Environmental Rules in Joliet, IL (2026)
4 verified environmental rules for Joliet, Illinois, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Joliet requires a detention facility with controlled release for new nonresidential construction over 5 acres, new residential development over 10 acres, and any site reaching 60 percent impervious cover. City Code Section 31-204 sizes these facilities to the 100-year storm using the rational method and caps outflow near natural, undeveloped runoff rates, with the Director of Public Works reviewing every design.
Joliet Stormwater Detention Requirements
Some RestrictionsJoliet City Code § 31-204
The stormwater detention regulations set forth in this section shall apply to all developments for which a preliminary plat has been applied for prior to December 1, 1993, or for which a preliminary plat has been approved prior to December 1, 1993, and remains valid. (a)A detention facility and controlled release of storm water runoff shall be required for the following:(1)All new construction ...
Erosion Control
Grading, filling, or excavation inside a mapped floodway in Joliet must follow the soil erosion and sedimentation control criteria in City Code Section 8-507(5)k. Natural vegetation can't be cleared more than 15 days before work starts, exposed soil needs stabilization within 15 days of reaching final grade, and sediment-control devices like filter fences and check dams must go in before major grading begins.
Joliet Floodway Erosion & Sediment Control
Some RestrictionsJoliet City Code § 8-507(5)k
Soil erosion and sedimentation measures. For all activities in the floodway, including grading, filling and excavation, in which there is potential for erosion of exposed soil, soil erosion and sedimentation control measures shall be employed consistent with the following criteria:1.The construction area shall be minimized to preserve the maximum vegetation possible. Construction shall be sched...
Flood Zones
Anyone developing land in Joliet's special flood hazard area, in either the Will County or Kendall County portion of the city, must get a development permit from the city manager before starting work, under the Joliet Special Flood Hazard Areas Development Ordinance.
Joliet Floodplain Development Permit Rules
Significant RestrictionsJoliet City Code §§ 8-505, 8-506
Development permit. No person, firm, corporation, or governmental body not exempted under Illinois law shall commence any development in the SFHA without first obtaining a development permit from the city manager. ... The base flood or one hundred (100) year frequency flood elevation for the SFHAs of all rivers and creeks shall be as delineated on the one hundred (100) year flood profiles in th...
Flood Elevation Requirements
Joliet adds one foot of freeboard on top of the base flood elevation to set the flood protection elevation, and the lowest floor, including the basement, of any new or substantially improved building in the flood plain must sit at or above that line.
Joliet Freeboard & Flood Protection Elevation
Significant RestrictionsJoliet City Code §§ 8-502, 8-509
Flood protection elevation (FPE) shall mean the elevation of the base flood one hundred (100) year frequency flood plus one (1) foot of freeboard at any given location in the SFHA. ... A residential or non-residential building, when allowed, may be constructed on permanent land fill in accordance with the following: a. The lowest floor, (including basement) shall be at or above the flood protec...
Looking for Will County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Joliet city rules.
Environmental Rules in Will County →