Nahn and Associates was formed in 2004 to provide services to developers, municipalities, industries and non-profit groups including:

Storm Water/Erosion Control Ordinance,
Storm Water Master Plans,
Storm Water Permitting (Municipal/Construction/Industrial),
Hydraulics and Hydrology,
Erosion Control Planning,
Site Development,
Floodplain Delineation and Mapping, (LOMA, LOMR-F, LOMR)
Flood Control Improvements,
Storm Water Detention Basins,
Storm Water Quality Modeling,
Infiltration Basin,
Environmental Permitting, (WDNR Chapter 30, NR 216 and USACE 404)
Lake Planning Studies,
Grant Writing, (Urban NPS, TRM, Lake Planning, FEMA Flood Control, Recreation Boating Facility)
Lake and Channel Sediment Removal,
Streambank Stabilization,
All Hazard Mitigation Planning,
Porous Asphalt Pavement,
Multiple-Use Recreational Trails.

The company is based in Middleton, Wisconsin providing water resource and municipal engineering services to clients throughout Wisconsin.