REGULATIONS
Rulings
AD/CVD
Notices
HTSUS
U.S. Code
Regs
More
Ports
About
Updates
Apps
Larger font
Smaller font
SEARCH
Sort by Rank
Titles Ascending
Titles Descending
10 per page
25 Result/page
50 Result/page
Regulations last checked for updates: May 17, 2025
Title 40 - Protection of Environment last revised: Nov 17, 2025
All Titles
Title 40
Chapter I
Part 131
Subpart C - Subpart C—Procedures for Review and Revision of Water Quality Standards
§ 131.20 - State review and revision of water quality standards.
§ 131.21 - EPA review and approval of water quality standards.
§ 131.22 - EPA promulgation of water quality standards.
authority:
33 U.S.C. 1251
source:
48 FR 51405, Nov. 8, 1983, unless otherwise noted.
.list_box li,p,.cm-search-info,.cm-search-detail,.abt span,.expand-collapse_top
Get the CustomsMobile app!