D021 RCRA waste code Chlorinated solvent waste that leaches 100 mg/L or more.

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Based on 40 CFR 261.24
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Characteristic hazardous waste
Chlorobenzene

Chlorobenzene at 100 mg/L or more in the TCLP extract.

Toxic characteristic waste. Waste with chlorobenzene at 100 mg/L or more in the TCLP test. It is a solvent & chemical feedstock.

Is D021 hazardous waste?

Yes. Waste is D021 when the TCLP extract of a representative sample holds chlorobenzene at or above 100 mg/L. That makes it toxic hazardous waste, whatever industry or process it came from.

Compare the chlorobenzene in the TCLP extract with 100 mg/L. A total chlorobenzene result is a different measure, so it can't be compared with this limit.

D021 is a nonacute characteristic. On a required hazardous waste manifest, put D021 in Item 13. See VSQG exemptions and empty-container rules.

What does D021 cover?

D021 applies when a representative sample gives a TCLP extract with chlorobenzene at or above 100 mg/L. The limit is for the extract, not the waste’s total chlorobenzene.

CAS: 108-90-7
Regulatory level: 100 mg/L in TCLP extract
Hazard: T, toxic
Rule: 40 CFR 261.24

Is chlorobenzene waste always D021?

Code	When it fits
D021	The TCLP extract of a representative sample holds chlorobenzene at or above 100 mg/L.
D004–D043	The chlorobenzene result is below 100 mg/L, but another contaminant or characteristic can still apply.
U037	Unused chlorobenzene is thrown away pure, as technical grade, or as the product’s only active ingredient.

Generators decide the codes from testing or knowledge of the waste, under 40 CFR 262.11. A result below 100 mg/L rules out D021 only. It doesn't make the waste nonhazardous.

Which wastes take D021?

Waste	When it’s D021
Contaminated soil	Its chlorobenzene leaches at the TCLP limit or above.
Parts washer solvent	Its chlorobenzene leaches at the TCLP limit or above.
Solvent-contaminated wipes	Its chlorobenzene leaches at the TCLP limit or above.

Which codes sit beside D021?

Code	What it is
D017	2,4,5-TP (Silvex)
D018	Benzene
D019	Carbon tetrachloride
D020	Chlordane
D022	Chloroform
D023	o-Cresol
D024	m-Cresol
D025	p-Cresol