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Stormwater Management
What is Stormwater?
Stormwater is rainwater or melted snow that runs off streets, lawns, and other sites.
Why Should I care about Stormwater Management?
Stormwater management is vital to maintaining and improving our water quality and water quantity in Cottage Grove. In developed areas, impervious surfaces, or any surface that causes water to run off the surface at an increased rate of flow such as pavement and roofs, prevent precipitation from soaking into the ground as it would naturally. Instead, in areas with impervious surfaces, water runs rapidly into storm drains, sewer systems, and drainage ditches and can cause:
- Downstream Flooding
- Stream Bank Erosion
- Increased Turbidity from erosion (Turbidity is muddiness created by stirred up sediment)
- Habitat Destruction
- Combined Storm and Sanitary Sewer System Overflows
- Infrastructure Damage
- Contaminated Streams, Rivers, and Coastal Water
How can I be affected?
Stormwater management’s impact on water quality and quantity directly affects your drinking water, water for recreational use, the fish and other wildlife in local bodies of water, and the flooding of downstream homes and businesses. When we pollute our water, everyone is affected.
Is Stormwater Management Required?
Under the Clean Water Act of 1972, it is required that when any U.S. city reaches a population of 10,000 people they are then required to implement some programs and standards to address water pollution. Currently Cottage Grove’s population is 9,950 people, quickly approaching the point where this U.S. law will apply to us.
The 1972 Clean Water Act:
- Established the basic structure for regulating pollutant discharges into the waters of the United States.
- Gave EPA the authority to implement pollution control programs such as setting wastewater standards for industry.
- Maintained existing requirements to set water quality standards for all contaminants in surface waters.
- Made it unlawful for any person to discharge any pollutant from a point source into navigable waters, unless a permit was obtained under its provisions.
- Funded the construction of sewage treatment plants under the construction grants program.
- Recognized the need for planning to address the critical problems posed by non-point source pollution
What is a BMP?
BMP stands for “Best Management Practice” and indicates a device, practice, or method for removing, reducing, or preventing targeted stormwater runoff pollutants from reaching receiving waters.
A link to our BMP Matrix, which outlines the effectiveness and suitability of each BMP in relation to various possible conditions, can be found in the supporting documents below.
You can also find a link to our Stormwater Management Handout, which incudes all the information from our Stormwater webpage, in the supporting documents below.
Supporting Documents
BMP Matrix (361 KB) 
