CHAPTER 97 – Use of Public Sewers



97.01 Storm Water 97.07 Control Manholes
97.02 Surface Waters Exception 97.08 Waste Sampling
97.03 Prohibited Discharges 97.09 Pretreatment
97.04 Restricted Discharges 97.10 Analyses
97.05 Restricted Discharges – Powers 97.11 Submission of Information
97.06 Submission of Basic Data 97.12 Special Arrangements

97.01    STORM WATER. No person shall discharge or cause to be discharged any unpolluted waters such as storm water, surface water, groundwater, roof run-off, sub-surface drainage, uncontaminated cooling water, or unpolluted industrial process waters to any sanitary sewer. Storm water and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers or storm sewers, or to a natural outlet approved by the Superintendent. Unpolluted industrial cooling water or unpolluted process waters may be discharged on approval of the Superintendent, to a storm sewer, combined sewer, or natural outlet.

97.02    SURFACE WATERS EXCEPTION. Special permits for discharging surface waters to a public sanitary sewer may be issued by the Council upon recommendation of the Superintendent where such discharge is deemed necessary or advisable for purposes of flushing, but any permit so issued shall be subject to revocation at any time when deemed to the best interests of the sewer system.

97.03    PROHIBITED DISCHARGES. No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:

1. Flammable or Explosive Material. Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid, or gas.

2. Toxic or Poisonous Materials. Any waters or wastes containing toxic or poisonous solids, liquids or gases in sufficient quantity, either singly or by interaction with other wastes, to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the receiving waters of the wastewater treatment facility.

3. Corrosive Wastes. Any waters or wastes having a pH lower than 5.0 or in excess of 9.0 or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the sewage system.

4. Solid or Viscous Substances. Solid or viscous substances in quantities or of such size capable of causing obstruction to the flow in sewers, or other interference with the proper operation of the sewage works such as, but not limited to, ashes, 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, milk containers, etc., either whole or ground by garbage grinders.

5. Permit Violation. Any discharge into the sanitary sewers that would cause a violation of the City’s NPDES permit and any modifications thereof.

97.04    RESTRICTED DISCHARGES. The following described substances, materials, waters, or wastes shall be limited in discharges to sanitary sewer systems to concentrations or quantities which will not harm either the sanitary sewers, wastewater treatment process or equipment; will not have an adverse effect on the receiving stream; or will not otherwise endanger life, limb, public property, or constitute a nuisance. The Superintendent may set limitations more stringent than those established below if such more stringent limitations are necessary to meet the above objectives. The Superintendent will give consideration to the quantity of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, the wastewater treatment facility and other pertinent factors. Wastes or wastewaters restricted are:

  1. High Temperature. Wastewater having a temperature higher than one hundred fifty (150) degrees F (65 degrees C).

  2. Oil. Wastewater containing more than 25 mg/l of petroleum oil, non-biodegradable cutting oils or products of mineral oil origin.

  3. Fat or Grease. Wastewater from industrial plants containing floatable oils, fat or grease.

  4. Unground Garbage. Any unground garbage. Garbage grinders may be connected to sanitary sewers from homes, hotels, institutions, restaurants, hospitals, catering establishments or similar places where garbage originates from the preparation of food in kitchens for the purpose of consumption on the premises or when served by caterers.

  5. Toxic Wastes. Any waters or wastes containing iron, chromium, copper, zinc, and other toxic and nonconventional pollutants to such degree that the concentration exceeds levels specified by Federal, State and local authorities.

  6. Odor or Taste. Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Superintendent or limits established by any Federal or State statute, rule or regulation.

  7. Radioactive Wastes. Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Superintendent in compliance with applicable State or Federal regulations.

  8. Unusual Wastes. Materials which exert or cause:

A. Unusual B.O.D., chemical oxygen demand or chlorine requirements in such quantities as to constitute a significant load on the wastewater treatment facility.

B. Unusual volume of flow or concentration of wastes constituting “slugs” as defined herein.

C. Unusual concentrations of inert suspended solids (such as, but not limited to fuller’s earth, lime slurries and lime residues) or of dissolved solids (such as, but not limited to sodium chloride and sodium sulfate).

D. Excessive discoloration (such as, but not limited to dye wastes and vegetable tanning solutions).

  1. Damaging Substances. Any waters or wastes which, by interaction with other water or wastes in the sanitary sewer system, release obnoxious gases, form suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.

  2. Incompatible Pollutants. Incompatible pollutants in excess of the allowed limits as determined by local, State and Federal laws and regulations in reference to pretreatment standards developed by the Environmental Protection Agency, 40 CFR 403, as amended from time to time.

