(A) In order that the Sewer Department rates and charges may be justly and equitably adjusted to the service rendered, the Sewer Department shall base its charges not solely on volume, but also on the strength and character of the sewage and wastes which it is required to treat and dispose of. The users are hereby required to measure and determine the strength and content of all sewage and wastes discharged, either directly or indirectly, into the city's sewage works in such manner and by such method as the city may deem practicable in the light of the conditions and attending circumstances of the case, in order to determine the proper charge.
(B) Charges shall be based on the strength of the sewage and liquid wastes as determined by analysis of samples taken as above stated or taken from time to time by the city. The strength and character of the sewage and wastes shall be based on the quantity of suspended solids and five-day biological oxygen demand, determined on samples of sewage and wastes, sampled and determined in accordance with the latest copy of "Standard Methods of Analysis for Water, Sewage and Industrial Wastes" as published by the American Public Health Association. A surcharge shall be imposed when the five-day biological oxygen demand exceeds 400 milligrams per liter or suspended solids exceeds 450 milligrams per liter. This surcharge shall be an amount equal to $0.15 per pound in excess of 400 milligrams per liter biological oxygen demand or 450 milligrams per liter suspended solids for users of the city's corporate boundaries or outside city's corporate boundaries. The surcharge shall be adjusted annually based upon the annual cost of waste water treatment per pound of suspended solids and five-day biological oxygen demand for the previous year.
('71 Code, § 52.06) (Ord. 36-85, passed 5-29-85; Am. Ord. 18-94, passed 6-14-94; Am. Ord. 1-2002, passed 3-25-02; Am. Ord. 21-2011, passed 11-28-11)