Regulations last checked for updates: Mar 13, 2025

Title 40 - Protection of Environment last revised: Nov 13, 2025
§ 261.199 - Special requirements for incompatible materials.

(a) Incompatible materials must not be placed in the same tank system.

(b) Hazardous secondary material must not be placed in a tank system that has not been decontaminated and that previously held an incompatible material.

source: 45 FR 33119, May 19, 1980, unless otherwise noted.
cite as: 40 CFR 261.199