Whenever used in this act, the following words shall have the following respective meanings unless different meanings clearly appear from the context:

(a) “Governing body” or “board” means the board of county commissioners of the county in which the sewer district is located;

(b) “sewer district” means any wastewater, main, lateral, joint or submain storm or sanitary sewer district;

(c) “improvement” means any trunk lines, outfall or intercepting sewers, manholes, pumps, pumping stations, lift stations, disposal plants and any appurtenances and apparatus necessary for the collection, storage, treatment and disposal of storm or sanitary sewage and wastewater;

(d) “improve” means constructing, reconstructing, enlarging or extending any improvement;

(e) “sewage system” means any property owned by the sewer district or any property in which the sewer district has a property interest and any trunk lines, outfall or intercepting sewers, manholes, pumps, pumping stations, lift stations, disposal plants and any appurtenances and apparatus necessary for the collection, storage, treatment and disposal of storm or sanitary sewage and wastewater.

(f) “federal law” and “federal pollution control laws” means the clean water act, 33 U.S.C. § 1251 et seq., and amendments thereto, also known as the federal water pollution control act, and all administrative regulations adopted pursuant thereto;

(g) “industrial user” means any user of the sewage system identified as an “industrial user” under the criteria established by the United States environmental protection agency in 40 C.F.R. § 35.905, and amendments thereto;

(h) “person” means any individual, firm, corporation, partnership, organization or other entity and departments of government of the state or of the United States and political subdivisions thereof;

(i) “user” means the owner of the land or the person in control of the premises that discharges or contributes any wastes, storm or wastewater to the sewage system.