Environmental Rules in Linn County, IA (2026)

Linn County Code § 107-95(b)

Stormwater. To limit the impact of stormwater runoff, and accompanying sediment, heat, pollutants, and energy, certain development or clearing activities will be required to complete and implement a stormwater pollution prevention plan (SWPPP). Activities requiring a SWPPP. All applicants for major subdivisions, and applicants for all other the county permits or approvals that will result in la...

Linn County Code § 107-95(b)(1)-(2)

To limit the impact of stormwater runoff, and accompanying sediment, heat, pollutants, and energy, certain development or clearing activities will be required to complete and implement a stormwater pollution prevention plan (SWPPP). (1)Activities requiring a SWPPP. All applicants for major subdivisions, and applicants for all other the county permits or approvals that will result in land distu...

Linn County Code § 107-144(e)(2)

(2)Floodplain development permit required. A floodplain development permit issued by the zoning administrator shall be secured prior to initiation of any floodplain development (any manmade change to improved or unimproved real estate, including, but not limited to, buildings or other structures, mining, filling, grading, paving, excavation or drilling operations) including the placement of fac...

Linn County Code § 107-144(g)(5)b

All new or substantially improved residential structures shall have the lowest floor, including basements, utility systems, such as heating and cooling equipment, water heaters and similar devices, elevated a minimum of two feet above the base flood elevation. 2.Construction shall be upon compacted fill which shall, at all points, be no lower than two feet above the base flood elevation and ex...