NR 205.04(16)
(16) “EPA" means the U.S. environmental protection agency.
NR 205.04(32)
(32) “meq" or “meq/l" means milliequivalents or milliequivalents per liter.
NR 205.04(34)
(34) “MGD" or “mgd" means millions of gallons per day.
NR 205.04(40)
(40) “NPDES" means the national pollutant discharge elimination system.
NR 205.04(41)
(41) “pH" means the logarithm of the reciprocal of the hydrogen ion concentration or the negative logarithm of the hydrogen ion concentration.
NR 205.04(43k)
(43k) “PSES" means pretreatment standards for existing sources.
NR 205.04(43n)
(43n) “PSNS" means pretreatment standards for new sources.
NR 205.04(46)
(46) “SS" or “TSS" means total suspended (nonfiltrable) solids.
NR 205.04(47)
(47) “TDS" means total dissolved (filtrable) solids.
NR 205.04(52)
(52) “WPDES" means the Wisconsin pollutant discharge elimination system.
NR 205.04 History
History: Cr.
Register, September, 1984, No. 345, eff. 10-1-84; cr. (40m), (43k) and (43n),
Register, April, 1990, No. 412, eff. 5-1-90
; correction in (intro.) was made under s. 13.93 (2m) (b) 7., Stats.,
Register, May, 2001, No. 545.
NR 205.05
NR 205.05 Rainfall events. The design rainfall amount and probable intensity of 10-year and 25-year, 24-hour rainfall events for locations in Wisconsin shall be determined from the data in table 1, or for a particular location such determination may be made on the basis of more recent rainfall probability data verified by a government agency and approved by the department for this purpose.
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See PDF for table 
NR 205.05 Note
Note: The data of table 1 were obtained by extrapolation from maps published by the National Weather Service in Technical Paper No. 40, “Rainfall Frequency Atlas of the United States".
NR 205.05 History
History: Cr.
Register, September, 1984, No. 345, eff. 10-1-84.
NR 205.06
NR 205.06 Effluent limitations applicable where pH is monitored continuously. When an industrial point source discharger continuously monitors the pH of wastewater in accordance with the requirements of a WPDES permit and the pH limits in the permit are established as part of the effluent limitations applicable to the category of dischargers to which the industrial point source belongs, the permittee shall maintain the pH of such wastewater within the range of the categorical limits, except pH excursions from the range are permitted subject to the following constraints:
NR 205.06(1)
(1) The total time during which the pH values are outside the range of categorical pH limits may not exceed 7 hours and 26 minutes in any calendar month.
NR 205.06(2)
(2) An individual excursion from the range of categorical pH limits may not exceed 60 minutes.
NR 205.06 History
History: Cr.
Register, September, 1984, No. 345, eff. 10-1-84; correction in (3) was made under s. 13.93 (2m) (b) 7., Stats.,
Register, May, 2001, No. 545.
NR 205.065(1)
(1)
Effluent limitations in permits. The department shall impose permit effluent limitations or effluent standards for discharges of pollutants on the discharge point of the permitted facility except as provided in
sub. (2).
NR 205.065(2)
(2) Internal waste streams. The department may impose permit effluent limitations or effluent standards for discharges of pollutants on an internal waste stream when all of the following are true:
NR 205.065(2)(a)
(a) Imposing effluent limitations or standards at the point of discharge is impractical or infeasible.
NR 205.065(2)(b)
(b) The internal waste stream has not mixed with other waste streams or cooling water streams.
NR 205.065(2)(c)
(c) The fact sheet under
ch. NR 201 states the reasons why it is necessary to impose effluent limitations or standards on an internal waste stream.
NR 205.065(3)
(3) Calculation of effluent limitations for POTWs. For continuous dischargers as defined in
s. NR 205.03 (9g) and subject to
ch. NR 210, effluent limitations shall be based on the maximum effluent flow, expressed as a daily average, that is anticipated to occur for 12 continuous months during the design life of the treatment facility unless it is demonstrated to the department that such a design flow rate is not representative of projected flows at the facility.
