42 U.S. Code § 6939e - Federally owned treatment works
It is unlawful to introduce into a federally owned treatment works any pollutant that is a hazardous waste.
For purposes of this section, the term “federally owned treatment works” means a facility that is owned and operated by a department, agency, or instrumentality of the Federal Government treating wastewater, a majority of which is domestic sewage, prior to discharge in accordance with a permit issued under section 1342 of title 33.
Nothing in this section shall be construed as affecting any agreement, permit, or administrative or judicial order, or any condition or requirement contained in such an agreement, permit, or order, that is in existence on October 6, 1992, and that requires corrective action or closure at a federally owned treatment works or solid waste management unit or facility related to such a treatment works.
 So in original. Probably should be singular.