Environmental Rules in Kendall County, IL (2026)
4 rules for unincorporated Kendall County, Illinois.
Verified from official government sources
Stormwater Management
Kendall County Code § 16-79 requires every new development in the unincorporated county to keep its site reasonably safe from flooding, barring projects that shift flood-protection costs onto neighbors or that raise flood elevations or cut flood-conveyance capacity off site. Stormwater facilities must be functional before building permits issue for subdivisions.
Kendall County Stormwater Development Standards
Some RestrictionsKendall County Code § 16-79
(a)Requirements applicable to all development. All development shall ensure the development site is reasonably safe from flooding. No development shall:(1)Result in any new or additional expense to any person other than the developer for flood protection; nor(2)Increase flood elevations or decrease flood conveyance capacity upstream or downstream of the area under the ownership or control of th...
Erosion Control
Kendall County Code § 16-106 requires every development site in the unincorporated county to plan erosion and sediment control from the start, favoring erosion prevention over sediment cleanup, retaining natural vegetation near watercourses, and installing sediment traps and filter barriers before or as clearing and grading begin. All sites must also meet NPDES construction requirements.
Kendall County Erosion & Sediment Control Rules
Some RestrictionsKendall County Code § 16-106
(a)Measures taken to control soil erosion and sediment runoff should be adequate to ensure that sediment is not transported from the site. The following principles shall apply to all development activities within the County:(1)Erosion and sediment control planning shall be part of the initial site planning process. In planning the erosion and sediment control strategy, preference shall be given...
Flood Zones
Unincorporated Kendall County bars any development inside a mapped floodplain until the Floodplain Administrator issues a stormwater permit under Sec. 16-138. Sec. 16-140 then forbids any floodplain project, on its own or combined with others, that raises flood stage or velocity off site or creates a damaging flood-height increase on site.
Kendall County Floodplain Development Permit
Some RestrictionsKendall County Code §§ 16-138(c), 16-140(a)(1)
(c)No person, firm, corporation, or governmental body, not exempted by law, shall commence any development in the floodplain without first obtaining a stormwater permit from the Floodplain Administrator. ... (1)No development except as allowed in Section 16-142 shall be allowed in the regulatory floodplain that singularly or cumulatively creates an increase in flood stage or velocity off site, ...
Flood Elevation Requirements
In unincorporated Kendall County, any new construction or substantial improvement in the regulatory floodplain must have its lowest floor raised to the flood protection elevation: the base flood elevation (BFE) plus two feet of freeboard. Attached garages need only reach a half foot above BFE. The Floodplain Administrator enforces the standard under County Code Chapter 16.
Kendall County Flood Elevation & Freeboard Rule
Some RestrictionsKendall County Code §§ 16-52, 16-140(c)
Flood protection elevation (FPE) means the elevation of the BFE, plus two (2) feet of freeboard for structures within the plan limits of the base flood elevation. ... The lowest floor, including basements, of all new construction and substantial improvements must have the lowest floor elevated to the FPE except nonresidential buildings may be dry-floodproofed up to the flood protection elevatio...
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