News release: Well sampling planned in St. Louis County for Groundwater Atlas

August 24, 2023

The Minnesota Department of Natural Resources will collect water samples from about 180 wells in St. Louis County for use in the development of a Groundwater Atlas of St. Louis County.

Selected well owners will be contacted by mail or phone to request permission to sample their wells. The process involves collecting a water sample from an outside spigot or hydrant for laboratory analysis. Dozens of different water components are analyzed to determine the natural chemistry of aquifers. Participation is voluntary and owners will receive a report of the laboratory results. Sample well locations are shown on the maps produced for the atlas, but no contact or ownership information is included in the data. There is no cost to well owners.

Wells are selected based on geology, location, well depth and well construction. Participation will help hydrologists create county maps and descriptions of groundwater distribution, movement, conditions, and the pollution sensitivity of aquifers. The final atlas products will be available as printed maps, reports and geographic information system files available on the web.

The groundwater atlases are used to identify viable sources of drinking water, manage sustainability, guide decisions for well and septic system construction, inform well-head protection efforts for public water supply, understand regional recharge and groundwater movement, and assess pollution sensitivity and possible contaminant migration. Neither well sampling nor the atlases are used to regulate individual well owners.

The Groundwater Atlas of St. Louis County is expected to be completed in 2025. This groundwater portion is Part B of a two-part series. Part A, the geology of St. Louis County, was completed by the Minnesota Geological Survey in 2022.

The County Atlas Program is funded in part by the Minnesota Environment and Natural Resources Trust Fund as recommended by the Legislative-Citizen Commission on Minnesota Resources.

A full description of this Minnesota DNR program and completed atlas products are available on the Minnesota DNR website.

For more information, contact:

  • Emma Young, DNR hydrogeologist, 651-259-5680.
  • Paul Putzier, DNR County Groundwater Atlas Program supervisor, 651-259-5692.

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