Section 210.05. Effluent limitations.

  Publicly owned treatment works and privately owned domestic sewage treatment works shall meet as a minimum the effluent limits specified in this section.

(1)  Where the receiving water is classified as fish and aquatic life in s. NR 102.04 (3) :

(a) The following effluent limits for BOD 5 apply:

1. The 30-day average may not exceed 30 mg/l.

2. The 7-day average may not exceed 45 mg/l.

3. The 30-day average percent removal may not be less than 85%.

(b) The following effluent limits for SS apply:

1. The 30-day average may not exceed 30 mg/l.

2. The 7-day average may not exceed 45 mg/l.

3. The 30-day average percent removal may not be less than 85%.

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

(d) Upon request by the permittee, pursuant to s. NR 210.07 (4) , the department may substitute the parameter CBOD 5 for the parameter BOD 5 and the levels of effluent quality specified in par. (a) . The following effluent quality levels of CBOD 5 shall be applicable:

1. The 30-day average may not exceed 25 mg/l.

2. The 7-day average may not exceed 40 mg/l.

3. The 30-day average percent removal may not be less than 85%.

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

(2)  Where the receiving water is classified as intermediate aquatic life as defined in s. NR 104.02 (3) (a) :

(a) The following effluent limits for BOD 5 apply:

1. The 30-day average may not exceed 15 mg/l.

2. The daily maximum may not exceed 30 mg/l.

3. The 30-day average percent removal may not be less than 85%.

(b) The following effluent limits for SS apply:

1. The 30-day average may not exceed 20 mg/l.

2. The daily maximum may not exceed 30 mg/l.

3. The 30-day average percent removal may not be less than 85%.

(d) The effluent pH shall be within the range of 6.0 to 9.0.

(e) The daily minimum effluent dissolved oxygen level shall be 4.0mg/l.

(f) Upon request by the permittee, pursuant to s. NR 210.07 (4) ,the department may substitute the parameter CBOD 5 for the parameter BOD 5 and the levels of effluent quality specified in par. (a) . The following effluent quality levels of CBOD 5 shall be applicable:

1. The 30-day average may not exceed 12 mg/l.

2. The daily maximum may not exceed 25 mg/l.

3. The 30-day average percent removal may not be less than 85%.

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

(3)  Where the receiving water is classified as marginal surface water as defined in s. NR 104.02 (3) (b) :

(a) The following effluent limits for BOD 5 apply:

1. The 30-day average may not exceed 20 mg/l.

2. The 7-day average may not exceed 30 mg/l.

3. The 30-day average percent removal may not be less than 85%.

(b) The following effluent limits for SS apply:

1. The 30-day average may not exceed 20 mg/l.

2. The 7-day average may not exceed 30 mg/l.

3. The 30-day average percent removal may not be less than 85%.

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

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

(e) Upon request by the permittee, pursuant to s. NR 210.07 (4) ,the department may substitute the parameter CBOD 5 for the parameter BOD 5 and the levels of effluent quality specified in par. (a) . The following effluent quality levels of CBOD 5 will be applicable:

1. The 30-day average may not exceed 16 mg/l.

2. The 7-day average may not exceed 25 mg/l.

3. The 30-day average percent removal may not be less than 85%.

(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.

(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.

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 .