NR 210.05(3)(a) (a) The following effluent limits for BOD5 apply:

NR 210.05(3)(a)1. 1. The 30-day average may not exceed 20 mg/l.

NR 210.05(3)(a)2. 2. The 7-day average may not exceed 30 mg/l.

NR 210.05(3)(a)3. 3. The 30-day average percent removal may not be less than 85%.

NR 210.05(3)(b) (b) The following effluent limits for SS apply:

NR 210.05(3)(b)1. 1. The 30-day average may not exceed 20 mg/l.

NR 210.05(3)(b)2. 2. The 7-day average may not exceed 30 mg/l.

NR 210.05(3)(b)3. 3. The 30-day average percent removal may not be less than 85%.

NR 210.05(3)(c) (c) The effluent pH shall be within the range of 6.0 to 9.0.

NR 210.05(3)(d) (d) The daily minimum effluent dissolved oxygen level shall be 4.0mg/l.

NR 210.05(3)(e) (e) Upon request by the permittee, pursuant to s. NR 210.07 (4),the department may substitute the parameter CBOD5 for the parameter BOD5 and the levels of effluent quality specified in par. (a). The following effluent quality levels of CBOD5will be applicable:

NR 210.05(3)(e)1. 1. The 30-day average may not exceed 16 mg/l.

NR 210.05(3)(e)2. 2. The 7-day average may not exceed 25 mg/l.

NR 210.05(3)(e)3. 3. The 30-day average percent removal may not be less than 85%.

NR 210.05(3)(f) (f) More stringent effluent limitations than those specified in pars. (a) to (e) may be imposed for any pollutant where necessary to meet water quality standards for water receiving the treated discharge.

NR 210.05(4) (4) Effluent limitations may be imposed for pollutants other than those specified in subs. (1) to (3) where necessary to meet water quality standards for waters receiving the treated discharge.

NR 210.05(5) (5) When determining whether more stringent effluent limitations are required under this section to meet water quality standards in the receiving water or downstream waters, the department shall apply the reasonable potential procedures in s. NR 205.067.

NR 210.05 History History: Cr. Register, October, 1986, No. 370, eff. 11-1-86; CR 03-050: r. (2) (c) Register February 2004 No. 578, eff. 3-1-04; correction in (1) (intro.) made under s. 13.93 (2m) (b) 7., Stats., Register February 2004 No. 578; CR 17-002: cr. (5) Register April 2018 No. 748, eff. 5-1-18.

NR 210.06 NR 210.06 Disinfection requirements.

NR 210.06(1) (1) Disinfection requirements. Disinfection shall be required of dischargers subject to the provisions of this chapter when the department determines, based on the information identified in sub. (3), the discharge of wastewater poses a risk to human and animal health. Disinfection shall be required:

NR 210.06(1)(a) (a) From May 1 through September 30 annually to protect recreational uses, or

NR 210.06(1)(b) (b) Year-round to protect public drinking water supplies.

NR 210.06(1)(c) (c) The period during which disinfection under pars. (a) and (b) is required may be adjusted in a WPDES permit where necessary to protect human and animal health.

NR 210.06(2) (2) Effluent limitations. Where and when disinfection is required, the following effluent limitations shall apply:

NR 210.06(2)(a) (a) Bacterial indicators.

NR 210.06(2)(a)1. 1. ‘Recreation protection.’ During the period of disinfection to protect recreational uses as determined under sub. (1) (a) or (c), all of the following shall apply:

NR 210.06(2)(a)1.a. a. The geometric mean of E. coli bacteria in effluent samples collected in any calendar month may not exceed 126 counts/100 mL.

NR 210.06 Note Note: To calculate the geometric mean, a value of 1 should be used for any result of 0.

NR 210.06 Note Note: As specified in ch. NR 102, Table A, for determining attainment or compliance with bacteria criteria or limits, counts are equivalent to either colony forming units or most probable number.