Below is a link to the TxDOT MS4 area map. TxDOT’s MS4 area is defined as the state highway right of way (ROW) within urbanized areas. If you plan to discharge construction stormwater into TxDOT's MS4 area (ie, the ROW within urbanized areas), you must provide a copy of your signed NOI to the district to which you are discharging. To email the NOI to the district, select your construction project’s location within the MS4 area map for the district’s email address, or you can mail a paper copy of the NOI to: Environmental Affairs Division, ERM Stormwater Section, 125 E. 11th St. - Austin, TX 78701. Please write the name of the district on top of the NOI so it can be directed to the district.

Title Date Description Format
MS4 Notice of Intent (NOI) 04/18 This map shows the TxDOT MS4 areas and districts. To determine the district NOI contact, click the location that you are discharging to for the district’s email address, or it can be mailed to Environmental Affairs Division, 125 E. 11th St. - Austin, TX 78701

Divisions