VSQG Requirements: The Very Small Quantity Generator Category (Formerly CESQG)

A lab, clinic, or small research site that generates no more than 100 kg (about 220 lb) of hazardous waste in a calendar month, and never accumulates more than 1,000 kg on site at any time, falls into the smallest of RCRA’s three generator tiers — the Very Small Quantity Generator (VSQG). Before 2016 this same category was called the Conditionally Exempt Small Quantity Generator, or CESQG, and the older name still turns up constantly in older SOPs, state forms, and search results. The rename wasn’t cosmetic-only: the same 2016 rulemaking that renamed the category also added a real new option for VSQGs, on top of the exemptions that were already there. This guide covers what actually changed, what a VSQG still has to do even though it’s exempt from most of RCRA Subtitle C, and where the “still exempt” assumption breaks down. For the mid-tier category above this one, see Small Quantity Generator (SQG) Requirements.

How VSQG Status Is Determined

Generator status under 40 CFR Part 262 is set by the total RCRA hazardous waste generated at a site in a calendar month — evaluated, in most cases, at the facility or campus level, not per individual lab. A site qualifies as a VSQG for a given month only if it meets both conditions:

• Generates 100 kg or less (about 220 lb) of non-acute hazardous waste in that calendar month, and no more than 1 kg of acutely hazardous (P-listed) waste; and
• Never accumulates more than 1,000 kg of hazardous waste on site at any one time.

Because status is calculated monthly, a facility that normally sits comfortably in the VSQG band can cross into SQG or even LQG territory for a single unusually heavy month — a lab clean-out, an equipment failure, an end-of-semester waste push — and that month’s waste is then subject to the higher tier’s requirements. There is no averaging: each calendar month is judged on its own generation total.

What a VSQG Still Has to Do

“Conditionally exempt” describes the relationship correctly: a VSQG is exempt from most of RCRA Subtitle C’s generator standards, but the exemption is conditioned on meeting a short list of real obligations. Under 40 CFR 262.14, a VSQG must:

• Identify all hazardous waste it generates. This is a waste-determination duty, not a bureaucratic filing — every waste stream still has to be evaluated against the RCRA listed (F/K/P/U) and characteristic (D) criteria before it’s set aside, even though nothing has to be filed with EPA to do it. (See RCRA Hazardous Waste Codes for the determination logic.)
• Never exceed the generation and accumulation thresholds above. Exceeding either one, even briefly, moves the site out of VSQG status for that month.
• Ensure the waste is delivered to a person or facility authorized to manage it — a permitted or otherwise authorized treatment, storage, or disposal facility (TSDF), a recycler, or (as of 2016) an affiliated large quantity generator under the consolidation option below. A VSQG cannot simply discard hazardous waste through ordinary trash or sewer disposal.
• Not treat or dispose of the waste itself outside the accumulation and delivery conditions above.

That’s the complete federal list. Unlike an SQG or LQG, a federal VSQG does not need an EPA identification number, does not sign or retain a Uniform Hazardous Waste Manifest for its own shipments in the ordinary case, does not designate an emergency coordinator, does not maintain a written contingency plan, and has no EPA re-notification or biennial-report cycle. There is also no federally mandated recordkeeping format for the waste-identification step — but “no format required” is not the same as “no proof needed” in an inspection. Keeping simple documentation (safety data sheets, a waste-determination log noting which code applies to each stream, receipts or manifests from the receiving facility) is standard practice precisely because a VSQG still has to be able to show an inspector that its waste was identified correctly and its totals stayed under threshold.

The 2016 Generator Improvements Rule: CESQG Becomes VSQG

EPA’s Hazardous Waste Generator Improvements Rule, finalized in 2016, is the rule that renamed the Conditionally Exempt Small Quantity Generator (CESQG) to Very Small Quantity Generator (VSQG). The name change reflects EPA’s own stated reasoning at the time: “conditionally exempt” was widely misread by generators as “doesn’t really apply to me,” when the category has always carried the real conditions described above. Two things are true about this rule and easy to conflate:

• The rename itself did not remove or add to the core VSQG conditions — the 100 kg/month and 1,000 kg on-site thresholds, and the identify/deliver-to-authorized-facility duties, are unchanged from the pre-2016 CESQG standard.
• The same rule did add one genuinely new option for VSQGs: the waste-consolidation provision below, which did not exist under the CESQG rules.

Because RCRA is implemented through authorized state hazardous-waste programs, a state has to adopt the Generator Improvements Rule through its own rulemaking before it takes effect there for state-permitted generators — adoption is not automatic just because the federal rule exists. States differ in how far along that adoption is, and a small number of states run their programs without full EPA authorization, where federal RCRA rules can apply somewhat differently. Confirm which set of generator rules is currently in force with the environmental agency for the specific state before assuming the VSQG name and the consolidation option below are both fully in effect there.

