Brian Barton
The Environmental Protection Agency's (EPA) National Pollutant Discharge Elimination System (NPDES) is a program designed to improve the quality of the nation's streams, rivers, lakes, and estuaries by managing stormwater runoff from urban and suburban areas, construction projects, and industrial sites. To achieve this, the NPDES has introduced Pollutant Reduction Plans (PRPs) as a new requirement for 2018 general permits. These plans outline how municipalities will reduce the pollutant loads entering waterways through MS4 (Municipal Separate Storm Sewer Systems). MS4 communities that discharge into impaired water bodies or the Chesapeake Bay watershed must develop comprehensive strategies, such as impaired water plans or Chesapeake Bay PRPs, to address pollutant load reductions. Tennessee, like other states, is working towards MS4 permit compliance by implementing various measures to prevent and reduce stormwater pollution, including the development of stormwater management programs and the adoption of best management practices (BMPs).
| Characteristics | Values |
|---|---|
| Definition | Municipal Separate Storm Sewer System |
| Owner | State, city, town, village, or other public entity |
| Purpose | Collect or convey stormwater |
| Examples | Storm drains, pipes, ditches |
| Requirements | PRPs, TMDL Plans, BMPs |
| Goals | Reduce pollutants in stormwater runoff, control urban non-point source pollution, treat runoff before it reaches water bodies |
| EPA Resources | Pollution Prevention/Good Housekeeping Fact Sheets, Municipal Pollution Prevention/Good Housekeeping Practices Manual, IDDE Guidance Manual, MS4 Resources Fact Sheet |
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What You'll Learn
The National Pollutant Discharge Elimination System (NPDES)
The Environmental Protection Agency's (EPA) National Pollutant Discharge Elimination System (NPDES) is a program designed to improve the quality of the United States' streams, rivers, lakes, and estuaries. It aims to achieve this by managing stormwater runoff from urban and suburban areas, construction projects, and industrial sites. The NPDES was created to oversee all MS4 permit compliance activities.
MS4, or Municipal Separate Storm Sewer Systems, are conveyances or systems of conveyances owned by a state, city, town, or village that discharge into the waters of the US. These systems are used to collect and convey stormwater and are not part of a publicly-owned treatment works (sewage treatment) plant. Polluted stormwater runoff is often transported through MS4s and discharged untreated into local water bodies.
To prevent harmful pollutants from entering MS4s and subsequently local waterways, operators must obtain an NPDES permit and develop a stormwater management program. This permit requirement, known as Phase I, was issued in 1990 and applies to medium and large cities or counties with populations of 100,000 or more. These entities must obtain NPDES permit coverage for their stormwater discharges.
In recent years, additional requirements have been introduced for MS4 communities. Pollutant Reduction Plans (PRPs) are now mandatory for any MS4 community discharging nutrients and sediments into waters within the Chesapeake Bay watershed or other impaired waterways. These plans outline how municipalities will reduce pollutant loads, specifically targeting nitrogen, phosphorus, and sediment levels associated with stormwater discharges.
To support MS4 communities in achieving their pollutant reduction goals, various resources and guidance documents are available. These include fact sheets, manuals, and technical information on controlling pollution sources, incorporating environmentally sensitive development, and treating runoff before it reaches water bodies. Additionally, stream restoration projects that meet certain criteria are eligible for MS4 credit, incentivizing communities to implement effective restoration measures.
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Municipal Separate Storm Sewer Systems (MS4s)
MS4s are a crucial component of the Environmental Protection Agency's (EPA) National Pollutant Discharge Elimination System (NPDES) program. The NPDES, established under the Clean Water Act, aims to improve the quality of the nation's waterways by managing stormwater runoff from urban, suburban, and industrial areas. To achieve this, operators of MS4s must obtain an NPDES permit and develop a stormwater management program to prevent the discharge of untreated polluted stormwater into local water bodies.
In Tennessee, the NPDES program is implemented through Phase II of the Stormwater Program. This phase focuses on managing stormwater runoff from urban and suburban areas, construction projects, and industrial sites. By obtaining the NPDES permit, MS4 operators in Tennessee are required to develop plans to reduce the pollutant loads entering waterways.
To support MS4 communities in Tennessee and beyond, the EPA has developed several resources and guidelines. These include the Municipal Pollution Prevention/Good Housekeeping Practices Manual, which offers strategies for controlling and reducing stormwater pollution. Additionally, the EPA provides technical information on controlling urban nonpoint source pollution and encourages the adoption of low-impact development (LID) practices to meet stormwater management goals.
To receive credit for their efforts in reducing pollutant loads, MS4 communities can refer to the DEP guidance document. This document outlines the minimum qualifying criteria for stream restoration projects to be eligible for MS4 pollutant load reduction credit. By implementing best management practices (BMPs) and utilizing the resources provided by the EPA, MS4 communities in Tennessee can effectively work towards achieving their pollutant load reduction targets and improving the quality of their local waterways.
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Pollutant Reduction Plans (PRPs)
The National Pollutant Discharge Elimination System (NPDES) was created to oversee all MS4 permit compliance activities. MS4 stands for Municipal Separate Storm Sewer System. These are systems that are owned by a state, city, town, or village and are used to collect stormwater. Pollutant Reduction Plans (PRPs) are a new requirement for 2018 NPDES general permits. PRPs show how a municipality will reduce the pollutant loads entering a waterway.
Any MS4 community that discharges nutrients and sediment into the Chesapeake Bay watershed or into impaired waterways must submit a PRP with their permit application. A combined PRP can be submitted by municipalities located within the Chesapeake Bay watershed that also has impaired waterways. Adjacent municipalities may also submit a joint PRP, which details how they will work together to address pollutant load reductions.
