Wis. Admin. Code NR § 210.205
Permittees that own and operate combined sewer systems, including combined sewage treatment facilities, shall comply with the specific requirements contained in the WPDES permit. Permittees that operate a combined sewer system shall be subject to the requirements of ss. NR 210.23 and NR 210.24. Discharges from combined sewer systems and overflows from combined sewage treatment facilities shall be reported to the department as required in the WPDES permit and the public shall be notified of such discharges in accordance with the emergency response plan required under s. NR 210.23(4) (f). The department may require the permittee to notify the owner of a drinking water intake located in a surface water receiving any discharges from combined sewer systems.
Wis. Admin. Code Department of Natural Resources § NR 210.205
The department may consult with the requirements of 33 U.S.C. 1342 and U. S. environmental protection agency guidance when establishing permit conditions for combined sewer systems.