NEW Water is allowed to discharge treated wastewater to the Fox River under the guidance and conditions of our Wisconsin Pollutant Discharge Elimination System (WPDES) permit. This permit, renewable every five years, sets the conditions and requirements that determine the degree of treatment we must provide in order to comply with the regulations of the State. The permit includes effluent limits for parameters of concern; monitoring requirements for all influent and effluent streams; sludge processing requirements; reporting requirement; system operating requirements; and Pretreatment Program requirements. If the DNR determines that our existing plant is unable to meet existing conditions, or if they determine that new, stricter limits are necessary, the permit will also included a compliance plan, which stipulates a time period for new construction necessary to comply with these limits.
During the permit renewal process, the DNR closely evaluates historical effluent data, to assess compliance with existing limits and to determine the need to include new or revised limits in the subsequent permit. Current State Codes include criteria for hundreds of compounds, which, if detected in our effluent, could be controlled by a permit limit. Our current permit, which expires June 30, 2019, contains relatively few permit limits, due to the low number of compounds of concern detected in our effluent.