{"data":{"id":"us/40-cfr-141.520","jurisdiction":"us","citation":"40 CFR 141.520","heading":"Is my system subject to the updated watershed control requirements?","body":"If you are a subpart H system serving fewer than 10,000 persons which does not provide filtration, you must continue to comply with all of the filtration avoidance criteria in § 141.71, as well as the additional watershed control requirements in § 141.521.","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":"af1b1d80a44e19f96372c23ded89d298b3c01ad8647caa991f2de759c9819f12","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-141.511","next":"us/40-cfr-141.521"},"notice":"GroundRules: Original legal text. Not legal advice."}