Environmental Rules in Evanston, IL (2026)
5 verified environmental rules for Evanston, Illinois, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Evanston requires on-site storm water detention and release-rate control for all new developments, mandatory once a project's footprint tops 5,000 square feet and construction costs exceed the parcel's full assessed value.
Evanston Storm Water Control Requirements
Some RestrictionsEvanston City Code § 4-20-4-1
All new developments shall provide storm water control for the entire property. Additionally, any development: a) where the final building footprint is greater than five thousand (5,000) square feet, and b) having construction costs greater than one hundred percent (100%) of the latest property value as published by the Cook County assessor's office for the existing tax parcel(s) affected by th...
Erosion Control
Evanston requires an approved erosion and sediment control plan before it issues a building permit for any site that disturbs more than 5,000 square feet, under City Code § 4-23-5. The plan must follow Illinois Urban Manual best management practices, route runoff through sediment controls at every construction phase, and get permanent stabilization measures started within seven days after grading work ends.
Evanston Construction Site Erosion Control Plan
Some RestrictionsEvanston City Code § 4-23-5
4-23-5. - DESIGN STANDARDS AND FEATURES. An erosion and sediment control plan for developments with site disturbance over five thousand (5,000) square feet must be submitted and approved prior to the issuance of the building permit. The plan must include the following features: (A)Standards and specifications for erosion and sediment control measures, which shall be in accordance with the Illin...
Flood Zones
Any new construction, substantial improvement, or watercourse alteration in Evanston's floodplain requires a floodplain development permit from the Floodplain Administrator before any work begins.
Evanston Floodplain Development Permit
Some RestrictionsEvanston City Code § 4-13-3-1
No person, firm, corporation, or governmental body shall commence any development activities, including new construction, substantial improvements, and alterations of a watercourse wholly within, partially within or in contact with the floodplains until a floodplain development permit is obtained from the Floodplain Administrator. No permit shall be issued by the Floodplain Administrator until ...
Vehicle Idling Restrictions
In Evanston, a standing or parked motor vehicle weighing 8,000 pounds or more must not idle for more than five minutes in any 60-minute period on any public street, public place, or private property. City Code Section 10-4-18-1 lists eleven exceptions, from traffic congestion to bus passenger comfort, and violators face a $150 fine under Section 10-4-18-2.
Evanston Heavy Vehicle Idling Time Limit
Some RestrictionsEvanston City Code § 10-4-18-1, § 10-4-18-2
No standing or parked motor vehicle with a gross vehicle weight rating of eight thousand (8,000) pounds or greater shall be allowed to idle on any public street, public place, or private property for more than a total of five (5) minutes within a sixty-minute period except under the following circumstances: ... (G)A bus idles a maximum of fifteen (15) minutes in any sixty-minute period to maint...
Flood Elevation Requirements
New and substantially improved residential buildings in Evanston's mapped floodplain must have their lowest floor, including any basement, elevated to the Flood Protection Elevation, defined as the base flood elevation plus one foot of freeboard, under City Code § 4-13-8(C)(2). The base flood elevation itself is set from FEMA's Cook County Flood Insurance Study dated September 10, 2021, under § 4-13-4(A).
Evanston Floodplain Freeboard Elevation Rule
Some RestrictionsEvanston City Code § 4-13-8(C)(2)
2.Residential Buildings. In zones A, AO, AH, and AE, the lowest floor, including basement, of new construction of residential buildings, and substantially improved residential buildings, must be elevated to the FPE, and are subject to the more specific additional requirements below.a.If fill, including grading to redistribute onsite material to alter existing topography, is used as a means of e...
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County ordinances apply to unincorporated areas and may supplement Evanston city rules.
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