{"data":{"id":"us/40-cfr-141.542","jurisdiction":"us","citation":"40 CFR 141.542","heading":"What must my system do if we are considering a significant change to disinfection practices?","body":"If your system is considering a significant change to its disinfection practice, your system must calculate a disinfection benchmark(s) as described in §§ 141.543 and 141.544 and provide the benchmark(s) to your State. Your system may only make a significant disinfection practice change after consulting with the State for approval. Your system must submit the following information to the State as part of the consultation and approval process:\n(a) A description of the proposed change;\n(b) The disinfection profile for Giardia lamblia (and, if necessary, viruses) and disinfection benchmark;\n(c) An analysis of how the proposed change will affect the current levels of disinfection; and\n(d) Any additional information requested by the State.","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":"d6f433f402e47a6ee9184e2e93e49aae6016b31d1491789a84da6195479bb3d1","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-141.541","next":"us/40-cfr-141.543"},"notice":"GroundRules: Original legal text. Not legal advice."}