Caltha LLP provides expert consulting and permitting support to wastewater dischargers in Minnesota. Under Federal and Minnesota laws, all discharges of wastewater to the waters of the State require an NPDES permit issued by the Minnesota Pollution Control Agency (MPCA). Caltha staff have permitted all sizes of municipal discharges, industrial discharges, cooling water discharges under MPCA requirements.

In addition, to meet Federal Categorical Effluent Guidelines, State rules, and local pretreatment regulations, many types of wastewater discharges to publicly owned treatment works (POTW) require a pretreatment permit. Caltha staff have also permitted a wide range of these indirect discharges.

The initial step in most permitting efforts is to determine if a MPCA permit is required at all. Caltha works with dischargers and/or their process engineers to determine what State, Federal and local requirements apply. Caltha will assemble the appropriate permit application materials and guide the project through the permitting process.

For some projects, Minnesota impaired waters requirements or Minnesota nondegradation requirements may need to be addressed. Caltha will determine if impaired waters or special waters rules apply and can conduct the necessary analyses to accompany the NPDES permit application. For some projects which exceed specified thresholds, a Minnesota Environmental Quality Board environmental review will need to be completed, which may include preparation of an Environmental Assessment Worksheet, or EAW.

Typical services Caltha provides to wastewater dischargers include:

  • Project review to determine application requirements and expected permit limits
  • NPDES permit application
  • Pretreatment permit application
  • Nondegradtion analysis
  • Environmental Assessment Worksheet (EAW)
  • Preparation of a wastewater permit compliance plan
  • Wastewater discharge monitoring plan
  • Routine reporting and preparation of MPCA Discharge Monitoring Report (DMR)


Caltha LLP | Your Air Permit, Wastewater Permit, Storm Water Permit Partner

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