Idaho Administrative Code
Title IDAPA 58 - Environmental Quality, Department of
Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS
Section 58.01.08.323 - GROUND WATER RULE

Universal Citation: ID Admin Code 58.01.08.323

Current through August 31, 2023

40 CFR 141, Subpart S is herein incorporated by reference. "Implementation Guidance for the Ground Water Rule," as referenced in Section 002, provides assistance to public water system owners and operators in understanding and achieving compliance with the requirements of 40 CFR 141, Subpart S. (3-24-22)

01. Discontinuation of Treatment. Systems that wish to discontinue four (4)-log virus treatment at a ground water source must meet the following criteria. Ground water sources on which treatment has been discontinued shall be subject to the triggered source water monitoring requirements of 40 CFR 141, Subpart S. (3-24-22)

a. Demonstration that any known source of contamination has been removed. (3-24-22)

b. Demonstration that structural deficiencies of the well have been rehabilitated and no longer exist. (3-24-22)

c. Provide evidence that the well is drawing from a protected or confined aquifer. (3-24-22)

d. Submit results of one (1) year of monthly monitoring for a fecal indicator organism during which no positive results occurred. (3-24-22)

02. Chlorine Purging Prior to Triggered Source Sampling. 40 CFR 141.402(e) requires that ground water source samples be collected at a location prior to any treatment. Pursuant to this requirement, systems that add chlorine to a source, either in the well bore or near enough to the wellhead that chlorinated water could backflow into the well, shall ensure that all chlorine residual has been purged prior to taking a triggered source water sample. This shall be accomplished by measuring chlorine residual in the source water until a reading of zero is obtained and be recorded in the space provided for chlorine residual on the sample submittal form. (3-24-22)

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