Well Water and Oilfield Brine Spill Risk in Williams County, North Dakota

Brine spills are a real, recurring, current event in Williams County -- not a hypothetical

Oilfield brine, also called produced water, is a byproduct of oil and gas production that comes up alongside oil from Bakken wells; it carries very high salt concentrations along with contaminants including ammonium, selenium, and lead. Statewide, more than 3,900 brine spills have been documented, most from pipeline or infrastructure failures moving flowback and produced water, and Williams County -- as one of the most heavily drilled counties in the state -- sees its share of them. In May 2025, a pipeline failure roughly 16 miles northeast of Williston released an estimated 73,000 barrels (nearly 3.1 million gallons) of brine, contaminating grassland and an unnamed tributary that flows into Stony Creek; in a separate incident reported in May 2026, about 400 barrels of produced water were released roughly 15 miles west of Williston. Regulators in both cases stated there was no immediate known risk to drinking water while groundwater impacts were investigated -- but 'no known risk at the time of the report' is not the same as a confirmed all-clear for a specific well down-gradient of a spill site.

None of this means every well in Williams County is at risk, or that oilfield activity makes a well unusable -- the great majority of the county's land and wells are unaffected by any specific spill. It does mean that a generic 'test your well before you buy' recommendation is worth sharpening here into a specific step: check whether any reported spill sits near or up-gradient of the parcel you're evaluating, not just whether wells are generally safe in North Dakota.

How to actually check a specific parcel

Since January 1, 2021, environmental incidents including oilfield spills in North Dakota have been logged in the state's Unified Spill Reporting System, which includes a public access tool for looking up reported incidents. Before closing on a Williams County parcel that will rely on a private well, search that system (and the Department of Mineral Resources' own spill-notice postings) for reported incidents near the property, and ask directly whether any pipeline, wellsite, or saltwater disposal facility sits nearby or upstream in the local drainage. Beyond the spill-history check, get a full water test for total dissolved solids, chloride, and the specific constituents associated with brine contamination (not just a standard bacterial safety test) on any well in a heavily drilled area, and ask a well driller or the county health office whether the specific aquifer serving that parcel has any known contamination history.