Free North Dakota water report: PFAS & lead levels for every water system, worst-affected cities, and EPA violations. Check your ZIP.
North Dakota's approximately 780,000 residents are spread across a vast, sparsely populated state where water infrastructure serves small communities separated by long distances. The major population centers – Fargo, Bismarck, Grand Forks, and Minot – operate municipal water systems drawing from rivers (the Red River, Missouri River, and Souris River) and treated lake water. Rural communities rely on regional water systems, small-town utilities, and private wells. The North Dakota Department of Environmental Quality (NDDEQ) oversees drinking water compliance in a state where the primary water quality concerns have historically been natural – high mineral content, hardness, and sulfate levels – rather than industrial contamination. PFAS has added a newer dimension to this picture.
The primary PFAS contamination source in North Dakota is Minot Air Force Base, home to the 5th Bomb Wing and located adjacent to the city of Minot. AFFF use at the base over decades has left PFAS in groundwater that has been detected in monitoring wells on and near the installation. The Department of Defense has conducted site investigations and sampling, and some off-base impacts have been identified.
Minot itself has approximately 49,000 residents, and the city's water system draws from the Souris River and supplemental wells. The proximity of the base to the city's water infrastructure makes the contamination pathway a concern even if current tap water testing shows compliance with federal MCLs.
Beyond military PFAS, North Dakota faces water quality challenges tied to its oil production industry. The Bakken shale formation in western North Dakota has driven a significant oil boom, and produced water – the brine that comes up alongside oil – is a major waste stream. Produced water contains naturally occurring radioactive materials, heavy metals, and various organic compounds. Spills and improper disposal have contaminated surface water and groundwater in oil-producing counties. While produced water is a separate issue from PFAS, it compounds the overall water quality burden in western North Dakota.
The EPA's UCMR5 testing has covered North Dakota's larger public water systems, and results are incorporated into our data alongside state monitoring and military site investigations.
North Dakota's PFAS footprint is small compared to industrial states. It has one primary military contamination source and no major industrial PFAS manufacturers. The state's low population density means fewer people are exposed, and the contamination is relatively concentrated geographically.
Compared to neighboring states, North Dakota's situation is less severe than Minnesota's (which has the 3M contamination legacy in the Twin Cities) or Montana's (which has multiple military PFAS sites). However, North Dakota's rural water infrastructure is less equipped to handle treatment upgrades than larger states with bigger utility budgets.
The oil production water quality issues in western North Dakota are more unique to the state and represent a contamination challenge that most eastern states do not face. The intersection of energy production and water quality is the defining environmental tension in the western part of the state.
Water quality in North Dakota depends on whether you are on a municipal system in one of the larger cities, a regional rural water system, or a private well.
1. Check your water quality using our free lookup tool. We map UCMR5 data, state monitoring, and military testing results to your ZIP code. 2. If PFAS or other contaminants are present, a reverse osmosis system provides effective removal – over 90% for most PFAS compounds and reduction of many minerals and other contaminants common in North Dakota groundwater. Our water filter guide compares systems by independent lab data. 3. Private well owners near Minot AFB or in oil-producing regions should test their water regularly. Request a detailed water report for your address.
For more on PFAS science, see our PFAS guide.
North Dakota's water history is shaped by the Missouri River system and by the massive federal water projects that transformed the state in the mid-20th century. The Garrison Dam, completed in 1953, created Lake Sakakawea – one of the largest man-made reservoirs in the United States – and altered the hydrology of the entire upper Missouri basin. The reservoir provides water supply, flood control, and irrigation, and the Southwest Pipeline Project delivers treated Missouri River water to communities across southwestern North Dakota that previously relied on marginal-quality local groundwater.
Minot experienced a catastrophic flood in 2011 when the Souris River reached record levels, inundating much of the city including areas near the air force base. The flood raised concerns about contaminant mobilization from the base and other sources, though systematic PFAS testing did not begin until several years later.
The Bakken oil boom, which accelerated after 2008, brought rapid population growth and industrial activity to western North Dakota. With the boom came increased water demand and increased contamination risk from produced water, drilling fluids, and pipeline spills. Multiple incidents of produced water reaching surface waterways have been documented, including a 2014 spill near Mandaree on the Fort Berthold Reservation that released over a million gallons of brine into a tributary of Lake Sakakawea.
North Dakota's water challenges are evolving from historical concerns about natural water quality to newer threats from military contamination and energy production. Check your specific address to see what monitoring data is available for your location.