Michigan Effluent Limitations: What you need to know

Governing Law and Regulations

Water quality standards: Michigan Administrative Code (MAC) r. 323.1041 to 323.1117

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Antidegradation: MAC r. 323.1098

Thermal limitations: MAC r. 323.1069 to 323.1075

Variances: MAC r. 323.1103

Permit standards: MAC r. 323.2136 to 323.2146

Whole effluent toxicity (WET) testing: MAC r. 323.1219

Total maximum daily loads (TMDLs): MAC r. 323.1207

Water-quality-based effluent limitations (WQBELs): MAC r. 323.1201 to 323.1221

Chemical-specific WQBELs: MAC r. 323.1211

Compliance schedules: MAC r. 323.1217

Regulatory Agencies

Michigan Department of Environmental Quality (DEQ)

U.S. Environmental Protection Agency (EPA) Region 5

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Michigan has adopted both federal technology-based and water-quality-based effluent standards. However, the state emphasizes the technology-based approach. Water-quality-based standards are typically applied when the technology-based limitations prove insufficient to achieve regulatory compliance. For more information about EPA's federal requirements, see the national section EFFLUENT LIMITATIONS.

Administration and enforcement. The DEQ administers and enforces the state's effluent limitation regulations.

State Requirements


MAC r. 323.1041 to 323.1117

State water quality standards establish the water quality requirements applicable to the Great Lakes, the connecting waters, and all other surface waters of the state to protect the public health and welfare, to enhance and maintain the quality of water, to protect the state's natural resources, and to serve the purposes of state water protection ...

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State Requirements

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Michigan Effluent Limitations Resources

Effluent Limitations Products

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