Massachusetts Accumulation Time: What you need to know

Governing Law and Regulations

Accumulation standards for large quantity generators (LQGs): 310 Code of Massachusetts Regulations (CMR) 30.340

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Small quantity generators (SQGs):

Accumulation period: 310 CMR 30.351

Accumulation commencement date: 310 CMR 30.351(5)


Accumulation commencement date: 310 CMR 30.341(6)

Regulatory Agency

Massachusetts Department of Environmental Protection (DEP) Bureau of Waste Prevention Business Compliance Division

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. The federal accumulation time rules set forth the length of time that each class of generator may store hazardous waste on-site without a storage facility permit. Massachusetts follows the federal rules with a few exceptions. Unlike the federal rules, the state rules for SQGs (persons generating 100 kilograms (kg) or more but less than 1,000 kg of hazardous waste per month) do not allow them to store hazardous waste on-site for more than 180 days. The accumulation commencement date is also specified in the state regulations for SQGs and LQGs. In addition, because Massachusetts regulates waste oil as a hazardous waste, the state's accumulation time rules apply not only to hazardous waste but to waste oil as well. These requirements make the state accumulation time rules more stringent than the federal rules.

DEP follows the federal accumulation time standards from March 2000 that allow LQGs that generate wastewater treatment sludges from the metal finishing industry (i.e., EPA Waste F006) to accumulate F006 beyond the usual 90-day LQG limitation.

For generator on-site hazardous waste and waste oil storage ...

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State Requirements

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Massachusetts Accumulation Time Resources

Accumulation Time Products

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