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 those pollutants subject to the Clean Water Act and defined in Section 307(a). Limits on toxic or harmful substances of this section are as shown below:
Toxic or Harmful Substance | Tolerable Limit |
Barium | 4.91 mg/L |
Cadmium | 0.04 mg/L |
Chromium (total) | 5.71 mg/L |
Chromium (trivalent) | 5.71 mg/L |
Copper | 0.81 mg/L |
Lead | 0.50 mg/L |
Mercury | 0.02 mg/L |
Molybdenum | 4.95 mg/L |
Nickel | 2.48 mg/L |
Strontium | Monitor Only |
Total Dissolved Solids | 3,047 mg/L |
Zinc | 1.24 mg/L |
(Ord. 59-2008. Passed 12-16-08.)
The preceding listing of allowable concentrations of toxic or harmful substances is subject to revisions as required to meet current water quality standards, effluent standards imposed by state or federal agencies, or the requirements of Section 307(a) of the Clean Water Act. 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 or will not violate water quality or effluent standards.
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:
(a) Any liquid or vapor having a temperature higher than 150 degrees F;
(b) Any gasoline, benzene, naphtha, fuel, oil, mineral oil, or other volatile flammable or explosive liquid, solid or gas.
(c) Any noxious or malodorous gas or substance which, either singly or by interaction with other wastes, is capable of creating a public nuisance or hazard to life or of preventing entry into the sewers for their maintenance and repair.
(d) Any waters or wastes having a pH lower than 5.5 or higher than 9.0, or having any other corrosive property of causing damage or hazard to structures, equipment, or personnel of the sewerage system.
(e) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, punch manure, hair and fleshings, entrails, lime slurry, lime, chemical, or paint residues, cannery wastes, bulk solids, or any other solid objects or viscous substance capable or causing obstruction to the flow operation of the sewerage system.
(f) Any waters or wastes containing a toxic or poisonous substance in sufficient quantity to injure or interfere with any sewerage treatment process, constitute a hazard to humans or animals, or create a hazard in the receiving waters of the sewerage system.
(g) Any water or wastes containing emulsified oil or grease exceeding, on analysis, an average of 50 milligrams of oil and grease per liter determined as total soluble matter.
(h) 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 ½ inch in any dimension.
(i) 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 milligrams per liter.
(j) Any waste containing substances that would result in a violation of the NPDES permit.
The above list is subject to revisions as required to meet current water quality standards imposed by the state or federal agencies.
No statement contained in this chapter shall limit the right of the City to reject wastes, require the pretreatment of wastes, levy surcharges for the treatment of wastes, or to contract for a special agreement or arrangement for the treatment and disposal of wastes unless such actions are contrary to State and/or Federal laws and/or regulations.
(Ord. 13-2001. Passed 2-20-01.)