Industrial Pretreatment Program (IPP)

The Industrial Pretreatment Program for the Wayne County Downriver Wastewater Treatment Facility (DWWTF) in Wyandotte was approved by the Department of Natural Resources (now Department of Environmental Quality) on May 1,1986. It is a non-domestic user waste control program to control Industrial Users' wastewater discharges and was developed in accordance with the Clean Water Act, General Pretreatment Regulations 40 CFR 403 and Part 23 Rules of the State of Michigan. The program is continuously updated to incorporate changes in federal and state laws.

Legal authority to implement and enforce the approved Industrial Pretreatment Program is contained in the Sewer Use Ordinance. It was enacted by the County Commission to protect the public health and safety by abating and preventing pollution through regulation and control of the quantity and quality of wastewater discharged into the sanitary sewer system.

User fees consisting of Non-residential User Fees and Annual Industrial Surveillance fees fund the program.

It is a strong and dedicated commitment to the protection of the area's water resources.


  • Prevent the introduction into the publicly-owned treatment Works (POTW) which may interfere with normal operation of the system or the use of disposal of the sludge.
  • Prevent the discharge of pollutants into the POTW which may pass through the system into the atmosphere or into the Detroit River.
  • Improve opportunities to recycle and reclaim industrial wastewater and sludge from the treatment plant.
  • Protect the health and safety of collection system workers and citizens of Wayne County from potentially adverse discharges.

Significant Non-Compliance

An industrial user is in significant non-compliance if its violation meets one (1) or more of the following criteria:

  • Chronic violations of wastewater discharge limits, defined here as those in which sixty-six (66) percent or more of all of the measurements taken during a six (6) month period exceed (by any magnitude) the daily maximum limit or the average limit for the same pollutant parameter.

  • Technical Review Criteria (TRC) violations, defined here as those in which thirty-three (33) percent or more of all of the measurements for each pollutant parameter taken during a six (6) month period equal or exceed the product to the daily maximum limit or the average limit multiplied by the applicable TRC (TRC=1.4 for BOD, TSS, fats, oil, and grease, and 1.2 for all other pollutants except pH);

  • Any other violation of a pretreatment effluent limit (daily maximum or longer-term average) that the County Agency determines has caused, alone or in combination with other discharges, interference or pass through (including endangering the health of POTW personnel or the general public);

  • Any discharge of a pollutant that has caused imminent endangerment to human health, welfare or to the environment or has resulted in POTW's exercise of its emergency authority under Article V of this ordinance (40 CFR 403.8 (f) (s) (vi) (b)) to halt or prevent such discharge;

  • Failure to meet, within 90 days after the schedule date, a compliance schedule milestone contained in a Wastewater Discharge Permit compliance schedule or conciliation agreement for starting construction, completing construction, or attaining final compliance;

  • Failure to provide, within 30 days after the due date, required reports such as baseline monitoring reports, 90-day compliance reports, periodic self-monitoring reports, and reports on compliance with compliance schedules;

  • Failure to accurately report noncompliance;

  • Any other violation or group of violations which Wayne County determines will adversely affect the operation or implementation of the County's Industrial Pretreatment Program.