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40 CFR §261.22

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)A solid waste exhibits the characteristic of corrosivity if a representative sample of the waste has either of the following properties:
    1. (1)It is aqueous and has a pH less than or equal to 2 or greater than or equal to 12.5, as determined by a pH meter using Method 9040C in “Test Methods for Evaluating Solid Waste, Physical/Chemical Methods,” EPA Publication SW-846, as incorporated by reference in § 260.11 of this chapter.
    2. (2)It is a liquid and corrodes steel (SAE 1020) at a rate greater than 6.35 mm (0.250 inch) per year at a test temperature of 55 °C (130 °F) as determined by Method 1110A in “Test Methods for Evaluating Solid Waste, Physical/Chemical Methods,” EPA Publication SW-846, and as incorporated by reference in § 260.11 of this chapter.
  2. (b)A solid waste that exhibits the characteristic of corrosivity has the EPA Hazardous Waste Number of D002.