U051 RCRA waste code Tar-like wood preservative used on fences & railway sleepers.

Free, no account
Based on 40 CFR 261.33 and EPA guidance
Nothing is stored

U-listed waste
Creosote

U-list unused product.

U-listed hazardous waste for unused creosote, a coal tar wood preservative used on poles & sleepers.

Is U051 hazardous waste?

Yes, when the listing applies. U051 covers creosote thrown away unused, including off-specification product and qualifying residues. It is a U-listed waste, not an acute P-listed one. The listing depends on the product and how it is discarded, not on a TCLP result alone.

U051 is nonacute hazardous waste. On a required hazardous waste manifest, put U051 in Item 13. VSQG exemptions and empty-container rules and pharmaceutical containers still apply.

What does U051 cover?

This covers creosote discarded unused, either pure or technical grade or as the only active ingredient in a formulation. It also covers off-specification batches, residues in nonempty containers and spill cleanup residues of those products. Inactive ingredients in the formulation don't affect this.

CAS: not provided
Table entries: Creosote
Hazard codes in the record: T (toxic)
Rule: 40 CFR 261.33(f)

Is waste creosote always U051?

Code	When it fits
U051	The unused chemical is thrown away, pure or technical grade or as the sole active ingredient. Residues from those products count too.
Characteristic waste (D001–D043)	A used chemical or a different formulation shows a hazardous characteristic. Process listings can apply too.

A listed unused product can also have a characteristic, so more than one row can apply. Merely finding this chemical in a manufacturing waste doesn't make it U051. Match the waste's origin, formulation and use history. Mixing listed waste with solid waste, or treating it, generally doesn't remove the listing. That takes an exclusion, an exception or an approved delisting.

Which wastes take U051?

Waste	When it’s U051
Unused creosote	Discarded commercial product that is pure or technical-grade creosote, or has creosote as its sole active ingredient.

Which codes sit beside U051?

Code	What it is
U047	beta-Chloronaphthalene
U048	o-Chlorophenol
U049	4-Chloro-o-toluidine, hydrochloride
U050	Chrysene
U052	Cresol (cresylic acid)
U053	Crotonaldehyde
U055	Cumene
U056	Cyclohexane