(a) The discharge of nonacceptable industrial wastewater into the sewerage system, whether directly or indirectly, is prohibited. Wastewater shall be deemed nonacceptable when the concentration of harmful or toxic substances in the wastewater exceeds certain prescribed tolerable limits. Toxic or harmful substances include, but are not necessarily limited to, the following:
Toxic or Harmful Substance
Tolerable Limits
Arsenic
0.02 mg/l
Barium
1.0 mg/l
Boron
5.0 mg/l
Cadmium +3
0.1 mg/l
Chromium +6
0.5 mg/l
Chromium
0.5 mg/l
Cobalt
1.0 mg/l
Copper
0.5 mg/l
Cyanide (HCN)
0.5 mg/l
Fluoride
5.0 mg/l
Iron
5.0 mg/l
Lead
0.5 mg/l
Mercury
0.02 mg/l
Molybdenum
5.0 mg/l
Nickel
2.0 mg/l
Phenols
5.0 mg/l
Selenium
0.10 mg/l
Silver
0.03 mg/l
Sulfides
50.0 mg/l
Total Dissolved Solids
1,500 mg/l
Tungsten
5.0 mg/l
Zinc
2.0 mg/l
Radioactive Substances
Gross Beta activity (in the
known absence of strontium
and Alpha emitters)—1,000
micro curies per liter
The preceding list of toxic or harmful substances is subject to revisions as required to meet current water-quality standards or effluent standards imposed by state or federal agencies. In special cases (low volume users), the concentration of toxic or harmful substances in the waste water may be exceeded if it is determined by the City that the total pounds of toxic or harmful substances discharged to the sewage system are not harmful to or will not interfere with the sewage treatment process or will not violate water quality or effluent standards.
(b) No person shall discharge or cause to be discharged, either directly or indirectly to the sewerage system, any of the following described substances, materials, waters, or wastes:
(1) Any liquid or vapor having a temperature higher than 150.° F.
(2) Any gasoline, benzene, naphtha, fuel oil, mineral oil, or other volatile, flammable, or explosive liquid, solid, or gas.
(3) Any noxious or malodorous gas or substance, which, either singly or by interaction with other wastes, is capable of creating a public nuisance, hazard to life, or of preventing entry into the sewers for their maintenance and repair.
(4) Any waters or wastes having a pH lower than 5.5 or higher than 9.0; or having any other corrosive property; or causing damage or hazard to structures, equipment, or personnel of the sewerage system.
(5) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood paunch manure, hair and fleshing, entrails, lime slurry, lime, chemical or paint residues, cannery wastes, bulk solids, or any other solid objects or viscous substance capable of causing obstruction to the flow operation of the sewerage system.
(6) Any waters or wastes containing a toxic or poisonous substance 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 of the sewerage system.
(7) Any water or wastes containing emulsified oil or grease exceeding, on analysis, an average of 50 milligrams per liter of oil and grease, determined as total soluble matter.
(8) Any garbage that has not been properly shredded to a degree that all particles will be carried freely under the flow conditions of the sewer, and with no particle greater than 1/2 inch in any dimension.
(9) Any water or wastes containing suspended solids of such character or quality that unusual attention or expense is required to handle such materials at the sewage treatment plant, or having a chlorine demand greater than 25 parts per million.
The above list is subject to revisions as required to meet current water quality standards imposed by the state or federal agencies.
(Ord. 1983-32. Passed 11-22-83.)