{"data":{"id":"us/40-cfr-142.4","jurisdiction":"us","citation":"40 CFR 142.4","heading":"State and local authority.","body":"Nothing in this part shall diminish any authority of a State or political subdivision to adopt or enforce any law or regulation respecting drinking water regulations or public water systems, but no such law or regulation shall relieve any person of any requirements otherwise applicable under this part.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER D—WATER PROGRAMS","PART 142—NATIONAL PRIMARY DRINKING WATER REGULATIONS IMPLEMENTATION","Subpart A—General Provisions"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"91e0d50110693e4ce5cf2ae1dea7ce1dd97b739999a4bf1cbc8fa2d1e4989642","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-142.3","next":"us/40-cfr-142.10"},"notice":"GroundRules: Original legal text. Not legal advice."}