Okla. Admin. Code § 252:515-9-96

Current through Vol. 42, No. 8, January 2, 2025

Section 252:515-9-96 - Groundwater protection standard

(a)MCL established. The maximum contaminant level (MCL) promulgated under the Safe Drinking Water Act shall be the groundwater protection standard for each Appendix A and C constituent detected in the groundwater.

(b)MCL not established. If MCL has not been established under the Safe Drinking Water Act for a particular constituent, the background level of the constituent shall be the groundwater protection standard.

(c)Background above MCL. If background level of a particular constituent is above the established MCL, or appropriate health-based levels if no MCL has been established, the background level shall be the groundwater protection standard.

(1)Published health-based level. For the purposes of this Subsection, the health-based level is a concentration that would result in an increased risk of no greater than 1x 10 ^-5 for carcinogens or a Hazard Index of < 1 for non-carcinogens as calculated by procedures specified in the most recent health-based levels publication by the EPA.

(2)Health-based level not listed. The DEQ shall be consulted if a health-based level is not listed for a particular constituent.

Okla. Admin. Code § 252:515-9-96

Added at 20 Ok Reg 1151, eff 6-1-03

Amended by Oklahoma Register, Volume 39, Issue 24, September 1, 2022, eff. 9/15/2022