Minnesota Neutralization of Wastes: What you need to know

Governing Law and Regulations

Elementary neutralization unit (ENU): Minnesota Rules (MR) 7045.0020, Subpart 21

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Exemption for on-site neutralization units: MR 7045.0450, Subpart 3, E; MR 7045.0552, Subpart 3, F (interim status)

Eligibility termination: MR 7001.0520, Subpart 4

General facility standards: MR 7045.0652, MR 7045.0655

Inspection requirements: MR 7045.0655, Subpart 3

Operating requirements: MR 7045.0655, Subpart 4

Recordkeeping requirements: MR 7045.0655, Subpart 5

Closure/treatment: MR 7045.0655, Subparts 6 to 7

Regulatory Agency

Minnesota Pollution Control Agency (MPCA) Industrial Division

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

· Rules. Unlike the federal rules, Minnesota's hazardous waste facility exemption for elementary neutralization units applies only to units neutralizing waste generated on-site. Elementary neutralization units used to neutralize waste generated from an off-site source have to be permitted as hazardous waste facilities by MPCA. The state has inspection, operating, recordkeeping, and closure requirements for a neutralization unit (as well as a pretreatment unit, wastewater treatment unit, or combustion waste facility).

Note: The federal facility permit exemption for elementary neutralization units does not distinguish between on-site and off-site units.

· Administration and enforcement. MPCA's Industrial Division administers and enforces the hazardous waste neutralization rules in Minnesota.

State Requirements


MR 7045.0655, Subpart 3

The owner or operator must inspect the elementary neutralization unit for malfunctions and deterioration, operator errors, ...

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State Requirements

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Minnesota Neutralization of Wastes Resources

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