Minnesota Pollution Control Agency (MPCA) finalized new rules on the control of industrial wastewater discharge to Publicly Owned Treatment Works, or POTWs. The Industrial Pretreatment Rule applies to both POTWs and industrial wastewater dischargers that use a POTW. These recent amendments will have the most significant impacts on smaller POTWs that have not been delegated NPDES authority, Industries that have high wastewater flow or higher portion of flow or load to their POTW, regulated as “Significant Industrial Users”.