Section 327IAC5-5-3. Secondary treatment requirements for POTWs

   (a) Secondary treatment and corresponding effluent limitations applicable to discharges from POTWs under section 301(b)(1)(B) of the CWA are defined by EPA at 40 CFR 133.

  (b) Notwithstanding subsection (a), attainment of the following alternative effluent limitations shall be deemed as compliance with secondary treatment requirements under section 301(b)(1)(B) of the CWA for POTWs where a waste stabilization pond constitutes the sole means of providing secondary treatment and the design population equivalent is less than ten thousand (10,000):

Parameter	Monthly Average	Weekly Average
Carbonaceous BOD5	25 mg/l (or 85% removal, whichever is more stringent)	40 mg/l
Total suspended solids	70 mg/l	105 mg/l

  (c) For purposes of this section, "POTWs" also includes semipublic entities, which are defined as public and private entities that provide sewage treatment to a group of people having a quasi-public character, e.g., municipal school corporations, private utilities serving mobile home parks and residential developments, etc. (Water Pollution Control Division; 327 IAC 5-5-3; filed Sep 24, 1987, 3:00 p.m.: 11 IR 647; filed Feb 26, 1993, 5:00 p.m.: 16 IR 1767; readopted filed Jan 10, 2001, 3:23 p.m.: 24 IR 1518; readopted filed Nov 21, 2007, 1:16 p.m.: 20071219-IR-327070553BFA; readopted filed Jul 29, 2013, 9:21 a.m.: 20130828-IR-327130176BFA)