Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection - Wisconsin Pollutant Discharge Elimination System › Chapter NR 217 - Effluent Standards And Limitations For Phosphorus › Subchapter II - Phosphorus Effluent Standards and Limitations › Section NR 217.04 - Effluent standards and limitations for phosphorus

Current through June 24, 2024
(1) GENERAL.
				  Effluent limitations for total phosphorus shall be imposed in WPDES permits for
				  wastewaters discharged to surface waters as specified in this section.
(a) An effluent standard for total phosphorus
				  shall apply as follows:
1. An effluent
				  limitation equal to 1 mg/L total phosphorus as a monthly average shall apply to
				  publicly owned treatment works and privately owned domestic sewage works
				  subject to ch. NR 210 which discharge wastewater containing more than 150
				  pounds of total phosphorus per month, unless an alternative limitation is
				  provided under sub. (2).
2. An
				  effluent limitation equal to 1 mg/L total phosphorus as a monthly average shall
				  apply in cases where the discharge of wastewater from all outfalls of a
				  facility other than those subject to ch. NR 210 contains a cumulative total of
				  more than 60 pounds of total phosphorus per month, unless an alternative
				  limitation is provided under sub. (2). Outfalls consisting of noncontact
				  cooling water without phosphorus containing additives may not be included in
				  the calculation of the cumulative total of phosphorus discharged from the
				  facility. Compliance with the concentration limit shall be determined as a
				  rolling 12 month average as determined by the total phosphorus from all
				  outfalls subject to the effluent limitation for the most recent 12 months
				  divided by the total flow for all those outfalls for the same period.
3. Effluent limitations for phosphorus equal
				  to 1 mg/L as a monthly average contained in permits on December 1, 1992 shall
				  remain in effect.
4. Effluent
				  limitations for phosphorus equal to 85% removal of influent concentrations of
				  phosphorus contained in permits on December 1, 1992 shall be modified to 1 mg/L
				  total phosphorus as a monthly average upon reissuance of the permit unless an
				  alternative limitation is provided under sub. (2).
5. Runoff to surface waters from animal
				  feeding operations shall be controlled using best management practices to
				  achieve the purpose of this chapter pertaining to phosphorus.
6. The department shall determine if a
				  permittee is discharging more than the applicable threshold value specified in
				  subd. 1. or 2. by examining available data on or requiring monitoring of the
				  amount of phosphorus contained in the wastewater effluent. Such data shall be
				  representative of the amount of phosphorus contained in the wastewater effluent
				  during periods of discharge or operation.
Note: The threshold values of this section will be applied
					 at the time of WPDES permit reissuance or permit modification which may occur
					 due to changes in waste characteristics.
Note: See
					 NR
					 102.06 in reference to water quality standards.