RCW 70.54.010: Polluting water supply—Penalty.

Every person who shall deposit or suffer to be deposited in any spring, well, stream, river or lake, the water of which is or may be used for drinking purposes, or on any property owned, leased or otherwise controlled by any municipal corporation, corporation or person as a watershed or drainage basin for a public or private water system, any matter or thing whatever, dangerous or deleterious to health, or any matter or thing which may or could pollute the waters of such spring, well, stream, river, lake or water system, shall be guilty of a gross misdemeanor.