Indiana Administrative Code
Title 327 - WATER POLLUTION CONTROL DIVISION
Article 5 - INDUSTRIAL WASTEWATER PRETREATMENT PROGRAMS AND NPDES
Rule 5 - NPDES Criteria and Standards for Technology-Based Treatment Requirements
Section 5-3 - Secondary treatment requirements for POTWs
Current through September 18, 2024
Authority: IC 13-14-8; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-3
Affected: IC 13-18
Sec. 3.
(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.
