Groundwater shall be exempt from the groundwater quality criteria of Env-Wq 402.04(a) and (b) if:

1. (a) The groundwater is within a groundwater discharge zone that has been permitted in accordance with Env-Wq 402.23;
2. (b) The groundwater is within a groundwater management zone that has been permitted in accordance with Env-Or 607; or

3. (c) The only source of the groundwater contamination is:

   1. (1) Salt and other de-icing chemicals applied for winter road maintenance, provided an active source of drinking water is not made unsuitable for use as drinking water without treatment; or

   2. (2) Residual 1,4-dioxane, perfluorohexane sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), perfluorooctane sulfonic acid (PFOS), or perfluorooctanoic acid (PFOA), or any combination thereof, from any facility that discharges treated wastewater to groundwater, provided:

      1. a. The requirements of Env-Wq 402.251 are met; and
      2. b. An active source of drinking water is not made unsuitable for use as drinking water without treatment.

Source. (See Revision Note at part heading for Env-Wq 402) #8955, eff 7-26-07; ss by #11036, eff 3-1-16; ss by #12553, eff 9-1-18 amd by #12836, eff 9-30-19