{"data":{"id":"us/40-cfr-141.502","jurisdiction":"us","citation":"40 CFR 141.502","heading":"When must my system comply with these requirements?","body":"You must comply with these requirements in this subpart beginning January 1, 2005, except where otherwise noted.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER D—WATER PROGRAMS","PART 141—NATIONAL PRIMARY DRINKING WATER REGULATIONS","Subpart T—Enhanced Filtration and Disinfection—Systems Serving Fewer Than 10,000 People"],"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":"2723e297199a9f9588bec33a64a45f68c3314edea71f03db9f3f6ca5c02f8274","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-141.501","next":"us/40-cfr-141.503"},"notice":"GroundRules: Original legal text. Not legal advice."}