(A) The city shall make and enforce rules and regulations establishing the types and characteristics of sewage, industrial wastes, and other matter which shall not be discharged into the sanitary sewerage system, the types and characteristics of sewage and industrial wastes admissible to the system only after pretreatment, requisites for pretreatment, and otherwise governing the discharge of sewage, industrial wastes, and other matter into the system in the interest of safety and efficient operation of the wastewater treatment plant. Applicable industrial pretreatment conditions and industrial pretreatment regulations, as promulgated under § 307(b) of the Clean Water Act, being 33 U.S.C. § 1367, are hereby incorporated in this section and made a part thereof.
(B) An industry must, upon application for sewer service, present to the city a tabulation of the chemical analysis of the wastes to be discharged to the sewage system and the volume of such wastes, or if this is not available, the expected waste analysis based on similar processes now in operation.
(C) In cases where the character of sewage or industrial waste from any industrial plant, building, or premises is such that it will damage the sewage system or cannot be treated satisfactorily at the wastewater treatment plant, the city shall compel the users to dispose of the waste and prevent it from entering the sewerage system.
(D) In cases where the character of the sewage or industrial waste from any manufacturing or industrial plant, building, or premises is such that it imposes an unreasonable burden on the sewage collection, pumping, or treatment works greater than that imposed by the average sewage entering the sewerage system, the city may: compel the manufacturing or industrial plant, building, or premises to pretreat the sewage in a manner as specified by the city before discharging it into the sewerage system; require flow control or equalization of such wastes so as to avoid any slug loads or excessive loads that may be harmful to the treatment works; or require payment of a surcharge on any excessive flows or loadings discharged to the treatment works to cover the additional costs of having capacity for and treating such wastes. The city also has the right to contract or make a special agreement for treatment or disposal of wastes in order to ensure that the integrity of the treatment facilities and the receiving stream is preserved.
(E) (1) 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. In accordance with § 307(a) of the Clean Water Act, toxic or harmful substances include, but are not necessarily limited to the following.
Toxic Substances | Tolerable Limits |
Toxic Substances | Tolerable Limits |
Arsenic | 0.2 mg/l |
Barium | 1.0 mg/l |
Boron | 5.0 mg/l |
Cadmium | 0.1 mg/l |
Chromium+3 | 0.5 mg/l |
Chromium+6 | 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 |
Radioactive substances | Gross Beta activity (in the known absence of strontium and Alpha emitters) - 1,000 micro curies per liter |
Selenium | 0.1 mg/l |
Silver | 0.03 mg/l |
Sulfides | 50.0 mg/l |
Total dissolved solids | 1,500.0 mg/l |
Tungsten | 5.0 mg/l |
Zinc | 2.0 mg/l |
(2) 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 wastewater 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 of will not violate water quality standards.
(1982 Code, § 50.31) (Ord. 1974-26, passed 10-10-1974; Ord. 1989-12, passed 6-5-1989; Ord. 2004-20, passed 7-12-2004; Ord. 2013-2, passed 2-11-2013) Penalty, see § 50.999