(A) Prohibitions on discharge. Wastewater which contains any of the following shall not be discharged into a public sewer:
(1) Explosive mixtures. Prohibited materials include gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides, sulfides, or other flammable or explosive liquid, solid, or gas with a closed cup flashpoint of less than 140°F or 60°C using the test methods specified in 40 C.F.R. § 261.21;
(2) Noxious materials. Noxious solids, liquids, or gases, which, either singly or by interaction with other wastes, are capable of creating a hazard to life, or prevent entry into a public sewer for its maintenance and repair;
(3) Improperly shredded garbage. Garbage that has been ground or comminuted to such a degree that all particles will be carried freely in suspension under flow conditions normally prevailing in the public sewers;
(4) Radioactive wastes. Radioactive wastes or isotopes that violate regulations or orders issued by the appropriate authority having control over their use and which will or may cause damage or hazards to the wastewater treatment system or to personnel operating the system;
(5) Solid or viscous wastes. Solid or viscous wastes which will or may cause obstruction to the flow in a public sewer resulting in interference. Prohibited materials include, but are not limited to, uncomminuted garbage, animal guts or tissues, paunch manure, earth, bones, feathers, ashes, cinders, sand, spent lime, cement, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, wastepaper, wood, plastic, tar, asphalt residues, residues from refining or processing of fuel or lubricating oil, and similar substances;
(6) Excessive discharge rate. Wastewaters at a flow rate or containing such concentrations or quantities of pollutants, including oxygen demanding pollutants, (e.g., BOD), that exceed for any time period longer than 15 minutes more than five times the average 24-hour concentration, or quantities of flow and/or pollutant concentration during normal operation that would cause a treatment process upset and subsequent loss of treatment efficiency;
(7) Toxic substances. Toxic substances in amounts exceeding standards promulgated by the Administrator of the U.S. Environmental Protection Agency pursuant to Section 307(a) of the Act, or as established by the city; and chemical elements or compounds, phenols or other taste or odor-producing substances, or any other substances which are not susceptible to treatment or which may interfere with the treatment processes or efficiency of the treatment system, and therefore will be unsuitable for reclamation and reuse;
(8) Unpolluted waters. Any unpolluted water including, but not limited to, water from cooling systems or of storm water origin, which will increase the hydraulic load on the wastewater treatment system;
(9) Corrosive wastes. Any wastes which will cause corrosion or deterioration of the treatment system. All wastes discharged to the public sewer system must have a pH value in the range of six to ten standard units. Prohibited materials include, but are not limited to, acids, sulfides, concentrated chloride and fluoride compounds, and substances which will react with water to form acidic products;
(10) Temperature. Any waste having a temperature higher than 104°F (40°C);
(11) Oil and grease. Any waste containing more than 300 mg/l of oil and grease;
(12) Limitations on point of discharge. No user shall discharge any substances directly into a manhole or other opening in a public sewer other than through an approved building sewer, or specifically designated outside discharge point, unless the owner has been issued a permit by the Director of Public Works;
(13) Cannery wastes. Any fruit or vegetable processing wastes or any other processing plant wastes which are retained on a screen having 20 meshes per square inch; or
(14) Trucked or hauled pollutants. Any trucked or hauled pollutants, except at discharge points designated by the POTW.
(B) Limitations on discharge.
(1) Allowable limits of BOD and TSS to be discharged to the public sewer shall be determined by the Director. Limits will be based upon wastewater treatment plant design capacity and volume of flow from the discharger. No user shall discharge wastewater containing excessive amounts of BOD or TSS (based on 24-hour composite sample) without a valid wastewater discharge permit.
(2) Except where expressly authorized to do so by pretreatment standards or requirements, no IU shall ever increase the use of process water, or in any other way attempt to dilute a discharge for the purpose of reducing pollutant concentration levels, as a partial or complete substitute for adequate treatment to achieve compliance with pretreatment requirements.
(C) Incompatible pollutants. To protect the wastewater treatment system, to prevent the discharge of pollutants which would pass through the wastewater treatment system without sufficient treatment, to prevent contamination of recovered by-products produced by the wastewater treatment system, and so as not to cause the city to violate applicable state and federal regulations and requirements, all users discharging into a public sewer shall be required to remove incompatible pollutants which cause pass through or interference from their waste.
(1) Any user requesting a permit to discharge to the sewer system shall conduct a sampling and laboratory analyses program to the satisfaction of the city to establish the quantities and concentrations of incompatible pollutants. At the option of the city, the analyses may include, but not be limited to, measurement of arsenic, barium, cadmium, calcium, chemical oxygen demand, copper, cyanide, fluoride, iron, lead, magnesium, mercury, methyl blue active substances, nickel, nitrogen, potassium, radioactivity, silver, sodium, total chromium, total filterable residue, toxicity, zinc, chlorinated hydrocarbons, and phenolic compounds.
(2) The city will evaluate the probable impact of the discharge on the operation of the wastewater treatment system, the ability of the system to meet its effluent limitations, and the impact on recoverable by-products. The city may then establish specific limitations on any incompatible pollutants as the city determines necessary.
(3) However, in no case shall a user discharge wastewater containing an excess of:
Metal | Allowable, mg/l |
Metal | Allowable, mg/l |
Aluminum | 5 |
Arsenic | 5 |
Barium | 10 |
Boron | 15 |
Cadmium | 0.1 |
Chromium | 5 |
Copper | 5 |
Cyanide | 1 |
Lead | 5 |
Mercury | 0.2 |
Nickel | 5 |
Selenium | 1 |
Silver | 5 |
Zinc | 5 |
(4) Notwithstanding the above requirements, all users discharging into publicly owned treatment works are required to remove incompatible pollutants from their waste in conformance with national pretreatment standards as issued by the U.S. Environmental Protection Agency.
(D) State requirements. State requirements and limitations on discharges shall apply in any case where they are more stringent than federal requirements and limitations or those in these regulations.
(E) Federal Categorical Pretreatment Standards. Upon the promulgation of the Federal Categorical Pretreatment Standards for a particular industrial subcategory, the federal standard shall supersede the limitations imposed in these regulations if the federal standard is more stringent than limitations imposed under these regulations. The National Categorical Pretreatment Standards, located in 40 C.F.R. Ch. I, subch. N, pts. 405 - 471, are hereby incorporated into these regulations. The Director shall notify all affected users of the applicable reporting requirements under 40 C.F.R. § 403.12.
(F) Discharge reports. The Director may require that any person discharging wastewater into a city sewer file a periodic discharge report. The discharge report may include, but need not be limited to, nature of process, volume, rates of flow, mass emission rate, production quantities, hours of operation, number and classification of employees, or other information which relates to the generation of waste including wastewater constituents and characteristics in the wastewater discharge. Such reports may also include the chemical constituents and quantity of liquid or gaseous materials stored on site even though they may not normally be discharged. In addition to discharge reports, the city may require information in the form of wastewater discharge permit applications and self-monitoring reports.
(G) Negligence through equipment or waste – right to discontinue service. The city may refuse to furnish sewer service and may discontinue all services to any premises where apparatus, appliances, or equipment using water is found by the Director to be dangerous or unsafe or where the use of water on such premises is found by the Director to be detrimental or injurious to the sewer service furnished by the city to other premises, or where the Director finds that negligent or wasteful use of water exists on any premises which affects the city's sewer service.
(Ord. 895 C.S., passed 3-21-12)