Wis. Admin. Code Public Service Commission PSC 187.03
This chapter applies to any person who connects a sewer main extension into a sewer main for which there has been a developer contribution, and whose property is outside of the subdivision of the developer who made the developer's contribution. A person making a sewer main extension from a previously installed sewer main extension for which a developer is paying or has paid shall pay to the developer a fee as defined under s. PSC 187.05. This chapter does not apply to a combined water and sewer utility under s. 66.0819, Stats.
Wis. Admin. Code Public Service Commission PSC 187.03
This chapter does not apply to limit any sewerage service charges or other means of collecting costs of providing wastewater treatment service as permitted under s. 66.0821, Stats., by municipalities owning wastewater facilities or portions thereof for which no developer contribution has been made.