eCFR Reference Browser

---

title: "40 CFR §142.4"

source: "https://www.ecfr.gov/current/title-40/section-142.4"

title_number: "40"

volume_number: "25"

chapter_number: "Unknown"

subchapter_code: "D"

subchapter_subject: "WATER PROGRAMS (CONTINUED)"

part_code: "142"

part_subject: "NATIONAL PRIMARY DRINKING WATER REGULATIONS IMPLEMENTATION"

subpart_code: "A"

subpart_subject: "General Provisions"

section_number: "142.4"

section_subject: "State and local authority."

cfr_reference: "40 CFR 142.4"

title_name: "Title 40"

title_subject: "Protection of Environment"

parts_covered: "Parts 136 to 149"

revised_date: "Revised as of July 1, 2019"

publication_date: "As of July 1, 2019"

contains_description: "Containing a codification of documents of general applicability and future effect"

publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"

---

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.

§142.4 - State and local authority.