  3. Untreatable Wastes. Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or are amenable to treatment only to such degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.

97.05    RESTRICTED DISCHARGES – POWERS. If any waters or wastes are discharged, or are proposed to be discharged to the public sewers, which waters contain the substances or possess the characteristics enumerated in Section 97.04 and which in the judgment of the Superintendent may have a deleterious effect upon the sewage works, processes, equipment, or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the Superintendent may:

1. Rejection. Reject the wastes by requiring disconnection from the public sewage system;

2. Pretreatment. Require pretreatment to an acceptable condition for discharge to the public sewers;

3. Controls Imposed. Require control over the quantities and rates of discharge; and/or

4. Special Charges. Require payment to cover the added cost of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions of Chapter 99.

97.06    SUBMISSION OF BASIC DATA. The Superintendent may require each person who discharges or seeks to discharge industrial wastes to a public sewer to prepare and file with the Superintendent, at such times as the Superintendent determines, a report that shall include pertinent data relating to the quantity and characteristics of the wastes discharged to the wastewater treatment facilities. In the case of a new connection, the Superintendent may require that this report be prepared prior to making the connection to the public sewers.

97.07    CONTROL MANHOLES. Each person discharging industrial wastes into a public sewer shall, at the discretion of the Superintendent, construct and maintain one or more control manholes or access points to facilitate observation, sampling, and measurement of the wastes, including sanitary sewage. Control manholes or access facilities shall be located and built in a manner acceptable to the Superintendent. If measuring and/or sampling devices are to be permanently installed, they shall be of a type acceptable to the Superintendent. Control manholes, access facilities and related equipment shall be installed by the person discharging the waste, at his or her expense, and shall be maintained by said person so as to be in safe condition, accessible and in proper operating condition at all times. Plans for installation of the control manholes or access facilities and related equipment shall be approved by the Superintendent prior to the beginning of construction.

97.08    WASTE SAMPLING. Industrial wastes discharged into the public sewers shall be subject to periodic inspection and a determination of character and concentration of said wastes. The determination shall be made by the industry as often as may be deemed necessary by the Superintendent. Samples shall be collected in such a manner as to be representative of the composition of the wastes. The sampling may be accomplished either manually or by the use of mechanical equipment acceptable to the Superintendent. Installation, operation and maintenance of the sampling facilities shall be the responsibility of the person discharging the waste and shall be subject to the approval of the Superintendent. Access to sampling locations shall be granted to the Superintendent or a duly authorized representative at all times. Every care shall be exercised in the collection of samples to ensure their preservation in a state comparable to that at the time the sample was taken.

97.09    PRETREATMENT. Persons discharging industrial wastes into any public sewer may be required to pretreat such wastes, if the Superintendent determines pretreatment is necessary to protect the wastewater treatment facilities or prevent the discharge of incompatible pollutants. In that event, such person shall provide, at his or her expense, such pretreatment or processing facilities as may be determined necessary to render wastes acceptable for admission to the sanitary sewers.

97.10    ANALYSES. All measurements, tests and analyses of the characteristics of waters and wastes to which reference is made in this chapter shall be determined in accordance with the latest edition of Standard Methods and with the Federal Regulations of 40 CFR 136, Guidelines Establishing Test Procedures for Analysis of Pollutants, as amended from time to time. Sampling methods, location, time, durations and frequencies are to be determined on an individual basis subject to approval by the Superintendent. Determination of the character and concentration of the industrial wastes shall be made by the person discharging them, or the person’s agent, as designated and required by the Superintendent. The Superintendent may also make analyses on the wastes and these determinations shall be binding as a basis for sewer service charges.

97.11    SUBMISSION OF INFORMATION. Plans, specifications and any other pertinent information relating to proposed flow equalization, pretreatment or grease and/or sand interceptor facilities shall be submitted for review and approval of the Superintendent prior to the start of their construction if the effluent from such facilities is to be discharged into the public sewers. No construction of such facilities shall commence until said approval has been granted.

97.12    SPECIAL ARRANGEMENTS. No statement in these chapters shall be construed as prohibiting any special agreement between the City and any person whereby a waste of unusual strength or character may be admitted to the wastewater treatment facilities, either before or after pretreatment, provided that there is no impairment of the functioning of the wastewater treatment facilities by reason of the admission of such wastes, and no extra costs are incurred by the City without recompense by the person; and further provided that all rates and provisions set forth in Chapter 99 are recognized and adhered to.