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A treatment agreement (TA) is needed if a Significant Industrial User (SIU) discharges to a publicly owned treatment works (POTW). An SIU is an industrial user of a POTW that meets any one of the following conditions:
Upon a finding that an industrial user meeting the criteria in paragraph 1 or 2 has no reasonable potential for adversely affecting operation of the POTW or for violating any pretreatment standard or requirement, the DNR may, on its own initiative or in response to a request from an industrial user or POTW, determine that an industrial user is not a significant industrial user.