All water introduced into a well for drilling purposes and for mixing sealing materials shall be obtained from a potable water source and have a chlorine residual of not more than 1 ppm free chlorine.
[Statutory Authority: Chapter 18.104 RCW and RCW 43.21A.080. 98-08-032 (Order 97-08), ยง 173-160-341, filed 3/23/98, effective 4/23/98.]