As used in this chapter, unless the context otherwise requires:
(1) "Department" shall mean the state department of ecology;
(2) "Facility" or "facilities" shall mean any land, building, structure, machinery, system, fixture, appurtenance, equipment or any combination thereof, or any interest therein, and all real and personal properties deemed necessary in connection therewith whether or not now in existence, which is used or to be used by any person, corporation or municipality in furtherance of the purpose of abating, controlling or preventing pollution;
(3) "Governing body" shall mean the body or bodies in which the legislative powers of the municipality are vested;
(4) "Mortgage" shall mean a mortgage or a mortgage and deed of trust or other security device;
(5) "Municipality" shall mean any city, town, county, port district, or water-sewer district in the state; and
(6) "Pollution" shall mean any form of environmental pollution, including but not limited to water pollution, air pollution, land pollution, solid waste disposal, thermal pollution, radiation contamination, or noise pollution.