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Regulations last checked for updates: Jan 12, 2026
Title 40 - Protection of Environment last revised: Dec 31, 2026
All Titles
Title 40
Chapter I
Part 143
Subpart A - Subpart A—National Secondary Drinking Water Regulations
§ 143.1 - Purpose.
§ 143.2 - Definitions.
§ 143.3 - Secondary maximum contaminant levels.
§ 143.4 - Monitoring.
§§ 143.5-143.9 - §[Reserved]
authority:
42 U.S.C. 300f
source:
44 FR 42198, July 19, 1979, unless otherwise noted.
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