To be eligible for MS4 credit, stream restoration projects must provide documentation to the DEP that demonstrates the project will meet the minimum qualifying criteria. The DEP has outlined many requirements for PRPs, including calculating the existing pollutant loads for nitrogen, phosphorus, and sediment, and identifying BMPs to install to reduce those pollutant loads. BMPs, or Best Management Practices, are outlined in the Menu of BMPs for Construction Site Runoff Control, which provides guidance for MS4s and construction site operators to address stormwater runoff.
The EPA has compiled information related to the MS4 program in the MS4 Resources Fact Sheet. This includes information on how to include a program to reduce pollutants in stormwater runoff from construction activities that disturb at least one acre of land. The EPA also provides technical information on controlling urban nonpoint source pollution and discusses requiring low-impact development (LID) practices to meet stormwater goals.
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Stream restoration projects
In Tennessee, the National Pollutant Discharge Elimination System (NPDES) is responsible for overseeing MS4 permit compliance. To prevent harmful pollutants from entering MS4s, operators must obtain an NPDES permit and develop a stormwater management program. This permit ensures that stormwater runoff, which can carry pollutants from urban, suburban, and industrial areas, is properly managed before being discharged into local waterways.
One of the critical aspects of stream restoration projects is their eligibility for MS4 pollutant load reduction credit. To qualify for this credit, projects must meet the minimum criteria outlined in the Eligibility Checklist provided by the Department of Environmental Protection (DEP). This checklist includes details on how credit is calculated using the default rate and adjustments necessary when armoring is used in the restoration design.
The Eligibility Checklist also offers projects the option to utilize Expert Panel Report Protocols to determine a site-specific load reduction for their restoration efforts. These protocols provide a framework for calculating pollutant load reductions for different types of restoration projects. By following these protocols, stream restoration projects can ensure they are effectively reducing pollutant loads and contributing to the overall improvement of water quality in Tennessee's MS4 communities.
Additionally, Pollutant Reduction Plans (PRPs) are now a requirement for MS4 communities discharging nutrients and sediments into impaired water bodies or those within the Chesapeake Bay watershed. These plans outline how municipalities will reduce pollutant loads, specifically targeting nitrogen, phosphorus, and sediment levels. By implementing PRPs, Tennessee's MS4 communities can make significant strides in reducing the pollution entering their local waterways and improving ecological health.
Tennessee's MS4 communities have access to various resources and guidance documents to support their stream restoration projects and pollutant reduction efforts. These include fact sheets, manuals, and study designs provided by the EPA, such as the Pollution Prevention/Good Housekeeping Fact Sheets, the Urban Stormwater Retrofit Practices Manual, and the Monitoring to Demonstrate Environmental Results guidance. By utilizing these resources, MS4 communities can develop effective strategies to manage stormwater runoff, reduce pollution, and restore the health of their local streams.
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Best Management Practices (BMPs)
The Environmental Protection Agency's (EPA) National Pollutant Discharge Elimination System (NPDES) is a program designed to improve the quality of the nation's streams, rivers, lakes, and estuaries. Phase II of the program focuses on managing stormwater runoff from urban, suburban, and industrial areas to prevent pollution from entering water bodies. Municipal Separate Storm Sewer Systems (MS4s) play a crucial role in this effort by collecting and conveying stormwater. To ensure effective pollutant load reduction, MS4s in Tennessee must implement Best Management Practices (BMPs).
BMPs are strategies and techniques that aim to minimize the impact of human activities on the environment, specifically focusing on preventing pollutants from entering stormwater and, consequently, local water bodies. These practices are essential because preventing pollution is more cost-effective than restoring a polluted waterway.
Tennessee has implemented various BMPs to reduce pollutant loads. For instance, the Tennessee Smart Yards program educates residents on ecologically sound landscaping practices. Additionally, MS4 operators must obtain NPDES permits and develop stormwater management programs to comply with Phase II requirements. This includes implementing inspection and maintenance procedures, as well as staff training, to prevent and reduce stormwater pollutants from activities such as infrastructure maintenance, fleet management, and construction projects.
The EPA provides fact sheets and guidance documents to assist MS4s in selecting and implementing appropriate BMPs. These resources offer information on applicability, implementation, and effectiveness, ensuring that MS4s can make informed decisions. While the list of BMPs is not all-inclusive, MS4s are encouraged to adopt innovative practices that achieve the minimum measures. For example, green infrastructure practices that reduce paved surfaces can help mitigate stormwater impacts from new developments.
Overall, BMPs are a critical component of Tennessee's strategy to reduce pollutant loads. By focusing on prevention and adopting a range of practices, MS4s can effectively protect water quality and safeguard the state's water resources for future generations.
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Frequently asked questions
MS4 is short for Municipal Separate Storm Sewer System. It is a conveyance or system of conveyances that is owned by a state, city, town, village, or other public entity that discharges into waters of the US.
A PRP is a requirement for any MS4 community that discharges nutrients and sediment into the waters of the Chesapeake Bay watershed. It outlines how the municipality will reduce the pollutant loads entering the waterway.
NPDES is a program designed to improve the quality of the nation's streams, rivers, lakes, and estuaries by managing stormwater runoff. It requires operators of MS4s to obtain a permit and develop a stormwater management program.
A PRP includes a schedule to implement best management practices (BMPs) to reduce nitrogen, phosphorus, and sediment associated with stormwater discharges.
MS4 communities can reduce stormwater costs by implementing Low Impact Development (LID) strategies and practices, which capture and treat runoff before it is delivered to water bodies.
