Montana Effluent Limitations: What you need to know

Governing Law and Regulations

Montana Water Quality Act, Montana Code Annotated (MCA) 75-5-101 to 75-5-1122

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Effluent limitations: Administrative Rules of Montana (ARM) 17.30.1207

Montana Pollutant Discharge Elimination System (MPDES) permits: ARM 17.30.1201 to 17.30.1387

Water quality standards: ARM 17.30.1207 and ARM 17.30.620 to 17.30.670

Stream classifications: ARM 17.30.606 and MCA 75.5.301 to 75.5.316

Mixing zones: ARM 17.30.505

Nondegradation of water quality: ARM 17.30.701 to 17.30.718

Exemptions: ARM 17.30.716

Subsurface water treatment systems (SWTSs): ARM 17.30.718

Regulatory Agencies

Montana Department of Environmental Quality (DEQ) Permitting and Compliance Division Water Protection Bureau

DEQ Board of Environmental Review (Board)

DEQ Water Pollution Control Advisory Council

U.S. Environmental Protection Agency (EPA) Region 8

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Montana has adopted by reference the federal effluent limitations; however, the state effluent limitations apply to both surface and groundwater discharges. The state's Montana Pollutant Discharge Elimination System (MPDES) requirements mandate that best available technology (BAT) be used to treat effluent for the removal of certain pollutants. Typically, all MPDES permits must be renewed every 5 years, with the Montana Department of Environmental Quality (DEQ) reviewing all applications to ensure that the discharges would not cause a violation of water quality in the receiving stream.

The state has adopted and incorporated by reference the federal standards that are applicable to owners and operators of specified point ...

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State Requirements

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Montana Effluent Limitations Resources

Effluent Limitations Products

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