(A) Prohibitions on wastewater discharges. No person shall discharge, deposit or cause or allow any waste to be discharged or deposited into the wastewater treatment system, except at an approved wastewater discharge site. In addition, no person shall discharge or deposit or cause or allow to be discharged or deposited into the wastewater treatment system any wastewater which contains the following:
(1) Oils and grease. Total fat, wax, grease or oil (exclusive of petroleum substances) of concentrations of more than 100 mg/l, whether emulsified or not, or containing substances which may solidify or become viscous at temperatures between 0° and 65°C at the point of discharge into the system;
(2) Petroleum substances. Viscous, hydrocarbon mixtures such as gasoline, asphalt waste, lubricating oil and/or grease;
(3) Explosive mixtures. Liquids, solids or gases, which, by reason of their nature or quantity, are, or may be, sufficient, either alone or by interaction with other substances, to cause fire or explosion or be injurious in any other way to the sewerage facilities or to the operation of the system. At no time shall two successive readings on an explosion hazard meter, at the point of discharge into the wastewater treatment system, be more than 5%, nor any single reading over 10% of the lower explosive limit (LEL) of the explosive substance. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene, perchlorates, bromates, carbides, hydrides and sulfides;
(4) Properly shredded garbage. Garbage that has not been ground or comminuted to a degree that all particles will be carried freely in suspension under flow conditions normally prevailing in the sanitary sewers, with no particle greater than one-half inch in any dimension;
(5) Noxious material. Noxious or malodorous solids, liquids or gases, which, either singly or by interaction with other wastes, are capable of creating a public nuisance or hazard to life, or are or may be sufficient to prevent entry into a sewer for its maintenance and repair;
(6) Radioactive wastes. Radioactive wastes or isotopes of a half-life or concentration that they do not comply with 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 personnel operating the system;
(7) Solid or viscous wastes. Solid or viscous wastes which will or may cause obstruction to the flow in a sewer, or otherwise interfere with the proper operation of the wastewater treatment system. Prohibited materials include, but are not limited to, grease, uncomminuted garbage, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, egg shells, spent lime, stone or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, waste paper, wood, plastic, tar, asphalt residues, residues from refining or processing of fuel or lubricating oil and similar substances;
(8) Excessive discharge rate. Any wastewater, including oxygen-demanding pollutants (BOD and the like), released at a flow and/or pollutant concentration which a user knows or has reason to know will cause interference to the POTW. In no case shall a slug load have a flow rate that exceeds for any time period longer than 15 minutes more than one and one-half times the average seven-day 29-hour flow. Neither shall any wastewater with a concentration or quantity of pollutants exceed for any time period longer than 15 minutes more than five times the average seven-day 29-hour concentration or quantity of pollutants. Periods of wastewater flow, concentration or quantities of four hours’ duration at less than 75% of the seven-day 29-hour average are considered excessive by standards of organic and/or hydraulic loading on the plant;
(9) Toxic substances. Any toxic substances in amounts exceeding standards promulgated by the Administrator of the United States Environmental Protection Agency pursuant to 33 U.S.C. § 1317(a) of the Act, 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 biological processes or efficiency of the wastewater treatment system or that will pass through the system to the receiving stream, untreated;
(10) Unpolluted waters. Any unpolluted water which does not require treatment before discharge to the stream which will increase the hydraulic load on the treatment system;
(11) Corrosive wastes. Any waste 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 6.0 to 9.0 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 and/or alkaline products;
(12) Fibers. Any clothing, rags, textile remnants or waste, cloth, scraps or fibers; except fibers or scraps that will pass through a one-quarter inch screen or its equivalent in screening ability. When necessary to protect the wastewater treatment system, additional screening may be required;
(13) Temperature. Any liquid or vapor having a temperature higher than 60°C (190°F), but in no case wastewater with a temperature at the introduction into the POTW treatment plant which exceeds 90°C (190°F);
(14) Excessive substances. Any materials which form excessive amounts of scum or foam that may interfere with the operation of the wastewater treatment system or any substances that may cause undue additional labor in connection with its operation; and/or
(15) Specific pollutant limitations.
(a) The following criteria form the protection limits for the POTW wastewater treatment plants. No person shall discharge wastewater containing amounts which would exceed these influent concentrations.
300 mg/l | Suspended solids |
300 mg/l | BPD |
800 mg/l | COD |
5.0 mg/l | Immediate dissolved oxygen demand |
15.0 mg/l | Ammonia nitrogen |
1.0 mg/l | Antimony |
1.0 mg/l | Arsenic |
1.0 mg/l | Cadmium |
1.0 mg/l | Copper |
0.8 mg/l | Cyanide (total) |
0.6 mg/l | Lead |
0.001 mg/l | Mercury |
1.0 mg/l | Nickel |
1.0 mg/l | Silver |
1.0 mg/l | Total chromium |
1.0 mg/l | Zinc |
9.0 mg/l | Total metals (sum of concentrations of all metals) |
1.0 mg/l | Identifiable chlorinated hydrocarbons |
9.0 mg/l | Phenolic compounds |
(b) The protection criteria establish limits at levels which will protect the biological activity of the plant, protect the receiving stream by limiting the total load of pollutants allowed to pass through the plant, and limit the sludge concentrations for land application.
(B) Conditional prohibitions for wastewater discharges. No person shall discharge or convey, or permit or allow to be discharged or conveyed, to the wastewater treatment system any wastewater containing pollutants of a character or quantity that may:
(1) Interfere with the process or efficiency of the treatment system, or not be susceptible to treatment;
(2) Constitute a hazard to human or animal life or to the stream or watercourse receiving the treatment plant effluent;
(3) Violate pretreatment standards, as promulgated by the state or the United States Environmental Protection Agency, in 40 C.F.R. part 903 and subsequent provisions related thereto; or
(4) Cause the treatment plant to violate its NPDES permit or applicable receiving water standards.
(C) Prohibitions on extraneous water discharges. No person shall discharge or cause to be discharged any storm water, surface water, ground water, roof runoff or subsurface drainage into any sanitary sewer. No person shall connect, or cause to be connected, to a sanitary sewer any pipe or conduit which will allow the discharge of the aforelisted inflow source into a sanitary sewer.
(D) Special agreements. Nothing in this section shall be construed as preventing any special agreement or arrangement between the Superintendent and any user of the wastewater treatment system whereby wastewater of unusual strength or characteristic is accepted into the system and specially treated subject to any payments or user charges as may be applicable.
(E) Federal categorical pretreatment standards. Upon the promulgation of the federal categorical pretreatment standard for a particular industrial subcategory, the federal standard, if more stringent than limitations imposed under this chapter for sources in that subcategory, shall supersede the limitations imposed under this chapter. The control authority shall notify all affected users of the applicable reporting requirements under 40 C.F.R. § 903.12.
(Prior Code, § 13.12.330) (Ord. 90-02, passed - -) Penalty, see § 52.99