Many Residents of Snohomish County have private Wells on their property.
The District's Cross Connection Program requires a RPBA (Reduced-pressure Principle Backflow Assembly) be installed behind the meter for premise isolation.
The Department of Ecology and the State of Washington have requirements and standards to decommission your well.
Department of Ecology's information on Abandoned wells.
The State of Washington WAC 173-160-381 Standards on Decommissioning your well.
Department of Heath brochure (PDF) on wells.
Department of Ecology's Well Information