UT HB0489

Limits use of retention basins within the Great Salt Lake basin starting January 1, 2027, requiring permittees to prioritize alternative low impact development practices unless no feasible alternative exists

Requires detention basins used for post-construction retention in the Great Salt Lake basin to be designed to drain all water, provided the design does not interfere with flood control or drainage capacity

Defines the Great Salt Lake basin to include drainage areas of the Bear River, Weber River, Jordan River, Utah Lake, Bear Lake, Tooele Valley, and other tributaries to the Great Salt Lake

Amends Utah Code Section 19-5-108.5 governing storm water permits and adds new definitions for detention basins, retention basins, and Great Salt Lake basin

Takes effect May 6, 2026