Stormwater Management

The City of Norwalk considers successful storm water management a critical element in keeping the community clean, beautiful and safe. Norwalk storm water management works to improve the quality of storm water being discharged into the local waterways. The information shown below provides details on Norwalk’s Municipal Separate Storm Sewer System (MS4) Permit as required by the Iowa Department of Natural Resources (IDNR).

What is STORMWATER?
Iowa Department of Natural Resources (IDNR) defines stormwater as: “The rainfall or snowmelt that runs off permeable surfaces or impervious surfaces like roads, buildings, sidewalks or compacted ground surfaces. Stormwater can flow directly to streams and lakes or it may be transported by municipal storm drain systems. Unlike sanitary sewers, storm sewers do not lead to treatment plants, but drain directly into our streams and lakes.”

“As communities grow, they often experience more stormwater runoff problems due to their increasing impervious surface areas. Rainfall and snowmelt that would normally infiltrate into the soil becomes runoff. This increases both the volume and rate of runoff, which leads to flooding, streambank erosion, and potential damages to public and private property and water quality.”

Stormwater Advisory Committee
The City of Norwalk maintains a Public Utility Advisory Committee which acts as the Stormwater Advisory Committee composed of local residents with varying professions and backgrounds. The Committee is intended to provide a community perspective on public utility and stormwater issues and meet monthly to attempt to accomplish goals the group sets forth.

Erosion control on construction sites is a key component to a successful stormwater management program. Construction sites can often be areas where sediment discharge and stormwater pollution take place. Proper site stabilization and stormwater management practices are critical to eliminate the discharge of sediment and pollutants from these sites.

The Iowa Department of Natural Resources (IDNR) NPDES Permit and the City of Norwalk’s Municipal Separate Storm Sewer System (MS4) permit both require that all construction activity over one acre create and maintain a Stormwater Pollution Prevention Plan. The City of Norwalk is mandated by the MS4 to inspect Norwalk construction sites and ensure that they comply with the required state and local requirements.

Norwalk SWPPP Inspection Checklist

Available Brochures

Urban Storm Water Retrofit BMP's
Common Sense Conservation
Concrete Washout
Household Hazardous Waste
Protecting Iowa's Water Quality
A Common Storm Water Management Misconception
The Art to "SMART" Development
A New Storm Water Paradigm
Watersheds 101
NPDES Permit General Permit
Illicit Discharge Ordinance

Construction Site & Erosion Control Resources

Statewide Urban Design Standards and Specifications (SUDAS)

IDNR Stormwater Website

Questions regarding the NPDES permit should be directed to IDNR Stormwater Coordinator at 515-281-7017

IDNR District 5 Field Office (Des Moines): 515-725-0268

Construction Site and Erosion Control Training Events
The Urban Connection
Iowa Association of Municipal Utilities

Contact Us

Stormwater Hotline: 515.981.9530

Education

As the City of Norwalk continues to grow and develop, so do the amount of impervious surfaces ie. Streets, parking lots, sidewalks, and buildings. During rain and thaw events, deposits of pollutants, soils, chemicals, etc. end up in to the storm sewer system and local waterways. It is of the utmost importance to the City of Norwalk to eliminate as much of these discharges as possible to ensure a clean environment.

Homeowner Tips & Guidelines

Litter and Pet Waste: Keep litter, pet waste, leaves, and debris out of street gutters and storm drains--these outlets drain directly to lakes, streams, rivers, and wetlands.

Oil and other Household Chemicals: Dispose of used oil, antifreeze, paint, and other household chemicals properly, not in storm sewers or drains. Clean up spilled brake fluid, oil, grease, and antifreeze. Do not hose them into the street where they can eventually reach local streams and lakes. Household hazardous wastes can be taken to the Regional Collection Center for Household Hazardous Waste in Bondurant (515-967-5512). Take Marshalltown exit north off of I-80 just east of Des Moines, go 1 mile north on Hwy 65, it is the building on the left side of the road with the green roof.

Soil: Control soil erosion on your property by planting ground cover and stabilizing erosion-prone areas.

Septic Systems: Have your septic system inspected and pumped, at a minimum, every three to five years so that it operates properly.

Resources

US EPA - "Do's and Don'ts Around Home"
Educational Brochures
Best Management Practices

Links

Iowa Department of Natural Resources Stormwater Website
EPA Stormwater Program
IOWATER
Iowa Stormwater Partnership

Contact Us
Development Services Staff
Stormwater Hotline: 515.981.9530

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