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Industrial Waste & Pretreatment

Federal and state laws require the District to operate an Industrial Waste Pretreatment Program. The Wisconsin Department of Natural Resources approved the District's program in 1983.

MMSD regulates industrial wastewater to:

  • Help protect Lake Michigan.
  • Prevent the discharge of pollutants that could damage sewers or treatment plants.
  • Maintain high quality production of Milorganite fertilizer.
  • Avoid violations of the District's discharge limits from our treatment plants.
  • The District currently issues permits to approximately 125 industrial facilities. Permits implement a combination of environmentally-based local limits and federal technology-based limits.

The program works primarily with industries, however, for mercury reduction, our engineers also work with dental offices, schools and health care facilities.  This group is also responsible for the administration of user charge verification and industrial billing activities.   

Regulated industries must follow the District’s rules and may be required to obtain a permit before discharging their wastewater.  This program has been very successful, reducing pollutants by 90% or more in many cases.  If you would like more information about the effectiveness of this program, please see the following links:

Source Reduction Effectiveness Analysis - 2015

Mercury Pollutant Minimization Program Report – 2015


If you are a new or current industry and need information about the Industrial Waste Pretreatment Program, please see the following links:

Notice of Intent Instructions

Notice of Intent Form

Discharge Regulations and Enforcement Procedures (MMSD Rules Chapter 11)


If you have questions about billings, see:

Cost Recovery Procedures Manual

Waste Strength Certification/Water Balance Instructions

Waste Strength Certification/Water Balance Form