No person shall discharge or cause to be discharged to any public sewer any of the following described substances, materials, waters or wastes:
(A) Any liquid or vapor having a temperature higher than 150°F (65°C);
(B) Any waters or wastes which contain grease, oil or some other substance that will solidify or become discernibly viscous at temperatures between 32°F to 150°F;
(C) Any waters or wastes containing emulsified oil or grease exceeding, on analysis, an average of 100 parts per million floatable and 600 parts per million dispersed of either soluble matter;
(D) Any gasoline, benzine, naphtha, fuel oil, mineral oil or other flammable or explosive liquid, solid or gas;
(E) Any waters or wastes that contain more than ten parts per million by weight of the following gases: hydrogen sulphide, sulphur dioxide or nitrous oxide;
(F) Any garbage that has not been properly comminuted or triturated;
(G) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, paunch manure, hair and fleshings, beer or distillery slops, chemical residues, paint residues, cannery waste, bulk solids or any other solid or viscous substance capable of causing obstruction to the flow in sewers or other interference with the proper operation of the sewage works;
(H) Any waters or wastes that contain phenols in excess of 0.50 parts per million by weight (500 parts per billion). These limits may be modified by the City of Evansville Water and Sewer Utility Board if, after a public hearing thereon, the Board finds that the aggregate of contributions throughout the area being serviced creates treatment difficulties or produces a plant effluent discharge to the receiving waters which may be prohibitive;
(I) Any waters or wastes acid or alkaline in reaction, and having corrosive properties capable of causing damage or hazard to structures, equipment or personnel of the sewage works. Free acids and alkalis of such wastes must be neutralized within a permissible range of pH, between four, five and ten;
(J) (1) Any waters or wastes containing a toxic or poisonous substance, or of high chloride demand, in sufficient quantity to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals or create any hazard in the receiving waters or stormwater overflows, such as copper, zinc, chromium and similar toxic substances, shall be limited to the following average quantities in the sewage as it arrives at the City of Evansville sewage treatment plant, and at no time shall the hourly concentration at the sewage treatment plant exceed three times the average concentration.
Substance | Quantity |
Substance | Quantity |
Cadmium | 0.002 parts per million |
Chlorine demand | 30 parts per million |
Chromium as Cr (hexavalent) | 5 parts per million |
Copper as Cu | 3 parts per million |
Lead | 0.1 parts per million |
Mercury | 0.002 parts per million |
Zinc as Zn | 2 parts per million |
(2) Contributions of grater volume or concentration from individual establishments shall be subject to control by the Town Council.
(K) Any cyanides in excess of two parts per million by weight as CN in the wastes from any outlet into the public sewers;
(L) Any waters or wastes containing the discharge of acid pickling wastes or concentrated plating solutions, whether neutralized or not, which are capable of causing any obstruction, damage or corrosion in the sewers or the sewage treatment plant;
(M) Any waters containing suspended solids of such character and quantity that unusual provision, attention or expense is required to handle the materials at the City of Evansville sewage treatment plant;
(N) Any noxious or malodorous gas or substance which, either singly or by interaction with other wastes, is capable of creating a public nuisance or hazard to life or of preventing entry into sewers for their maintenance and repair;
(O) Any radioactive wastes or isotopes having a half-life of more than 100 days or a concentration as may exceed limits established by the Superintendent in compliance with applicable state or federal regulations, without special permit, to be issued by the City of Evansville Water and Sewage Utility Board;
(P) Any wastes that, for a duration of 15 minutes, have a concentration greater than five times the average concentration of the wastes as measured by suspended solids and BOD;
(Q) Any waters or wastes containing iron-bearing compounds or substances in quantities sufficient to cause the average concentration in the sewage as it arrives at the City of Evansville sewage treatment plant to exceed 25 milligrams per litre total iron or five milligrams per liter soluble iron;
(R) Any waters or wastes which may result in a violation of any provision of the City of Evansville NPDES permits; or
(S) Any stormwater, surface water, groundwater, roof runoff, roof downspouts, exterior foundation drains, perimeter drains, areaway drains, floor drains or other sources of surface or sub-surface drainage, runoff or groundwater, and uncontaminated cooling water or unpolluted industrial process waters.
(Ord. 1987-4, passed 8-24-1987; Ord. 2004-1, passed 6-8-2004)