Friday, December 15, 2017
City Of Marshalltown
Storm Water Management

Managing Storm Water In Our Community

Storm water can pose a risk to our water resources. Pollutants in storm water can affect lakes, streams, and rivers. New Programs to control storm water pollution are being adopted by our community.

**NEW** Storm Water Rate Study

The following presentation was prepared by Stanley Consultants and presented to the City Council on March 4, 2013.

Storm Water Rate Study Presentation

Download Ordinance & Permit application

Storm Water Ordinance
Storm Water Permit Application

What Is Storm Water Runoff?

Storm water runoff is rainfall or snowmelt that runs off impervious surfaces like roads, buildings, and compacted soils. Storm water runoff is collected and conveyed through storm intakes and storm sewers directly into streams, rivers, and lakes without being treated.

The Problem

Pollutants accumulate on impervious surfaces between rainfall events. Frequent, small rains wash pollutants into streams, rivers, and lakes. These pollutants negatively affect water quality.

As communities grow, impervious areas increase. Larger amounts of impervious surfaces cause the volume and rate of storm water runoff to increase. This can result in flooding, stream channel degradation, and increased water pollution in our surface waters.

Storm Water Pollutants Include:

  • Sediment from construction sites
  • Pesticides and nutrients from lawns, parks, and roadsides
  • Bacteria from pet waste
  • Oil and grease from car leaks, gas stations, and industrial areas
  • Trash, such as cigarette butts, paper wrappers, and plastic bottles
  • Illegally dumped pollutants
  • Thermal effects from sun-heated impervious surfaces
  • Salt and sand from snow and ice control applications
  • Illicit connections to storm sewers

Storm Water Management

The traditional approach to storm water management focuses primarily on flood control. Today, our City is required to manage for both water quality and quantity by using practices that infiltrate more rainfall and reduce the volume of storm water runoff.

Storm Water Regulations In Our City

To comply with new federal regulations, our City is required to implement a new storm water management program. Some requirements include:

  1. Managing storm water runoff for water quality protection
  2. Reducing sediment loss from construction sites
  3. Developing ordinances to meet program goals
  4. Inspecting storm drain outlets for unwanted discharges, and
  5. Providing public education and involvement

Awareness & Responsibility

Daily activities can affect water quality. Most rainfall drains untreated to streams and lakes through storm drains in neighborhoods. There are many ways you can prevent storm water pollution:

  1. Wash your car at a carwash or on the lawn, not the driveway
  2. Re-direct roof drains to gardens or other vegetated areas
  3. Properly dispose of all hazardous household waste
  4. Minimize the use of fertilizers, and
  5. Clean up after your pets

File a Storm Water-Related Complaint

This page is part of the public education campaign for our storm water program. Our community is a member of the Iowa Stormwater Education Program. The Iowa Stormwater Education Program provides educational resources and guidance to member communities about storm water management. For additional information, visit