultural land, shapes the local water quality picture.
Meatpacking operations produce large volumes of wastewater containing nitrogen, phosphorus, organic matter, and – increasingly documented – PFAS from food-grade packaging and processing chemicals. According to the Nebraska DEQ's 2024 discharge monitoring data, the Tyson facility's wastewater permit allows discharge into the Missouri River, and downstream monitoring has detected elevated nutrient levels.
Nitrate from feedlots and agricultural fertilizers is a concern for private well owners in the county. A 2023 University of Nebraska–Lincoln assessment of eastern Nebraska groundwater found that 18% of sampled wells in the Missouri River alluvial corridor exceeded the EPA's nitrate MCL of 10 mg/L. The EPA's UCMR5 data shows trace PFAS in the South Sioux City system.
If you are on a private well near feedlot operations or agricultural fields in Dakota County, annual nitrate testing is a worthwhile investment. The alluvial aquifer is shallow and responsive to surface activity, meaning contamination can reach your well within months of a surface event.
Check your water for data on your area. For nitrate, reverse osmosis is the most effective household treatment. Our water filter guide covers options for agricultural and industrial contamination. Pull your detailed report for any available trend data, and visit our Nebraska page for statewide context.