Idaho Admin. Code r. 02.03.01.150 - GROUND WATER QUALITY REFERENCE POINTS

01. Reference Points. The Director will use reference points for pesticides in ground water, based on the following order of availability:

a. Idaho rules of DEQ, IDAPA 58.01.11, "Ground Water Quality," Subsection 200.01.a. specific to pesticide primary constituent standards which were adopted from EPA MCLs; or

b. EPA Health Advisory Levels (HALs) identified in the 2006 Edition of the EPA Drinking Water Standards and Health Advisories, EPA 822-R-06-013; or

c. EPA Reference Dose (RfD) identified in the 2006 Edition of the EPA Drinking Water Standards and Health Advisories, EPA 822-R-06-013; or

d. A reference point based on:

i. Best scientific information currently available on adverse effects of the contaminant(s); and

ii. Protection of a beneficial use(s); and

iii. Practical quantitation levels for the pesticides, if they exceed the levels identified in IDAPA 58.01.11, "Ground Water Quality Rule," Subsection 200.01.a.

02. HAL and RfD Guide. The Director shall use the EPA's HAL and RfD number associated with the effects on a person weighing seventy (70) kilograms and drinking two (2) liters of water per day over a lifetime.

Notes

Idaho Admin. Code r. 02.03.01.150

Effective March 31, 2022