Title 42The Public Health and WelfareRelease 119-73

§300j–13 Source water quality assessment

Title 42 › Chapter CHAPTER 6A— - PUBLIC HEALTH SERVICE › Subchapter SUBCHAPTER XII— - SAFETY OF PUBLIC WATER SYSTEMS › Part Part E— - General Provisions › § 300j–13

Last updated Apr 6, 2026|Official source

Summary

Within 12 months after August 6, 1996, the Administrator must publish guidance, after public notice and comment, to help States that run public water programs set up source water assessment programs. A State must have an approved assessment program before it can adopt the special monitoring changes under section 300g–7(b). States must map the boundaries of the areas that feed each public water system using available hydrogeologic and related information. They must also, as much as practical, find where regulated contaminants (and any unregulated contaminants the State picks that might threaten health) come from so they can judge how vulnerable each water system is. States must send their assessment program to the Administrator within 18 months after the guidance is issued. If the Administrator does not disapprove it within 9 months after submission, it is treated as approved. Once approved, the State must start work right away and finish by a timetable that allows no more than 2 years after approval (the Administrator can add up to 18 more months and must consider available funds under section 300j–12). The Administrator must also, as soon as practical, run a demonstration project with other federal agencies for assessing and protecting source waters for big cities and on Federal lands. States may use existing studies and programs (like vulnerability studies, wellhead protection, pesticide plans, watershed work, and pollution control plans) to avoid duplication. States must make the assessment results available to the public.

Full Legal Text

Title 42, §300j–13

The Public Health and Welfare — Source: USLM XML via OLRC

(a)(1)Within 12 months after August 6, 1996, after notice and comment, the Administrator shall publish guidance for States exercising primary enforcement responsibility for public water systems to carry out directly or through delegation (for the protection and benefit of public water systems and for the support of monitoring flexibility) a source water assessment program within the State’s boundaries. Each State adopting modifications to monitoring requirements pursuant to section 300g–7(b) of this title shall, prior to adopting such modifications, have an approved source water assessment program under this section and shall carry out the program either directly or through delegation.
(2)A source water assessment program under this subsection shall—
(A)delineate the boundaries of the assessment areas in such State from which one or more public water systems in the State receive supplies of drinking water, using all reasonably available hydrogeologic information on the sources of the supply of drinking water in the State and the water flow, recharge, and discharge and any other reliable information as the State deems necessary to adequately determine such areas; and
(B)identify for contaminants regulated under this subchapter for which monitoring is required under this subchapter (or any unregulated contaminants selected by the State, in its discretion, which the State, for the purposes of this subsection, has determined may present a threat to public health), to the extent practical, the origins within each delineated area of such contaminants to determine the susceptibility of the public water systems in the delineated area to such contaminants.
(3)A State source water assessment program under this subsection shall be submitted to the Administrator within 18 months after the Administrator’s guidance is issued under this subsection and shall be deemed approved 9 months after the date of such submittal unless the Administrator disapproves the program as provided in section 300h–7(c) of this title. States shall begin implementation of the program immediately after its approval. The Administrator’s approval of a State program under this subsection shall include a timetable, established in consultation with the State, allowing not more than 2 years for completion after approval of the program. Public water systems seeking monitoring relief in addition to the interim relief provided under section 300g–7(a) of this title shall be eligible for monitoring relief, consistent with section 300g–7(b) of this title, upon completion of the assessment in the delineated source water assessment area or areas concerned.
(4)The timetable referred to in paragraph (3) shall take into consideration the availability to the State of funds under section 300j–12 of this title (relating to State loan funds) for assessments and other relevant factors. The Administrator may extend any timetable included in a State program approved under paragraph (3) to extend the period for completion by an additional 18 months.
(5)The Administrator shall, as soon as practicable, conduct a demonstration project, in consultation with other Federal agencies, to demonstrate the most effective and protective means of assessing and protecting source waters serving large metropolitan areas and located on Federal lands.
(6)To avoid duplication and to encourage efficiency, the program under this section may make use of any of the following:
(A)Vulnerability assessments, sanitary surveys, and monitoring programs.
(B)Delineations or assessments of ground water sources under a State wellhead protection program developed pursuant to this section.
(C)Delineations or assessments of surface or ground water sources under a State pesticide management plan developed pursuant to the Pesticide and Ground Water State Management Plan Regulation (subparts I and J of part 152 of title 40, Code of Federal Regulations), promulgated under section 136a(d) of title 7.
(D)Delineations or assessments of surface water sources under a State watershed initiative or to satisfy the watershed criterion for determining if filtration is required under the Surface Water Treatment Rule (section 141.70 of title 40, Code of Federal Regulations).
(E)Delineations or assessments of surface or ground water sources under programs or plans pursuant to the Federal Water Pollution Control Act [33 U.S.C. 1251 et seq.].
(7)The State shall make the results of the source water assessments conducted under this subsection available to the public.
(b)For provisions relating to program approval and disapproval, see section 300h–7(c) of this title.

Legislative History

Notes & Related Subsidiaries

Editorial Notes

References in Text

The Federal Water Pollution Control Act, referred to in subsec. (a)(6)(E), is act June 30, 1948, ch. 758, as amended generally by Pub. L. 92–500, § 2, Oct. 18, 1972, 86 Stat. 816, which is classified generally to chapter 26 (§ 1251 et seq.) of Title 33, Navigation and Navigable Waters. For complete classification of this Act to the Code, see

Short Title

note set out under section 1251 of Title 33 and Tables.

Reference

Citations & Metadata

Citation

42 U.S.C. § 300j–13

Title 42The Public Health and Welfare

Last Updated

Apr 6, 2026

Release point: 119-73