U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jul 24, 2024

§ 261.24 - Toxicity characteristic.

(a) A solid waste (except manufactured gas plant waste) exhibits the characteristic of toxicity if, using the Toxicity Characteristic Leaching Procedure, test Method 1311 in “Test Methods for Evaluating Solid Waste, Physical/Chemical Methods,” EPA Publication SW-846, as incorporated by reference in § 260.11 of this chapter, the extract from a representative sample of the waste contains any of the contaminants listed in table 1 at the concentration equal to or greater than the respective value given in that table. Where the waste contains less than 0.5 percent filterable solids, the waste itself, after filtering using the methodology outlined in Method 1311, is considered to be the extract for the purpose of this section.

(b) A solid waste that exhibits the characteristic of toxicity has the EPA Hazardous Waste Number specified in Table 1 which corresponds to the toxic contaminant causing it to be hazardous.

Table 1—Maximum Concentration of Contaminants for the Toxicity Characteristic

EPA HW No. 1 Contaminant CAS No. 2 Regulatory Level (mg/L)
D004Arsenic7440-38-25.0
D005Barium7440-39-3100.0
D018Benzene71-43-20.5
D006Cadmium7440-43-91.0
D019Carbon tetrachloride56-23-50.5
D020Chlordane57-74-90.03
D021Chlorobenzene108-90-7100.0
D022Chloroform67-66-36.0
D007Chromium7440-47-35.0
D023o-Cresol95-48-7 4 200.0
D024m-Cresol108-39-4 4 200.0
D025p-Cresol106-44-5 4 200.0
D026Cresol 4 200.0
D0162,4-D94-75-710.0
D0271,4-Dichlorobenzene106-46-77.5
D0281,2-Dichloroethane107-06-20.5
D0291,1-Dichloroethylene75-35-40.7
D0302,4-Dinitrotoluene121-14-2 3 0.13
D012Endrin72-20-80.02
D031Heptachlor (and its epoxide)76-44-80.008
D032Hexachlorobenzene118-74-1 3 0.13
D033Hexachlorobutadiene87-68-30.5
D034Hexachloroethane67-72-13.0
D008Lead7439-92-15.0
D013Lindane58-89-90.4
D009Mercury7439-97-60.2
D014Methoxychlor72-43-510.0
D035Methyl ethyl ketone78-93-3200.0
D036Nitrobenzene98-95-32.0
D037Pentachlorophenol87-86-5100.0
D038Pyridine110-86-1 3 5.0
D010Selenium7782-49-21.0
D011Silver7440-22-45.0
D039Tetrachloroethylene127-18-40.7
D015Toxaphene8001-35-20.5
D040Trichloroethylene79-01-60.5
D0412,4,5-Trichlorophenol95-95-4400.0
D0422,4,6-Trichlorophenol88-06-22.0
D0172,4,5-TP (Silvex)93-72-11.0
D043Vinyl chloride75-01-40.2

1 Hazardous waste number.

2 Chemical abstracts service number.

3 Quantitation limit is greater than the calculated regulatory level. The quantitation limit therefore becomes the regulatory level.

4 If o-, m-, and p-Cresol concentrations cannot be differentiated, the total cresol (D026) concentration is used. The regulatory level of total cresol is 200 mg/l.

[55 FR 11862, Mar. 29, 1990, as amended at 55 FR 22684, June 1, 1990; 55 FR 26987, June 29, 1990; 58 FR 46049, Aug. 31, 1993; 67 FR 11254, Mar. 13, 2002; 71 FR 40259, July 14, 2006]