Authority: IC 13-14-8; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-2; IC 13-18-3

Affected: IC 13-11-2; IC 13-13-5-1; IC 13-18-4

Sec. 1. (a) A POTW, or a combination of POTWs operated by the same authority, that meets at least one (1) of the following conditions must establish a POTW pretreatment program:

1. (1) Has a total design flow greater than five (5) million gallons per day (mgd) and receives pollutants, from one (1) or more industrial users, that may pass through or interfere with the operation of the POTW.
2. (2) Receives flow subject to pretreatment standards or requirements under 327 IAC 5-18.

(b) A POTW with a design flow of five (5) mgd or less may also be required to develop a POTW pretreatment program if the commissioner determines that a pretreatment program to prevent interference or pass through at the POTW is warranted due to the nature or volume of one (1) or more of the following:

1. (1) Industrial influent.
2. (2) Treatment process upset.
3. (3) Violations of POTW effluent limitations.
4. (4) Contamination of municipal sludge.
5. (5) Other circumstances.

(c) A POTW desiring to modify categorical pretreatment standards under 327 IAC 5-20 must have an approved POTW pretreatment program.

(Water Pollution Control Division; 327 IAC 5-19-1; filed Oct 10, 2000, 3:02 p.m.: 24 IR 304; readopted filed Oct 18, 2024, 1:57 p.m.: 20241113-IR-327230810RFA)