Municipal Separate Storm Sewer Systems (MS-4)

Prevent stormwater pollution (3)What Is an MS4?

The government owns an MS4 system and helps move rainwater and melted snow away from our streets and buildings. It includes things like storm drains, pipes, and ditches. It's important to know that it doesn't mix with the water from our toilets and sinks and is not part of a place that cleans sewage. Its main job is to prevent flooding and keep our water clean., 



Sometimes when it rains, the water that runs off from our streets and buildings can get really dirty. This dirty water is called stormwater runoff. There are special systems called Municipal Separate Storm Sewer Systems (MS4s) that help move this dirty water away. But sometimes, this dirty water is released into local water bodies without being cleaned first, which can harm the environment.

To make sure the dirty water doesn't harm our environment, the people who own and operate the MS4s need to get a special permit. This permit is called the National Pollutant Discharge Elimination System (NPDES) permit. They also have to come up with a plan to manage the stormwater and keep it clean.

There are two(2) phases of these regulations.

  • Phase I applies to big cities or certain counties with lots of people.
  • Phase II applies to smaller areas. The goal is to reduce pollution in stormwater runoff and stop any illegal dumping.

These rules were made to follow the federal Clean Water Act and make sure we have more clean water bodies where we can swim and fish safely.

What is the City of Ozark doing?

 The City of Ozark is doing its part to protect water resources. They support an organization called the James River Basin Partnership (JRBP), which teaches people about water quality. They even organize events and go to schools to teach students about water and stormwater issues.

 The City of Ozark also gets the public involved in protecting the environment. They have meetings where people can share their thoughts and concerns. They also organize clean-up events and support volunteers who clean up local streams and rivers. They care about the environment and want to keep our water clean for everyone to enjoy.

 If you want to learn more about protecting our water, you can visit the James River Basin Partnership's website.

  1. Timothy Auchtung

    Safety Compliance & MS4 Coordinator

Minimum Control Measures

The MS4 Program contains elements called minimum control measures that when implemented should result in a significant reduction in pollutants discharged into receiving waters. The minimum measures are outlined below: 

Ozark's Annual MS4 Report to Missouri Dept. of Natural Resources

What can you do to help?

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