NR 205.065(4)
(4) Calculation of effluent limitations for other continuous discharges. For all other discharges not subject to
ch. NR 210, effluent limitations shall be calculated based on actual representative flow values except as provided in
pars. (a) and
(b).
NR 205.065(4)(a)
(a) For new discharges, production-based effluent limitations shall be estimated using projected production.
NR 205.065(4)(b)
(b) If a facility is expanding or decreasing production levels, the department may use an estimated alternative production value to calculate production-based effluent limitations.
NR 205.065(5)
(5) Intake water credit. If requested by the permittee in the permit application for issuance or reissuance, technology-based effluent limitations shall, for each substance or parameter, be adjusted to reflect the discharger's intake water if all of the following conditions are met:
NR 205.065(5)(b)
(b) The permittee does not discharge raw water clarifier sludge generated from the treatment of intake water.
NR 205.065(5)(c)
(c) The permittee demonstrates that the applicable technology-based effluent limitation for the pollutant would be met in the absence of the pollutant in the intake water.
NR 205.065(5)(d)
(d) The permittee demonstrates that the constituents of the pollutant in the effluent are substantially similar to the constituents of the pollutant in the intake water. The permittee shall also demonstrate that the intake water is drawn from the same waterbody as defined in
s. NR 106.03 (11m) from into which the discharge is made.
NR 205.065(6)
(6) Maximum intake water credit. If intake credit is granted pursuant to
sub. (5), that intake credit cannot exceed the
maximum value equal to the influent value, and shall be no greater than the value necessary to comply with the applicable permit effluent limitation. Additional monitoring may be included in the permits to determine eligibility for credits and compliance with the applicable limits.
NR 205.065(7)
(7) Effluent Limit expression. Effluent limitations shall be expressed in accordance with this subsection except if the department determines it is impracticable, or if the department determines that different time periods for expressing limitations are needed to ensure compliance with the applicable water quality standard and different time periods are established in another rule provision for a specific pollutant. Water quality-based effluent limitations for toxic pollutants shall be expressed in a permit in accordance with
ch. NR 106. Effluent limitations shall be expressed in accordance with all of the following:
NR 205.065(7)(a)
(a) For continuous dischargers as defined in
s. NR 205.03 (9g) and subject to
ch. NR 210, limitations shall be expressed as average weekly and average monthly discharge limitations.
NR 205.065(7)(b)
(b) For continuous discharges as defined in
s. NR 205.03 (9g) and not subject to
ch. NR 210, limitations shall be expressed as daily maximum and average monthly discharge limitations.
NR 205.065(7)(c)
(c) For seasonal discharges, discharges proportional to stream flow, or other unusual discharge situations that do not meet the definition of a continuous discharge in
s. NR 205.03 (9g), limitations shall be expressed on a case-by-case basis. When determining limitations the department shall consider all of the following factors:
NR 205.065(7)(c)4.
4. Whether the pollutant is subject to other limitations expressed by mass, concentration, or other appropriate measure in the permit.
NR 205.065 Note
Note: An example of a different time period for expressing limits for a specific pollutant or parameter is phosphorus limitations as specified in s.
NR 217.14.
NR 205.065(8)(a)(a) All pollutants limited in permits shall have limitations, standards, or prohibitions expressed in terms of mass, except for any of the following situations:
NR 205.065(8)(a)1.
1. Pollutants limited in permits that cannot be appropriately expressed by mass such as pH, chlorine, temperature, radiation, or other pollutants.
NR 205.065(8)(a)2.
2. When applicable standards and limitations are expressed in terms of other units of measurement.
NR 205.065(8)(a)3.
3. If limitations expressed in terms of mass are infeasible because the mass of the pollutant discharged cannot be related to a measure of operation.
NR 205.065(8)(b)
(b) If a mass limit is included in the permit for a pollutant, the pollutant may also be limited in terms of other units of measurement in the permit, and the permit shall require the permittee to comply with both limitations.
