“BOD” (denoting biochemical oxygen demand) means the quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedure in five days at 20 degrees Celsius, expressed in parts per million by weight.

“Building drain” means that part of the lowest horizontal piping of a drainage system which receives the discharge from soil, waste, and other drainage pipes inside the walls of the building and conveys it to the building sewer, beginning five feet outside the inner face of the building wall.

“Building sewer” means the extension from the building drain to the public sewer or other place of disposal.

“Contributor” means any person responsible for the production of domestic, commercial or industrial waste which is directly or indirectly discharged into the public sewer system.

“Garbage” means solid wastes from the preparation, cooking and dispensing of food, and from the handling, storage and sale of produce.

“Industrial wastes” means the liquid wastes from industrial processes, trades or businesses as distinguished from sanitary sewage.

“Natural outlet” means any outlet into a watercourse, pond, ditch, lake or other body of surface or groundwater.

“pH” means the logarithm of the reciprocal of the weight of hydrogen ions in grams per liter of solution. It is used to indicate the concentration of free acid and alkali.

“Private sewer” means a sewer privately owned and not directly controlled by a public authority.

“Properly shredded garbage” means garbage that has been shredded to such degree that all particles will be carried freely under the flow conditions normally prevailing in public sewers, with no particle greater than one-half-inch to any dimension.

“Public sewer” means a common sewer which is directly controlled by a public authority.

“Sanitary sewage” means sewage discharging from the sanitary conveniences of dwellings (including apartment houses and hotels), office buildings, factories or institutions, and free from storm, surface water and industrial wastes.

“Sanitary sewer” means a sewer which carries sewage and to which storm, surface and groundwaters are not intentionally admitted.

“Sewage” means a combination of the water carried wastes from residences, business buildings, institutions, and industrial establishments, together with such ground, surface and stormwaters as may be present.

“Sewage treatment plant” means any arrangement of devices and structures used for treating sewage.

“Sewer” means a pipe or conduit for carrying sewage and other waste liquids.

“Sewer rental” means any and all rates, charges, fees, or rentals levied against and payable by contributors, as consideration for the servicing of said contributors by said sewer system.

“Sewer system, sewage works” means all facilities for collecting, pumping, treating and disposing of sewage.

“Slug” means any discharge of water, sewage, or industrial waste which in concentration of any given constituent or in quantity of flow exceeds for any period of duration longer than 15 minutes more than five times the average 24-hour concentration or flows during normal operation.

“Superintendent” means the superintendent of the city sewer system or his duly authorized assistant, agent or representative.

“Suspended solids” means solids that either float on the surface of or are in suspension in water, sewage, or other liquids and which are removable by laboratory filtering.

“Watercourse” means a channel in which a flow of water occurs, either continuously or intermittently. [Code 1975 § 3-3.0101.]