Hawaii Administrative Rules
Title 11 - DEPARTMENT OF HEALTH
Subtitle 1 - GENERAL DEPARTMENTAL PROVISIONS
Chapter 20 - RULES RELATING TO PUBLIC WATER SYSTEMS
Section 11-20-10 - Turbidity sampling and analytical requirements
Current through February, 2024
(a) Samples shall be taken by suppliers of water for public water systems using surface water sources in whole or in part. Turbidity measurements shall be made by the Nephelometric Method 2130B cited in the 18th edition of Standard Methods for the Examination of Water and Wastewater, 1992, or by the methods cited in 40 C.F.R. § 141.74(a)(1).
(b) The requirements in this subsection apply to filtered surface water systems until June 29, 1993. The requirements in this subsection apply to unfiltered systems until June 29, 1993, or until filtration is installed, whichever is later. The director shall determine, in writing pursuant to 42 U.S.C. § 300g-1(b)(7)(C)(iii), which systems must install filtration.
(c) After June 29, 1993, samples shall be collected at the filtration plant effluent or immediately prior to entry into the distribution system. Sampling of the plant effluent is acceptable if there are no storage tanks between the sampling point and entry into the distribution system. Continuous monitoring with a turbidimeter and recording chart, or collection of grab samples every four hours is required for conventional treatment, direct, and diatomaceous earth filtration.