A. 
No person shall discharge or cause to be discharged any stormwater, surface water, groundwater, roof runoff, subsurface drainage, uncontaminated cooling water, or unpolluted industrial process waters to any sanitary sewer other than such discharge as is present at the time of passage of this Part 1. All new or altered connections, excluding ordinary repairs, to the sanitary wastewater system shall conform with this section.
B. 
Stormwater and all other unpolluted drainage shall be discharged to such drains as are specifically designated as storm drains or combined sewers, or to a natural outlet approved by the Director. Industrial cooling water or unpolluted process waters may be discharged, on approval of the Director, to a storm drain, combined sewer, or natural outlet.
No person shall discharge or cause to be discharged any of the following described waters or wastes to any public sewers:
A. 
Any gasoline, benzene, naphtha, fuel oil, or other flammable or explosive liquid, solid or gas;
B. 
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 wastewater 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 plant;
C. 
Any waters or wastes having a pH lower than 5.5, or having any other corrosive property capable of causing damage or hazard to structures, equipment, and personnel of the wastewater works;
D. 
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 wastewater 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 fleshing, entrails, and paper dishes, cups, milk containers, etc., either whole or ground by garbage grinders.
A. 
No person shall discharge or cause to be discharged the following described substances, materials, waters, or wastes if it appears likely, in the opinion of the Director, that such wastes can harm either the sewers, wastewater treatment process, or equipment, have an adverse effect on the receiving stream, or can otherwise endanger life, limb, public property, or constitute a nuisance.
B. 
In forming his opinion as to the acceptability of these wastes, the Director will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature of the wastewater treatment process, capacity of the wastewater treatment plant, degree of treatability of wastes in the wastewater treatment plant, and other pertinent factors.
C. 
The substances restricted are:
(1) 
Any liquid or vapor having a temperature higher than 140° F., or such lower temperature specified by the Director to ensure that the temperature of influent wastewater at the City's wastewater treatment works does not exceed 104° F.
(2) 
Any water or waste containing fats, wax, grease, or oils, whether emulsified or not, in excess of 100 mg/liter or containing substances which may solidify or become viscous at temperatures between 32° F. and 150° F. (0° C. and 65° C.).
(3) 
Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of 3/4 horsepower (0.76 horsepower metric) or greater shall be subject to the review and approval of the Director.
(4) 
Any waters or wastes containing strong acid iron pickling wastes, or concentrated plating solutions whether neutralized or not.
(5) 
Any waters or wastes containing phenols or other taste- or odor-producing substances in such concentrations as to exceed the limits established by the Director and/or the requirements of the state, federal or other public agencies or jurisdictions for such discharge or the receiving waters.
(6) 
Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Director in compliance with applicable state or federal regulations.
(7) 
Any waters or wastes having a pH in excess of 9.0.
(8) 
Materials which exert or cause:
(a) 
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).
(b) 
Color or turbidity in such an amount that it will prevent the City from discharging a treated effluent in compliance with the water quality standards.
(c) 
Unusual BOD, chemical oxygen demand, or chlorine demand in such quantities as to constitute a significant load on the wastewater treatment plant.
(d) 
Unusual volume of flow or concentration of wastes constituting "slugs" as defined in this Part 1.
(9) 
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 a degree that the treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
(10) 
Septic tank solids that are not diluted sufficiently to assure that all particles will be carried freely under all flow conditions in the wastewater facilities.
A. 
If any waters or wastes are discharged or are proposed to be discharged to the public sewers, which waters contain the substances in excess of the limits which may be established by the Director or possess the characteristics which, in the judgment of the Director, may have a deleterious effect upon the wastewater works, processes, equipment, or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the Director may:
(1) 
Reject the wastes;
(2) 
Require pretreatment to an acceptable condition for discharge to the public sewers;
(3) 
Require control over the quantities and rates of discharge; and/or
(4) 
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 this Part 1. The amount to be assessed shall include not only the aforementioned costs but also costs of ascertaining responsibilities.
