(A) Generally. The following described substances, materials, waters or wastes shall be limited to discharges to municipal systems to concentrations or quantities which will not harm either the sewers, wastewater treatment process or equipment, will not have an adverse effect on the receiving stream, or will not otherwise endanger lives, limb, public property or constitute a nuisance. The Director may set additional limitations or limitations more stringent than those established in the regulations below if in his or her opinion such more severe limitations are necessary to meet the above objectives. In forming his or her opinion as to the acceptability, the Director shall give consideration to such factors as the quantity of subject waste in relation to flows and velocities in the sewers, materials or construction of the sewers, the wastewater treatment process employed, capacity of the wastewater treatment plant, and other pertinent factors. The limitations or restrictions on materials or characteristics of wastes or wastewaters discharged to the sanitary sewer shall not be violated without written approval of the Director.
(B) Restricted discharges. No user shall contribute, or cause to be contributed, directly or indirectly, any pollutant or wastewater which will interfere with the operation or performance of the POTW. These general prohibitions apply to all such users of a POTW whether or not the user is subject to national categorical pretreatment standards or any other national, state or local pretreatment standard or requirement. A user shall not contribute the following substances to any POTW:
(1) Pollutants which create a fire or explosion hazard in the POTW, including, but not limited to, wastestreams with a closed cup flashpoint or less than 140ºF or 60ºC using the test methods specified in 40 C.F.R. § 261.21;
(2) Pollutants which will cause corrosive structural damage to the POTW, but in no case discharges with pH lower than 5.5 or higher than 9.0 unless the works is specifically designed to accommodate such discharges;
(3) Any pollutant, including oxygen demanding pollutants (BOD and the like) released in a discharge at a flow rate and/or pollutant concentration which will cause interference with the POTW;
(4) Solid or viscous pollutants in amounts which will cause obstruction to the flow in the POTW resulting in interference;
(5) Heat amounts which will inhibit biological activity in the POTW resulting in interference, but in no case heat in such quantities that the temperature at the POTW treatment plant exceeds 104ºF (40ºC) unless the state, upon request of the POTW, approves alternate temperature limits;
(6) Any substance which may cause the POTW’s effluent or any other product of the POTW such as residues, sludges or scum, to be unsuitable for reclamation and reuse or to interfere with the reclamation process where the POTW is pursuing a reuse and reclamation program. In no case shall a substance discharged to the POTW cause the POTW to be noncompliant with sludge use or disposal criteria, guidelines or regulations developed under § 405 of the Act; any criteria, guidelines or regulations affecting sludge use or disposal developed pursuant to the Solid Waste Disposal Act, the Clean Act, the Toxic Substances Control Act or state criteria applicable to the sludge management method being used;
(7) Any substance which will cause the POTW to violate its NPDES/KPDES and/or sludge disposal system permit or the receiving water quality standards;
(8) Pollutants which result in the presence of toxic gases, vapors or fumes within the POTW in a quantity that may cause acute worker health and safety problems;
(9) Any trucked or hauled pollutants, except at discharge points designated by the Director;
(10) Wastewater containing more than 25 milligrams per liter of petroleum oil, nonbiodegradable cutting oils or products of mineral oil origin;
(11) Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants, to injure or interfere with any wastewater treatment process, to constitute a hazard to humans or animals, to create a toxic effect in the receiving waters of the POTW, or to exceed the limitation set forth in a categorical pretreatment standard. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to § 307(a) of the Act;
(12) Wastewater from industrial plants or commercial businesses containing floatable oils, fat or grease, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperature 32° to 150ºF (0° to 65ºC);
(13) Any wastewater with objectionable color not removable in the POTW, but in no case, wastewater with a color at the introduction into the POTW that exceeds 300 ADMI units;
(14) Any garbage that has not been properly shredded. Garbage grinders may be connected to sanitary sewers from homes, motels, institutions, restaurants, hospitals, catering establishments or similar places where garbage originates from the preparation of food in kitchens for the purposes of consumption on the premises or when served by caterers (pursuant to this chapter). The installation and operation of any garbage grinder equipped with a three-fourths HP motor or greater shall be subject to review and approval;
(15) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the city;
(16) Any radioactive wastes or isotypes of such half-life or concentration as may exceed limits established by the city in compliance with applicable state or federal regulations;
(17) Any waste(s) or wastewater(s) classified as a hazardous waste by the Resource Conservation and Recovery Act (RCRA) without a 60-day prior notification of such discharge to the Utility Commission. This notification must include the name of the hazardous waste, the EPA hazardous waste number, type of discharge, volume of discharge and time of occurrence(s). The Director may prohibit or condition the discharge(s) at any time;
(18) Any water or wastes which, by interaction with other water or wastes in the public sewer system, release obnoxious gases, from suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes;
(19) Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed or are amenable to treatment only to such degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters;
(20) Waters or wastes which have characteristics based on a 24-hour composite sample, or a shorter period composite sample if more representative which exceed the following normal maximum domestic wastewater parameter concentrations:
Parameter | Maximum Allowable Concentration Without Surcharge (mg/l) |
BOD | 300 |
TSS | 300 |
NH3-N | 30 |
(21) In addition to the requirements stated above, the following limitations are established for characteristics of any wastewaters to be discharged into the municipal sewer system.
Parameter | Max. Daily Concentration (mg/l) |
Parameter | Max. Daily Concentration (mg/l) |
Arsenic, total | 0.02 |
Barium, total | 6 |
Beryllium, total | 0.5 |
Boron, total | 1 |
Cadium, total | 0.1 |
Chloride, total | 250 |
Chromium, hexayalent | 0.05 |
Chromium, total | 0.5 |
COD | 750 |
Color | 300 ADMI units* |
Copper, total | 1 |
Cyanide, amenable | 0.01 |
Dissolved solids | 1,500 |
Flouide | 2 |
Iron, total | 3 |
Lead, total | 0.2 |
Magnesium, total | 14 |
Manganese, total | 0.2 |
Mercury, total | 0.002 |
Nickle, total | 0.2 |
PCB | 0 |
Phenols | 1 |
Selenium, total | 0.02 |
Silver, total | 0.04 |
Sulfate, total | 250 |
Sulfide | 5 |
Zinc, total | 1 |
* American Dye Manufacturers Institute (ADMI) | |
(Ord. 4-93, passed 4-5-1993; Ord. 4-2000, passed 6-5-2000; Ord. 21-2004, passed 12-20-2004)