No person shall discharge or cause to be discharged any unpolluted waters, such as stormwater, groundwater, roof runoff, subsurface drainage, or cooling water, to any sanitary sewer.
Stormwater shall be discharged to such sewers as are specifically designated storm sewers or to a natural outlet approved by the Department. Unpolluted industrial cooling water or process waters may be discharged, on approval of the Department or other regulatory agencies, to a storm 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, naptha, fuel oil or other flammable or explosive liquid, solid or gas.
B. 
Any waters 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 waste 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 greater than 9.0 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 the sewers or other interference with the proper operation of the wastewater facilities, such as, but not limited to, ashes, bones, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, woods, unground garbage, whole blood, paunch manure, hair and fleshings, entrails and paper dishes, cups, milk containers, etc., either whole or ground by garbage grinders.
A. 
The following described substances, materials, waters, or wastes shall be limited in discharges to municipal systems to concentrations or quantities which will not harm either the sewers, wastewater treatment process or equipment, will not have an adverse effect on the receiving stream, or will not otherwise endanger life, limb or public property, or constitute a nuisance.
B. 
The Department may set limitations lower than the limitations established in the regulations below if, in its opinion, such more severe limitations are necessary to meet the above objective. In forming an opinion as to the acceptability, the Department will give consideration to such factors as the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction of the sewers, the wastewater treatment process employed, capacity of the wastewater treatment plant, degree of treatability of the waste in the wastewater treatment plant, and other pertinent factors.
C. 
The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the sanitary sewer which shall not be violated without approval of the Department are as follows:
(1) 
Wastewater having a temperature higher than 150° F. (65° C.).
(2) 
Any wastewater containing fats, wax, grease, or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32° F. and 160° F. (0° C. and 65° C.).
(3) 
Any garbage that has not been properly shredded. 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.
(4) 
Any waters or wastes containing iron, chromium, copper, zinc, and similar objectionable or toxic substances to such a degree that any such material received in the composite wastewater at the wastewater treatment works exceeds the limits established by the Department for such materials.
(5) 
Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Department.
(6) 
Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Department in compliance with applicable state or federal regulations.
(7) 
Quantities of flow, concentrations, or both which constitute a slug, as defined herein.
(8) 
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 degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
(9) 
Any water or wastes which, by interaction with other water or wastes in the public sewer system, release obnoxious gases, form suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.
No person shall discharge or convey, or permit or allow to be discharged or conveyed, to a public sanitary sewer any wastewater containing incompatible pollutants of such character or quality that will:
A. 
Violate pretreatment standards.
B. 
Cause the wastewater treatment works to violate its SPDES permit requirements.
C. 
Violate the provisions of this chapter or other applicable laws, rules or regulations.
D. 
Not be susceptible to treatment or interfere with the process or efficiency of the treatment system.
The following are maximum concentrations of pollutants allowable in wastewater discharges to the wastewater treatment system. Dilution of any wastewater discharge for the purpose of satisfying these requirements shall be considered a violation of this chapter.
Contaminant
Maximum Concentration for Oakfield WWTF
(mg/l)
Copper
0.1
Zinc
0.5
Lead
0.1
Boron
1.0
Chromium
3.0
Nickel
0.5
Cyanides
2.0
Sodium chloride
10,000
Free oil
50