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Division of Water Resources

Stormwater Permitting Phase I MS4s

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6th Floor, L & C Annex
401 Church Street, Nashville, TN 37243
(615) 532-0625
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Stormwater Permits

NPDES Industrial
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Phase I MS4
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EPA Phase II Guide

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In response to the 1987 Amendments to the Clean Water Act (CWA), the U.S. Environmental Protection Agency (EPA) developed Phase I of the NPDES Stormwater Program in 1990. Under Phase I, EPA required NPDES permit coverage for stormwater discharges from:


"Medium" and "large" municipal separate storm sewer systems (MS4s) located in incorporated places or counties with populations of 100,000 or more


Eleven categories of industrial activity, one of which is construction activity that disturbs one or more acres of land.


This page contains information related to MS4s.


EPA's Stormwater Website


EPA's Phase I Web Page


The following are already permitted
Cities in Tennessee:


Knoxville: TNS068055
City of Knoxville’s Stormwater Web Page


Nashville: TNS068047
City of Nashville’s Stormwater Web Page


Memphis: TNS068276
City of Memphis’s Stormwater Web Page


Chattanooga: TNS068063
City of Chattanooga’s Stormwater Web Page


Tennessee Department of Transportation (TDOT) Municipal Separate Storm Sewer System (MS4)
Permit Number TNS077585