Waterloo, IA Environmental Rules: Erosion Control (2026)

Under City Code section 8-4B-1, a state NPDES general permit and stormwater pollution prevention plan (SWPPP) are required for construction disturbing one acre or more; sites under one acre that are not part of a larger common plan of development are exempt from the state permit, but Waterloo still requires a local CSR permit for stormwater discharges from all construction sites, closing that gap in state coverage. Section 8-4B-7 requires applicants to submit a CSR permit application and a site plan showing best management practices (BMPs), building and driveway footprints, and runoff flow direction.

Sites not covered by a state permit must implement BMPs sufficient to prevent pollutant discharge, arrange a preconstruction inspection with the City Engineer before disturbing land, and notify the City Engineer within 72 hours of any change in contractors or a substantial change in site conditions. Before closeout, the applicant must contact the City Engineer for a postconstruction inspection once the site reaches 70 percent uniform coverage with perennial vegetation or equivalent stabilization and all temporary erosion control measures have been removed. CSR permits tied to a state permit remain valid until the state permit expires or is discontinued; permits for sites without a state permit expire one year after issuance and must be renewed if construction is unfinished, with failure to renew treated as a violation.

The city may charge permit fees set by council resolution to fund its inspection and enforcement work, since no state or federal funds support the program.