Tinley Park, IL Environmental Rules: Stormwater Management (2026)

05 sets the village's general performance criteria for storm water management, which apply at every site unless the village judges the site exempt or grants a waiver. Site designs must, to the maximum extent possible, establish practices controlling the peak flow rate of storm water associated with specified design storms and reducing runoff generation, using pervious areas for treatment and infiltrating runoff from driveways, sidewalks, rooftops, parking lots and landscaped areas wherever practical. Stream channels must be protected from degradation using the channel protection criterion in the Illinois Urban Manual, and peak-flow calculations required by the Metropolitan Water Reclamation District of Greater Chicago govern the sizing of storm water practices.

Industrial sites required to prepare a storm water pollution prevention plan must also file a notice of intent under the National Pollutant Discharge Elimination System general permit, a requirement that applies to both existing and new industrial sites. 06 adds specific design criteria: detention basins must capture runoff pollutants, with preference given to wet-bottom and wetland designs near existing wetlands, and dry basins with low-flow bypasses may be used where suitable, promoting retention and infiltration to cut runoff volume and pollutant load. 07 requires post-construction compliance with NPDES permit ILR10 and long-term operation and maintenance of best management practices. 08 only if the applicant shows one of five conditions, such as an approved alternative plan or an equally protective off-site facility.