part_subject: "NATIONAL PRIMARY DRINKING WATER REGULATIONS"
subpart_code: "T"
subpart_subject: "Enhanced Filtration and Disinfection—Systems Serving Fewer Than 10,000 People"
section_number: "141.560"
section_subject: "Is my system subject to individual filter turbidity requirements?"
cfr_reference: "40 CFR 141.560"
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"
---
If your system is a subpart H system serving fewer than 10,000 people and utilizing conventional filtration or direct filtration, you must conduct continuous monitoring of turbidity for each individual filter at your system. The following requirements apply to continuous turbidity monitoring:
(a)Monitoring must be conducted using an approved method in § 141.74(a);
(b)Calibration of turbidimeters must be conducted using procedures specified by the manufacturer;
(c)Results of turbidity monitoring must be recorded at least every 15 minutes;
(d)Monthly reporting must be completed according to § 141.570; and
(e)Records must be maintained according to § 141.571.