Modifies provisions governing county sales taxes for park purposes to allow tax revenues to be used for storm water management projects in parks

HB 1271 modifies how county sales tax revenues for parks are allocated, allowing counties to use 50% of collected taxes for park-related storm water management projects that use natural infrastructure (like rain gardens or bioswales) without harming park benefits. This directly affects counties within the metropolitan park district, municipalities receiving grant funds, and park districts managing recreational facilities. The bill requires counties to reserve 40% of this 50% allocation for municipal grants to fund park projects, with specific rules for large counties (over 900,000 residents) to distribute funds via a municipal grant commission. It maintains existing funding for park operations and the Gateway Arch grounds but expands eligible uses for county-level park funds.