GUIDE
LQG vs. SQG vs. VSQG
Written by US Waste Index · Published Aug 28, 2026 · Last reviewed Aug 28, 2026 · not yet independently reviewed by a third-party subject-matter expert — see Editorial Policy
EPA sorts hazardous-waste generators into three size classes — LQG, SQG, and VSQG — based on how much hazardous waste a facility generates in a calendar month, not on how dangerous the waste is or what industry the facility is in. As of the August 26, 2026 snapshot, a real SQG facility on US Waste Index shows what this classification looks like in practice.
Generator size is about volume, not danger
A generator's size class (see our guide on the generator role generally) is a threshold based on the quantity of hazardous waste it generates per calendar month, plus how much it accumulates on-site — it says nothing about how hazardous the waste itself is. A facility generating a small volume of highly dangerous waste and one generating a larger volume of a milder hazardous waste can land in different size classes for reasons that have nothing to do with relative danger.
VSQG — Very Small Quantity Generator
The smallest class, for facilities generating minimal monthly quantities of hazardous waste. VSQGs face the lightest set of RCRA requirements of the three classes, though they still must properly identify and manage their waste.
SQG — Small Quantity Generator
The middle class, for facilities generating more than the VSQG threshold but less than the LQG threshold in a given month. SQGs face more recordkeeping and accumulation-time requirements than VSQGs, but less than LQGs.
LQG — Large Quantity Generator
The largest class, for facilities generating at or above the LQG threshold in a given month. LQGs face the most extensive RCRA requirements of the three — the shortest on-site accumulation time limits and the most detailed recordkeeping and reporting obligations.
Why the size class matters
The size class determines which specific RCRA rules apply to a facility — how long it can store waste on-site, what records it has to keep, and what reporting is required. It's a different axis entirely from a facility's handler role (generator vs. Transporter vs. TSDF, see our guide on that) — a facility's permit records can show a size class and a role together.
A real example: reading a generator's size class
Below is a real facility's compliance record showing its generator size classification alongside its other RCRA-sourced fields, from the same data every profile on this site uses.
SMITH INTERNATIONAL INC
EPA public recordHOUSTON, TX · Registry ID 110000462133 · RCRA handler ID TXD000729426
- Handler classification(s)
- SQG, Transporter
- Recorded violations
- 3
- Open violations
- 0
- Significant non-complier
- No
- Total penalties (5-yr)
- —
- Inspections (5-yr)
- 1
As of Aug 26, 2026. View this facility's full record →
FAQ
What does LQG, SQG, and VSQG stand for?
Large Quantity Generator, Small Quantity Generator, and Very Small Quantity Generator — the three RCRA size classes for facilities that generate hazardous waste.
How is a generator's size class determined?
By the quantity of hazardous waste it generates per calendar month and how much it accumulates on-site — not by how dangerous the waste is or what industry the facility is in.
Does a bigger size class mean more dangerous waste?
No. Size class is a volume threshold, not a danger rating. A facility handling a small quantity of highly hazardous waste can be a smaller size class than one generating a larger quantity of a less hazardous type.
Do LQGs face stricter rules than SQGs and VSQGs?
Yes — LQGs face the shortest on-site accumulation time limits and the most detailed recordkeeping and reporting requirements of the three classes.
Is generator size class the same as handler role?
No — they're different axes. Handler role (generator, Transporter, TSDF) describes what a facility does with hazardous waste; size class describes how much a generator specifically produces. See our guide on the three handler roles for that distinction.
Primary sources
This guide is reference material compiled by US Waste Index, not original regulatory guidance — verify anything time-sensitive or high-stakes directly against these primary sources.