The VSQG-to-LQG Waste Consolidation Option

The genuinely new substantive provision the 2016 rule added: a VSQG may now send its hazardous waste to a large quantity generator (LQG) facility that is under the control of the same person or organization — for example, a satellite campus or clinic consolidating waste at a main research facility operated by the same institution — instead of shipping directly to an off-site TSDF. This did not exist under the old CESQG rules, where a VSQG’s only real option was direct shipment to an authorized TSDF or recycler.

The trade-off is that the receiving LQG facility takes on real responsibility for that waste: it must mark and manage the consolidated VSQG waste under its own full LQG-level Subtitle C obligations, including the accumulation-time clock, manifesting for its eventual off-site shipment, and inclusion in that facility’s own reporting. A VSQG using this option is not simply handing off waste with no paper trail — the receiving LQG’s own compliance burden goes up. For the LQG-side requirements this triggers, see Hazardous Waste Manifest: Completing EPA Form 8700-22.

What a VSQG Doesn’t Need to Worry About

It’s worth stating the contrast plainly, because the SQG and LQG tiers carry obligations that get assumed onto VSQGs by mistake:

• No EPA ID number is federally required for a facility that stays a VSQG for hazardous waste generated on site (some states require one anyway for state-program tracking — check locally).
• No accumulation-time clock like the SQG’s 180/270-day window or the LQG’s 90-day window — the VSQG’s constraint is the 1,000 kg cap, not a calendar.
• No emergency coordinator designation and no written contingency plan.
• No 4-year EPA re-notification cycle — that obligation applies to SQGs, not VSQGs.
• No federal biennial or annual hazardous-waste report at the VSQG tier.

None of this changes if the same facility also handles other regulated waste streams — medical, sharps, radiological, or universal waste run under separate rules with their own thresholds regardless of RCRA hazardous-waste generator status. See Lab Waste Disposal: RCRA Streams, Generator Status, and Disposal Routes for how those streams fit together.

Practical Recordkeeping Checklist

Nothing below is a federal filing requirement in itself — it’s the documentation that lets a VSQG demonstrate, on inspection, that the conditions above are actually being met:

• A waste-determination log or file (SDS references, lab notes, or a simple spreadsheet) showing how each waste stream was classified as hazardous or non-hazardous, and under which RCRA code if applicable.
• A running monthly generation total, so a facility can show it stayed at or under 100 kg for the month in question — and can catch a threshold-crossing month before it becomes a compliance surprise.
• Receipts, manifests, or shipping records from the receiving TSDF, recycler, or affiliated LQG confirming where the waste actually went.
• If using the consolidation option: written confirmation with the receiving LQG facility that it has accepted responsibility for managing the consolidated waste under its own generator status.

Frequently Asked Questions

Is CESQG still a valid term?

The federal category has been called Very Small Quantity Generator (VSQG) since EPA’s 2016 Generator Improvements Rule. “CESQG” is the pre-2016 name for the same core category and still appears in older documents, some state forms, and general usage — the underlying 100 kg/month and 1,000 kg on-site thresholds are the same either way.

Does a VSQG need an EPA identification number?

Not under federal RCRA rules, as long as the facility stays within VSQG thresholds. Some states impose their own ID or notification requirements for VSQG-tier generators, so confirm with the relevant state environmental agency.

Can a VSQG just throw hazardous waste in the regular trash?

No. A VSQG must still ensure its hazardous waste is delivered to a person or facility authorized to treat, store, dispose of, or recycle it — ordinary trash or sewer disposal is not an authorized pathway, regardless of generator tier.

What changed in 2016 besides the name?

The Generator Improvements Rule added the option for a VSQG to consolidate its hazardous waste at a large quantity generator facility under the control of the same person or organization, instead of shipping it directly off site. The core generation/accumulation thresholds and the identify/deliver-to-an-authorized-facility duties were not changed by the rule.

What happens if a VSQG generates more than 100 kg in one month?

That month’s waste is subject to Small Quantity Generator requirements instead — see Small Quantity Generator (SQG) Requirements for the obligations that apply once a site crosses the VSQG threshold, even for a single month.

For the full determination arithmetic shared across all three generator tiers and the mid-tier’s accumulation-clock and reporting duties, see Small Quantity Generator (SQG) Requirements. For the broader waste-stream picture at a research facility, see Lab Waste Disposal: RCRA Streams, Generator Status, and Disposal Routes. For the paperwork an affiliated LQG takes on under the consolidation option, see Hazardous Waste Manifest: Completing EPA Form 8700-22 and Land Disposal Restriction (LDR) Notifications. For how a waste stream gets its RCRA code in the first place, see RCRA Hazardous Waste Codes. For the surrounding compliance framework, see the lab compliance pillar.