Regulations last checked for updates: Oct 09, 2025

Title 40 - Protection of Environment last revised: Sep 09, 2029
All TitlesTitle 40Chapter IPart 131Subpart D - Subpart D—Federally Promulgated Water Quality Standards
View all text of Subpart D [§ 131.31 - 131.48]
131.48 - 131.48 xxx
Link to an amendment published at 90 FR 46508, Sept. 29, 2025.
authority: 33 U.S.C. 1251
source: 48 FR 51405, Nov. 8, 1983, unless otherwise noted.
cite as: 40 CFR 131.48
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