Interagency wastewater systems plan review
Plans for Private Onsite Wastewater Treatment Systems (POWTS) are subject to review by the Department of Safety and Professional Services (DSPS), or may require a joint review by the DNR and DSPS.
Role of the Department of Safety and Professional Services
The DSPS has administrative rules for building plumbing and non-municipal sewer lines, and for Private Onsite Wastewater Treatment Systems. A POWTS is a system that receives domestic quality wastewater and either retains it in a holding tank, or treats it and discharges into the soil, beneath the ground surface. Any system with a final discharge exposing treated wastewater upon the ground surface, or discharging directly into surface waters of the state, is subject to DNR regulation.
Joint DNR/DSPS review process
A POWTS that is classified as "large" and that receives domestic wastewater is subject to a joint agency review process involving both the DNR and DSPS.
An onsite wastewater treatment system of any size that receives non-domestic (or a mixture of domestic and non-domestic) wastewater is subject to DNR regulation, but in certain circumstances DSPS will still issue an approval.