B. 
If the Director permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the Director and subject to the requirements of all applicable codes, ordinances and laws.
A. 
Any waters or wastes containing heavy metals, including but not limited to arsenic, barium, cadmium, chromium, cobalt, copper, lead, nickel, tin, silver, gold, or zinc, will require pretreatment before discharge to the City's system. Pretreatment shall be such as to reduce the concentration of heavy metals by appropriate methods in the pretreatment system effluent to a level equal to or less than the solubility of the oxide of hydroxide of the heavy metal.
B. 
Sludges resulting from the pretreatment process may not be discharged to the sewerage system. The above requirement is in compliance with the policy of the Massachusetts Division of Water Pollution Control. Stricter limits may be imposed if it is found necessary to meet water quality standards. Industries discharging or requesting to discharge beryllium, mercury, arsenic or selenium in any quantity will additionally obtain approval of the Division of Water Pollution Control or their appointed successors.
A. 
Grease, oil, and sand interceptors shall be provided when, in the opinion of the Director, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand, or other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units.
B. 
All interceptors shall be of a type and capacity approved by the Director and shall be located so as to be readily and easily accessible for cleaning and inspection.
A. 
When required by the Director, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable control manhole together with such necessary meters and other appurtenances in the building sewer to facilitate observation, sampling, and measurement of the wastes.
B. 
Such manholes, when required, shall be accessibly and safety located and shall be constructed in accordance with plans approved by the Director.
C. 
The manhole shall be installed by the owner at his expense and shall be maintained by him so as to be safe and accessible at all times.
A. 
All measurements, tests and analyses of the characteristics of waters and wastes to which reference is made in this Part 1 shall be determined in accordance with the latest edition of Standard Methods for the Examination of Water and Wastewater, published by the American Public Health Association, and shall be determined at the control manhole provided or upon suitable samples taken at said control manhole. In the event that no special manhole has been required, the control manhole shall be considered to be the nearest downstream manhole in the public sewer or private sewer to the point at which the building sewer is connected. Sampling shall be carried out by customarily accepted methods to reflect the effect of constituents upon the wastewater works and to determine the existence of hazards to life, limb, and property. (The particular analyses involved will determine whether a twenty-four-hour composite of all outfalls of a premises is appropriate or whether a grab sample or samples should be taken. Normally, but not always, BOD and suspended solids analyses are obtained from twenty-four-hour composites of all outfalls, whereas pHs are determined from periodic grab samples.)
B. 
Furnishing required analyses, flow data, etc., shall be the responsibility of the applicant. The Director will stipulate the minimum analyses and other data that shall be obtained and shall conduct such wastewater sampling and measuring programs as are requested by the applicant. Expenses thus incurred by the City shall be assessed to the applicant.
C. 
All industries discharging into a public sewer system shall perform such monitoring of their discharges as the Director and/or other duly authorized employees of the City may reasonably require, including installation, use, and maintenance of monitoring equipment, keeping records and reporting the results of such monitoring to the Director. Such records shall be made available by the Director, upon request, to other governmental agencies or City departments having jurisdiction over discharges to receiving water.
A. 
No statement contained in this article shall be construed as preventing any agreement or arrangement between the City and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the City for treatment, subject to payment therefor, by the industrial concern.
B. 
Such agreement or arrangement shall first be approved by the City Council and the Mayor.
C. 
Such agreements may not waive pretreatment standards (local and categorical), unless such a waiver is granted by mechanisms established under the general pretreatment regulations. Prohibited discharge standards may not be waived under any circumstances.
Where preliminary treatment or flow-equalizing facilities are provided for any waters or wastes, they shall be maintained continuously in a condition satisfactory to the Director and be effectively operated by the owner at the owner's expense.
No septic tank solids shall be discharged to the City's wastewater system except by specific permission of the Director. The Director shall designate the locations where septic tank solids may be discharged to the wastewater system and the conditions for such discharge.