PDFWAC 344-12-080
Sealing off strata.
(1) All underground sources of drinking water of present or potential future use for domestic, municipal, commercial, stock, or agricultural purposes shall be confined to their respective strata and shall be adequately protected.
(2) All oil, gas, and underground sources of drinking water above and below the producing horizon shall be sealed or separated in order to prevent their contents from passing into another stratum.