Every gas company, electrical company, wastewater company, or water company, engaged in the sale and distribution of gas, electricity or water or the provision of wastewater company services, shall, upon reasonable notice, furnish to all persons and corporations who may apply therefor and be reasonably entitled thereto, suitable facilities for furnishing and furnish all available gas, electricity, wastewater company services, and water as demanded, except that a water company may not furnish water contrary to the provisions of water system plans approved under chapter
43.20 or
70A.100 RCW and wastewater companies may not provide services contrary to the approved general sewer plan.