1. (a) The department shall classify each wastewater treatment plant into one of 4 grades based on the complexity and flow capacity of the plant’s processes, ranging from grade I, the lowest, to grade IV.

2. (b) The classification shall be determined by summing the applicable points from Env-Wq 304.28, as follows:

   1. (1) Plants with 30 or fewer points shall be grade I;
   2. (2) Plants with 31-55 points shall be grade II;
   3. (3) Plants with 56-75 points shall be grade III; and
   4. (4) Plants with greater than 75 points shall be grade IV.

3. (c) The department shall re-evaluate a plant’s classification whenever it learns of changes to the plant that may affect its grade, including:

   1. (1) System upgrades;
   2. (2) Process changes; or
   3. (3) Changes in effluent discharge requirements, laboratory processes or control, receiving water classification, water quality criteria, or increased treatment requirements.

4. (d) If as a result of a reevaluation the department changes the grade of a plant, the department shall notify the owner in writing of the change. If the change is to a higher grade, the wastewater treatment plant

   owner shall designate a properly certified operator pursuant to Env-Wq 304.29(a) within one year from the receipt of notification from the department.

Source. (See Revision Note #1 at part heading for Env-Wq 304) #10392, eff 8-1-13; ss by #13755, eff 9-27-23 (see Revision Note #2 at part heading for Env-Wq 304)