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Title 40

Displaying title 40, up to date as of 7/09/2026. Title 40 was last amended 7/09/2026.
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Title 40Protection of EnvironmentPart / Section
Chapter IEnvironmental Protection Agency1 – 1099
Subchapter DWater Programs100 – 149
Part 142National Primary Drinking Water Regulations Implementation142.1 – 142.313
Subpart AGeneral Provisions142.1 – 142.4
§ 142.1Applicability.
§ 142.2Definitions.
§ 142.3Scope.
§ 142.4State and local authority.
Subpart BPrimary Enforcement Responsibility142.10 – 142.19
Subpart CReview of State-Issued Variances and Exemptions142.20 – 142.24
§ 142.20State-issued variances and exemptions under Section 1415(a) and Section 1416 of the Act.
§ 142.21State consideration of a variance or exemption request.
§ 142.22Review of State variances, exemptions and schedules.
§ 142.23Notice to State.
§ 142.24Administrator's rescission.
Subpart DFederal Enforcement142.30 – 142.34
Subpart EVariances Issued by the Administrator Under Section 1415(a) of the Act142.40 – 142.46
Subpart FExemptions Issued by the Administrator142.50 – 142.57
Subpart GIdentification of Best Technology, Treatment Techniques or Other Means Generally Available142.60 – 142.65
Subpart HIndian Tribes142.72 – 142.78
§ 142.72Requirements for Tribal eligibility.
§ 142.76Request by an Indian Tribe for a determination of eligibility.
§ 142.78Procedure for processing an Indian Tribe's application.
Subpart IAdministrator's Review of State Decisions that Implement Criteria Under Which Filtration Is Required142.80 – 142.81
§ 142.80Review procedures.
§ 142.81Notice to the State.
Subpart J [Reserved]
Subpart KVariances for Small System142.301 – 142.313