Michigan Bioassays and Biomonitoring: What you need to know

Governing Law and Regulations

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

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Mixing zones: MAC r. 323.1082

Laboratory certification: MAC r. 325.12701 to 325.12707

Laboratory recognition program: MAC r. 324.1401 to 324.1422

Regulatory Agencies

Michigan Department of Natural Resources and Environment (DNRE)

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 regulations follow the federal standards and provide for toxicity testing of discharges into state waters. Test criteria and compounds are included in the permit documentations issued by DNRE and are particular to each facility.

The state characterizes and controls discharges based on whole effluent toxicity (WET). DNRE has established the several types of conditions for WET in National Pollutant Discharge Elimination System (NPDES) permits, including limits, monitoring requirements, and requirements to conduct toxicity reduction evaluations (TREs).

The Michigan Aquatic Toxicology Laboratory further ensures that water quality standards are met by monitoring WET in discharges from wastewater facilities. In addition, DNRE provides guidance on laboratory certification and has a voluntary Laboratory Recognition Program.

Administration and enforcement. DNRE administers and enforces the state's effluent toxicity testing requirements.

State Requirements


MAC r. 323.1219

The state has implemented rules that establish water-quality-based effluent limits (WQBELs) for toxic substances for point source discharges that are protective of the ...

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State Requirements

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Michigan Bioassays and Biomonitoring Resources

Bioassays and Biomonitoring Products

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