Stormwater other than that exempted under Section 13.20.440 and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as combined sewers or storm sewers, to a natural outlet approved by the city, and in compliance with this code, the Wyoming State Department of Health, and the Wyoming Department of Environmental Quality. Unpolluted industrial cooling water or process waters may be discharged to a storm sewer, combined sewer or natural outlet, upon approval of the city.
(Prior code § 21-42)
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, the sludge of any municipal system, the wastewater treatment process or equipment, will not have an adverse effect on the receiving stream, or will not otherwise endanger lives, limb, public property, or constitute a nuisance. The city may set limitations lower than the limitations established in the regulations below if such, more severe, limitations are necessary to meet the above objectives. In forming an opinion as to the acceptability, the city will comply with this code and 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 sewer, the wastewater treatment process employed, capacity of the wastewater treatment plant, and other pertinent factors. 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 city are as follows:
A. 
Wastewater having a temperature higher than 150 degrees Fahrenheit (65 degrees Celsius);
B. 
Wastewater containing more than 25 milligrams per liter of petroleum oil, or biodegradable cutting oils, or product of mineral oil origin.
(Prior code § 21-43)
Grease, oil and sand interceptors shall be provided when, in the opinion of the city, they are necessary for the proper handling of liquid wastes containing floatable grease in excessive amounts, or any flammable wastes, sand or other harmful ingredients; except that such interceptors shall be of a type and capacity approved by the city and the Uniform Plumbing Code, as adopted by the city, and shall be located as to be readily and easily accessible for cleaning and inspection. In the maintaining of these interceptors, the property owner(s) shall be responsible for the proper removal and disposal by appropriate means of the captivated material and shall maintain records of the dates and means of disposal which are subject to review by the city. Any removal and hauling of the collected materials not performed by owner(s) personnel must be performed by currently licensed waste disposal firms.
(Prior code § 21-44)
When required by this code, the owner(s) of any property serviced by a building sewer carrying industrial wastes shall install a suitable structure, together with such necessary meters and other appurtenances, in the building sewer to facilitate observation, sampling and measurement of the wastes. Such structures, when required, shall be accessibly and safely located, and shall be constructed in accordance with plans approved by the city. The structure shall be installed by the owner at his or her expense, and shall be maintained by him or her so as to be safe and accessible at all times.
(Prior code § 21-46)
The city may require a use of sewer services to provide information needed to determine compliance with this title. These requirements may include:
A. 
Wastewater's discharge peak rate and volume over a specified time period;
B. 
Chemical analyses of wastewaters;
C. 
Information on raw materials, processes and products affected by wastewater volume and quality;
D. 
Quantity and disposition of specific liquid, sludge, oil, solvent or other materials important to sewer use control;
E. 
A plot plan of sewers on the user's property showing sewer and pretreatment facility location;
F. 
Details of wastewater pretreatment facilities;
G. 
Details of systems to prevent and control the losses of materials through spills to the municipal sewer.
(Prior code § 21-47)
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 for the Examination of Water and Wastewater, published by the American Public Health Association. Sampling methods, location, times, durations and frequencies are to be determined on an individual basis, subject to approval by the city.
(Prior code § 21-48)
No statement contained in this article shall be construed as preventing any special 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.
(Prior code § 21-49)
Any duly authorized employees are authorized to obtain information concerning industrial processes which have a direct bearing on the kind and source of discharge to the wastewater collection system. The industry may withhold information considered confidential. The industry must establish that the revelation to the public of the information in question might result in an advantage to competitors.
(Prior code § 21-51)
While performing the necessary work on private properties, employees of the city shall observe all safety rules applicable to the premises established by the company, and the company shall be held harmless for injury or death to the city employees, and the city shall indemnify the company against loss or damage to its property by city employees and against liability claims and demands for personal injury or property damage asserted against the company growing out of the gauging and sampling operation, except as such may be caused by negligence or failure of the company to maintain safe conditions.
(Prior code § 21-52)
A. 
If any waters or wastes are discharged, or are proposed to be discharged to the public sewers which may have a deleterious effect upon the wastewater facilities, processes, equipment or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the city may:
1. 
Reject the wastes;
2. 
Require the 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 Section 13.20.340.
B. 
If the city 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 city and in compliance with this code, the Department of Environmental Quality, and the Wyoming State Department of Health.
(Prior code § 21-53)