Section 2232 - Amount of rental or chargeAny such annual rental, rate or charge may be, but shall not be limited to, such sum as may be sufficient to meet any or all of the following classes of expense:
(a) the amount expended annually by the county, city, borough, incorporated town, or township in the operation, maintenance, repair, alteration, inspection, depreciation, or other expenses in relation to such sewer, sewerage system, or sewage treatment works; (b) such annual amount as may be necessary to provide for the amortization of any indebtedness incurred, or non-debt revenue bonds issued, by the county, city, borough, incorporated town, or township in the construction or acquisition of such sewer, sewerage system, or sewage treatment works, and interest thereon, in order that said improvements may become self-liquidating, or as may be sufficient to pay the amount agreed to be paid annually under the terms of any contract or lease with any authority or private corporation furnishing, or undertaking to design or construct facilities with which to furnish, sewer, sewerage or sewage treatment services to such county, city, borough, town, or township and its inhabitants; and(c) sufficient to establish a margin of safety of ten per centum. Any unused surplus from any preceding year shall be paid into the fund accruing from said rentals, rates or charges and, whenever the amount in said fund exceeds the said margin of safety of ten per centum, the excess shall be paid into the sinking fund. The amount required for sinking fund and interest shall be paid into the sinking fund, and the amount so paid, including any excess as above provided, shall not be used for any other purpose. The said annual rental or whatever rate or charge shall be decided upon by the county, city, borough, incorporated town, or township shall be apportioned equitably among the properties served by the said sewer, sewerage system, or sewage treatment works.1935, July 18, P.L. 1286, No. 402, § 2. Amended 1937, May 14, P.L. 630, § 1; 1949, April 18, P.L. 499, No. 112, § 1; 1970, June 22, P.L. 406, No. 133, § 2.