2025 Session Last amended: 1989 session

§ 103I.661 — Mined Underground Space Development

Plain-Language Summary

When a mined underground space project involves pumping groundwater out of underground formations (dewatering), the Commissioners of Natural Resources and Health must jointly review the project plans to assess the effects on groundwater quality and quantity. No such project can begin until the DNR issues a water-use permit under chapter 103G.

Practical Notes
Underground space development projects — such as limestone mine caverns repurposed for storage — that require significant dewatering must clear a joint state review before work begins. This protects nearby groundwater users from losing access to their water supply. The DNR’s water-use permit requirement is a separate approval from any local land use permits.