Requests for sewer design-related revisions to existing permits prior to completion of sewer work under the permit, or to make minor changes to stormwater detention facilities, must include:

• A letter from the design engineer of the permit describing the design changes and the reason for the changes.
• A letter from the municipal/system engineer of the permit granting approval of the changes.
• A copy of revised design drawings, with each sheet signed and sealed by the permit design engineer of record (only those plan sheets that are changed).
• A copy of all revised permit documents signed and sealed by the permit design engineer of record (if applicable).
• Permit revision fee payment $500.00 plus $5.00 per linear foot of additional sewer length. Fees are waived for governmental sewer projects (public sewer mains, laterals for fire/police stations, libraries, etc.)

Letters requesting a revision to an issued permit can be addressed to:

Adam Witek 
Engineering Department - Local Sewer Systems Section
Metropolitan Water Reclamation District of Greater Chicago 
111 East Erie Street 
Chicago, IL 60611-2893

Please submit PDF files of the required letters, revised drawings, and any additional documentation by email to WMOInbox@mwrd.org