State by state may differ, but here is some info from a 2005 EPA document
Specifically, generators of more than 1,000 kilograms of hazardous
waste in a month (considered large quantity generators (LQGs)) are
required to comply fully with the federal hazardous waste regulations.
On the other hand, generators of more than 100 kilograms but less than
1,000 kilograms of hazardous waste in a calendar month (considered
small quantity generators (SQGs)) are subject to the RCRA hazardous
waste management standards, but are allowed to comply with certain
reduced regulatory requirements (see 40 CFR 262.34(d), (e), and (f)).
In addition, under 40 CFR 261.5, conditionally-exempt small quantity
generators (CESQGs), defined as facilities that generate less than 100
kilograms of hazardous waste in a calendar month, are not subject to
the RCRA subtitle C hazardous waste management standards, provided they
send their waste to a municipal solid waste landfill or non-municipal
nonhazardous waste facility approved by the state for the management of
CESQG wastes. Finally, households that generate spent mercury-
containing equipment are exempt from the federal hazardous waste
management requirements under the household hazardous waste exemption
in 40 CFR 261.4(b)(1).
http://www.epa.gov/fedrgstr/EPA-WAST...-05/f15437.htm
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