Des Moines Chapter 42, Article XI requires grading permits for land-disturbing activities meeting specific size thresholds, especially near floodplains and waterways. Projects disturbing one acre or more must also obtain an Iowa DNR stormwater construction permit.
Chapter 42, Article XI (Stormwater, Grading, and Permit Plans) regulates grading and drainage in Des Moines. A grading permit is required when: (1) disturbance of 500+ sq ft occurs within a floodplain or within 100 feet of a drainageway; (2) 2,500+ cumulative sq ft of fill is placed; or (3) granular material stockpiles exceed 5,000 cubic yards. Residential permit fee is typically $130. Projects disturbing one acre or more require Iowa DNR General Permit No. 2 (NPDES Construction Stormwater), mandating a Stormwater Pollution Prevention Plan. Regulations aim to prevent soil loss into drainage systems and protect adjacent property drainage. Applications are submitted to the Des Moines Permit and Development Center.
Grading without a permit is a municipal infraction subject to stop-work orders and fines. Violations may also be referred to the Iowa DNR for unpermitted stormwater discharges, with state penalties up to $5,000 per day.
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