Industrial Waste and Pretreatment

• Establish local rules
  • Discharge regulations – MMSD Rules, Chapter 11
  • User charges – MMSD Rules, Chapter 17
• Implement federal and state pretreatment requirements
  • General requirements
  • • 40 CFR 403
    • Wis. Adm. Code, Ch. NR 211
• Categorical standards
  • • 40 CFR 405 to 424
    • 40 CFR 425 to 471
    • Wis. Adm. Code, Chs. NR 221-299
• Process requests for new discharges
  • New industries
  • Changes in process
  • Dewatering due to construction
  • Non-contact cooling water
• Issue permits to significant industrial users
• Monitor local industries and commercial users for compliance with District rules
  • Inspect facilities
  • Monitor discharges
  • Monitor corrective action in response to violations
• Collect water consumption and discharge data
• Provide data for user charge determination for commercial and industrial facilities

• Contact your municipality and the District to determine requirements based on your business and expected needs.
• Submit Notice of Intent to Discharge Non-Domestic Wastewater, if applicable. Use the MMSD Notice of Intent to Discharge Non-Domestic Wastewater instructions.

Dental offices are a significant source of mercury. To reduce discharges of mercury, the Milwaukee Metropolitan Sewerage District requires that dental offices implement best management practices and separators for amalgam.

Resources:

General information regarding reducing discharges of mercury from dental offices
One-Time Compliance Report for Dental Dischargers
ADA
WDA
WI DNR
EPA
Contact us for questions: iwpp@mmsd.com, (414) 272-5100

• User charge parameters
  • Volume
  • Biochemical Oxygen Demand (BOD)
  • Total Suspended Solids (TSS)
• Rates established annually - for information on billings see Budget/Financial
• Water consumption is the basis for volume discharged
• To calculate the mass of BOD and TSS discharged, the District uses either default concentrations or concentrations determined by sample results.
• If you do not discharge process wastewater, but discharge less than your water consumption, then you may submit a Water Balance Form to the District showing the difference, which will reduce your sewer user charges.

• Process wastewater is the focus for pollutants and user charges
• “Process wastewater” is water that contacts a raw material, intermediate product, finished product, or waste product during manufacturing or other processing
• Notify the District before commencing process wastewater discharge
• All dischargers of process wastewater must provide a Water Balance Form to indicate the relative volumes of each type of discharge. 
• Discharges of Non-Contact Cooling Water (NCCW) must be approved by your municipality and the District prior to commencement of discharge. Submission of the District’s Request Form is required.

• A facility is a significant industrial user if
  • Categorical pretreatment standards apply
  • Discharges have the potential to violate a local limit
  • The facility will discharge 25,000 gallons per day or more of process wastewater, unless the District finds no reasonable potential to violate a local limit
• Before discharging
  • Obtain approval from the Wisconsin Department of Natural Resources, if a pretreatment system will be utilized, prior to installation of the system.
  • Provide proof of occupancy for facility
  • Install District approved sampling location(s)
  • Obtain a permit
  • Provide a Baseline Report
• Industrial Honor Roll for 2024