Montana Wastewater Variances: What you need to know

Governing Law and Regulations

Montana Water Quality Act (WQA), Montana Code Annotated (MCA) 75-5-401 to 75-5-405

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Montana Pollutant Discharge Elimination System (MPDES) permits: Administrative Rules of Montana (ARM) 17.30.1301 to 17.30.1387

Discharge permit variances: ARM 17.30.1303, ARM 17.30.1322, and ARM 17.30.1361

On-site wastewater treatment: ARM 17.36.922

Regulatory Agencies

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

Local health boards

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 is authorized by EPA to administer the National Pollutant Discharge Elimination System (NPDES) permit program and to issue individual and general permits (known as MPDES permits in Montana). Montana generally follows the federal requirements for variances from such pretreatment standards for fundamentally different factors (FDF). Variances may be granted from best available technology (BAT) standards for the nonconventional, nontoxic pollutants and any removal credits allowed. Compliance dates may also be extended for facilities that plan to install innovative technology that is either less costly or more effective. See the national section WASTEWATER VARIANCES for more information.

Administration and enforcement. DEQ's Water Protection Bureau is authorized to administer and enforce the state's regulations related to wastewater variances.

Comparison: State vs. Federal


Montana regulations allow for variances to permits or permit conditions. This section outlines the variances ...

>> Read more about Wastewater Variances

State Requirements

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Montana Wastewater Variances Resources

Wastewater Variances Products

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