(a) Prohibitions on Wastewater Discharges. No person shall discharge or cause or allow to be discharged into the public sewer, wastes designated as prohibited wastes pursuant to 40 CFR 128.131 and amendments thereto, including, but not limited to, the following:
(1) Explosive mixtures. Liquids, solids or gases which, by reason of their nature or quantity, are, or may be, sufficient to cause fire or explosion or be injurious in any other way to the sanitary sewage system or to the operation and maintenance of the system. At no time shall two successive readings on an explosion hazard meter, at the point of discharge into the sewer system, be more than five percent (5%) nor any single reading over ten percent (10%) of the Lower Explosive Limit (L.E.L.) of the meter. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides.
(2) Corrosive wastes. Waters or wastes having a pH lower than 6.0 or greater than 9.0 and having any other corrosive property capable of causing damage or hazard to structures, equipment and personnel of the wastewater disposal facilities. If City water exceeds pH 9.0, the upper limit shall be raised to the pH of City water.
(3) Solid or viscous wastes. Solid or viscous substances in quantities or of such size capable of causing obstruction to the flow in sewers or other interference with the operation of the wastewater disposal facilities, such as, but not limited to, ashes, bones, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups and milk containers, either whole or ground by garbage grinders and fats or grease from food preparation or fryers.
(4) Toxic wastes. Waters or wastes containing toxic or poisonous solids, liquids or gases in sufficient quantity, either singly or in combination with other wastes, to injure or interfere with any waste treatment process, render treatment process residues unfit for reclamation or reuse, cause violations of the treatment works NPDES discharge permit, constitute a hazard to humans or animals, create a public nuisance or create any hazard or water quality violation in the receiving waters of the public wastewater treatment works. Radioactive wastes and wastes containing matter designated as toxic pollutants by the U.S. EPA pursuant to Section 307(a) of the Federal Act and amendment thereto, or as hazardous substances pursuant to Section 311(b) of the Federal Act and amendments thereto, shall not be discharged to the public sewer without prior written approval of the Director. Current listings of the toxic pollutants and hazardous substances shall be available from the Director. (Ord. 87-8399. Passed 2-18-87.)
(b) Limitations on Wastewater Discharges.
(1) Except as provided herein, no person shall discharge or cause or allow to be discharged into the public sewer wastes, which exceed the following limitations. The Director may establish more stringent limitations as necessary to protect the public disposal facilities or the public health, safety and welfare; or to comply with other agencies having jurisdiction over discharge from the wastewater treatment works.
Pollutant Group A | Upper Limit |
(milligrams per liter) | |
BOD | 200 |
COD | 300 |
Filterable Residue | 750 |
Nonfilterable Residue | 200 |
Ammonia as N | 7.5 |
Total Phosphorus as P | 5 |
Pollutant Group B
Chlorinated Organic Compounds |
0.02 | |
Phenols |
1.0 | |
Surfactants (MBAS) |
1.0 | |
Metals (Local Limit in mg/l) | ||
Cadmium |
Cd |
9.75 |
Total Chromium |
Cr |
266.34 |
Copper |
Cu |
4.91 |
Lead |
Pb |
35.77 |
Nickel |
Ni |
119.57 |
Zinc |
Zn |
24.54 |
Silver |
Ag |
17.43 |
Molybdenum |
Mo |
45.62 |
Barium |
Ba |
115.26 |
Chromium (Hexavalent) |
Cr |
1.0 |
Mercury |
0.05
| |
(Ord. 04-048. Passed 6-23-04.)
(2) Upon proper application therefor, on such forms and in accordance with such regulations as the Director shall prescribe and the payment of the appropriate fees established in Section 933.28, the Director may issue wastewater discharge permits, which shall be valid for a period of time as the Director may allow but in any event not to exceed three years, subject to the provisions of Sections 933.08 to 933.12 herein, which permits shall allow the permit holder to exceed the upper limits, as defined above, for such Group A pollutants and in such amounts as the Director shall determine, provided, however, that no such permit shall be issued unless the Director first finds that such excess will not cause damage to, or exceed the capacity of the City's wastewater disposal facilities to meet the minimum standards of the Act or any other applicable law.
(3) No person shall discharge or cause to be discharged into the public sewer wastes which exceed the following limitations:
A. Wastewater having a temperature higher than 104 degrees Fahrenheit.
B. Wastewater containing more than 100 mg/l of fats, wax, grease or oils, whether emulsified or not, or containing substances which may solidify or become viscous at temperatures between thirty- two degrees Fahrenheit and 104 degrees Fahrenheit.
C. Any garbage which has not been properly shredded as defined herein. The installation of any garbage grinder equipped with a motor of three-fourths horsepower or greater shall require the prior written approval of the Director.
D. Solids, liquids or gases which are noxious or malodorous due to their nature, quantity or interaction with other wastes.
E. Quantities of flow, concentrations or both which constitute a slug as defined herein.
F. Wastes with objectionable color not removable by the treatment process.
G. Materials that, by themselves, or when mixed with other components in wastewater, create a noxious odor from the sewer system.
(c) Prohibitions on Discharge of Unpolluted Water. No person shall discharge or cause to be discharged to a sanitary sewer any unpolluted water which includes, but is not limited to, stormwater, groundwater, roof runoff, subsurface drainage or uncontaminated cooling water or industrial process waters. Any existing roof drain connections to sanitary sewers shall be connected into an available storm sewer and shall be disconnected above ground in the manner approved by the Director. The owner of all buildings situated within the City is required at his expense to disconnect all existing roof drain connections to sanitary sewers in accordance with the provisions of this chapter within ninety days after the date of official notice to do so.
(d) Regulation of Discharge of Unpolluted Water. Unpolluted water, including, but not limited to cooling water, process water or blow-down from cooling towers or evaporative coolers shall not be discharged through direct or indirect connection to a storm sewer unless a permit is issued by the Director. The Director may approve the discharge of such water only when no reasonable alternative method of disposal is available. If a permit is granted for the discharge of such water into a public sewer, the user shall pay the applicable charges and fees and shall meet such other conditions as required by the Director.
(e) Limitations on Point of Discharge. No person shall discharge any substances directly into a manhole or other opening in a public sewer other than through an approved building sewer.
(f) Holding Tank Waste. No person shall discharge any holding tank waste into a public sewer unless he has obtained written approval from the Director. Unless otherwise allowed by the Director, approval must be secured for each separate discharge.
(Ord. 87-8399. Passed 2-18-87.)