Idaho Administrative Code
Title IDAPA 58 - Environmental Quality, Department of
Rule 58.01.08 - IDAHO RULES FOR PUBLIC DRINKING WATER SYSTEMS
Section 58.01.08.311 - ENHANCED TREATMENT FOR CRYPTOSPORIDIUM - LONG TERM 2 ENHANCED SURFACE WATER TREATMENT RULE

Universal Citation: ID Admin Code 58.01.08.311

Current through August 31, 2023

40 CFR Part 141 , subpart W is herein incorporated by reference. (3-24-22)

01. Cryptosporidium Treatment Credit for Approved Watershed Control Program. The Department shall award 0.5 (zero point five) logs cryptosporidium removal credit to systems that have a Department approved Watershed Control Program. Requirements for a watershed control program are set forth in 40 CFR 141, Subpart W. Guidance on how to develop a watershed control program and obtain Department approval is provided in "Implementation Guidance for the Long Term 2 Enhanced Surface Water Treatment Rule," as referenced in Section 002. (3-24-22)

02. Assessment of Significant Changes in the Watershed. As part of the sanitary survey process set forth in Section 302, the Department, or an agent approved by the Department, shall assess significant changes in the watershed of a surface water system that have occurred since the system conducted source water monitoring. If changes in the watershed have the potential to significantly increase contamination of the source water with cryptosporidium, the Department shall consult with the water system owner on follow-up actions that may be required under 40 CFR 141, Subpart W, including, but not limited to, source water monitoring and/or additional treatment requirements. "Implementation Guidance for the Long Term 2 Enhanced Surface Water Treatment Rule," as referenced in Section 002, provides a description of factors that will be considered by the Department when making an assessment of changes in the watershed. These factors include, but are not limited to the following: (3-24-22)

a. New NPDES permits or changes in existing NPDES permits that involve increased loading of contaminants. (3-24-22)

b. Changes in land use patterns. (3-24-22)

c. Changes in agricultural cropping, chemical application, or irrigation practices. (3-24-22)

d. Changes in other non-point discharge source activities (such as grazing, manure application, commercial or residential development). (3-24-22)

e. Stream or riverbed modifications. (3-24-22)

f. NPDES permit violations at wastewater treatment plants and confined animal feedlot operations. (3-24-22)

g. Dramatic natural events such as floods, forest fires, earthquakes, and landslides that may transport or expose contaminants. (3-24-22)

h. Prolonged drought conditions that may warrant special preparatory measures to minimize impacts from waste accumulations that are washed into source waters when precipitation returns. (3-24-22)

i. Status of the water system's emergency response plan. (3-24-22)

j. Accidental or illegal waste discharges and spills. (3-24-22)

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