Environmental Rules in Rockford, IL (2026)
4 verified environmental rules for Rockford, Illinois, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Rockford requires a stormwater management permit and onsite detention for most new development of a half acre or more, capping post-development runoff release.
Rockford Stormwater Detention Permit Rules
Some RestrictionsRockford City Code § 109-23(b)
Absent any applicable watershed plan or interim watershed plan, sufficient storage shall be provided such that the probability of the post-development release rate exceeding 0.2 cfs/acre of development shall be less than one percent per year.
Erosion Control
Rockford requires a stormwater management permit before disturbing more than 1,000 square feet of ground or 250 cubic yards of soil, or building in the regulatory floodplain.
Rockford Stormwater Management Permit
Some RestrictionsRockford, IL Code of Ordinances § 109-70(a)
A stormwater management permit is required if: ...(4) The development disturbs more than 1,000 square feet of ground (including the removal or placement of impervious surface material) or 250 cubic yards of soil, unless the development consists solely of: a. The installation, renovation or replacement of a septic system, potable water service line or other utility... b. The maintenance, repair ...
Flood Zones
Rockford requires a floodplain encroachment permit for any development in the regulatory floodplain, and bars projects that would raise flood stage, velocity, or flood heights off-site or on-site.
Rockford Floodplain Development Permit Rules
Significant RestrictionsRockford, IL Code of Ordinances §§ 109-43, 109-45(a)
All development shall meet the requirements set forth in table 4-03 and shall require a floodplain encroachment permit issued by the administrator. ... No development shall be allowed in the regulatory floodplain that singularly or cumulatively creates any increase in flood stage or velocity offsite, or a damaging or potentially damaging increase in flood heights or velocity onsite or a threat ...
Flood Elevation Requirements
Rockford requires new and substantially improved buildings in the floodplain to sit at least two feet above the base flood elevation.
Rockford Flood Elevation Rules
Some RestrictionsRockford, IL Code of Ordinances, Ch. 109, §§ 109-5(51), 109-47(a)-(b)
FPE or flood protection elevation means the BFE plus two feet of freeboard for structures at any given location in the floodplain. ... all buildings located in the floodplain shall be protected from flood damage below the flood protection elevation. ... The lowest floor (including basement) shall be at or above the flood protection elevation.
Looking for Winnebago County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Rockford city rules.
Environmental Rules in Winnebago County →