No person shall discharge, or cause to be discharged, any stormwater, groundwater, roof runoff, subsurface drainage, downspouts, yard drains, yard fountains and ponds, lawn sprays, water from swimming pools or unpolluted industrial water into any sanitary sewer in the system.
(1989 Code, ch. 10, sec. 6(A))
No person shall discharge, or cause to be discharged, into any public sewer, any of the following described substances, materials, waters, or wastes:
(1) 
Any liquid or vapor having a temperature greater than 122° F (50° C).
(2) 
Any toxic, corrosive, flammable or explosive liquid, solid or gas, such as gasoline, kerosene, phenols, benzene, naphtha, etc.
(3) 
Any water or wastes which contain wax, greases, oil, cleaning solvents, mineral oils or other substances which will solidify at temperatures between 32° to 150° F.
(4) 
Any garbage that has not been properly comminuted or shredded. (The installation and operation of any garbage grinder equipped with a motor of 3/4 HP or greater shall be subject to the review of the city administrator or his designee.)
(5) 
Any solid or viscous substances, such as ashes, cinders, sand, mud, gravel, straw, tar, asphalt, ceramic wastes, shavings, sawdust, whole blood, paunch manure, hair and fleshings, entrails, lime slurry, lime residues, slops, chemical residues, paint residues, or bulk solids.
(6) 
Any heavy metals such as those listed below:
Antimony
Arsenic
Barium
Beryllium
Bismuth
Boron
Cadmium
Chromium (Hexa)
Chromium (Tri)
Cobalt
Copper
Iron
Lead
Manganese
Mercury
Molybdenum
Nickel
Rhenium
Selenium
Silver
Strontium
Tellurium
Tin
Uranyl ion
Zinc
(7) 
Any radioactive wastes or isotopes of such half-life or concentration that exceeds limits established by the U.S. Public Health Service for public drinking water standards.
(8) 
Any wastes or waters 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.
(1989 Code, ch. 10, sec. 6(B))
Discharge into the city sewer system shall consist only of domestic sewage, properly shredded garbage, industrial wastes and other wastes which are free from the prohibited constituents listed above and limited in BOD, suspended solids, dissolved sulfides, and pH as follows:
(1) 
Biochemical oxygen demand (BOD) of such wastes delivered shall not exceed 300 ppm, as determined by Standard Methods.
(2) 
Suspended solids delivered shall not exceed 250 ppm, as determined by Standard Methods.
(3) 
Hydrogen ion concentration (pH) of the sewage delivered shall be no lower than 6.0 nor higher than 9.5 and any acid waste shall not be discharged unless neutralized to a pH of 6.0 or more.
(4) 
Dissolved sulfides in the wastes delivered to the system shall not exceed 0.1 ppm.
(5) 
Alkalinity shall not exceed 400 ppm.
(1989 Code, ch. 10, sec. 6(C))
The volume and rate of flow of wastes to the sewer system shall not be in excess of the capacity of the facility provided, as determined and regulated by the city utilities department and the city administrator.
(1989 Code, ch. 10, sec. 6(D))
(a) 
Any persons or owners discharging industrial wastes into the sewer system which exhibit any of the prohibited wastes set out in section 13.06.082 shall pretreat or otherwise dispose of such industrial waste as to make the remaining wastes meet the requirements of section 13.06.083 and be acceptable to the city utility department. Any such person or owner shall provide and maintain, in a suitable accessible position on his premises, an inspection chamber or control manhole near the outlet of such sewer prior to the discharge into the city system. Every such chamber shall be of such design and construction which will prevent infiltration of any water or foreign matter into the city system and shall be so maintained by the person discharging wastes so that any authorized representative of the city may readily and safely measure the volume and obtain samples of the flow at all times. Where pretreatment or equalization of waste flows is practiced prior to discharge to the city’s sewer system, the design and installation of the plants and equipment of said pretreatment or equalization facilities shall be subject to the review and approval of the city administrator, and subject to the requirements of all applicable codes, ordinances, and laws.
(b) 
Grease, oil and sand interceptors shall be provided for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand, and other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of a type and capacity approved by the city administrator and shall be located as to be readily accessible for cleaning and inspection. Grease and oil interceptors shall be constructed of impervious materials capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, watertight, and equipped with easily removable covers which when bolted in place shall be gastight and watertight.
(c) 
No statement contained in this section 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 for any portion of the excess cost to the city of handling and treating such industrial wastes, as may be established by the city council.
(d) 
No unauthorized person shall maliciously, willfully, or negligently break, damage, uncover, deface or tamper with any structure, appurtenance, or equipment which is a part of the municipal sewage works. Any person violating this provision shall be subject to immediate arrest under charge of disorderly conduct.
(1989 Code, ch. 10, sec. 6(E))
The city administrator and other duly authorized employees of the city bearing proper credentials and identification shall be permitted to enter upon all properties for the purpose of inspection, observation, measurement, sampling, and testing, in accordance with the provisions of this division.
(1989 Code, ch. 10, sec. 6(F))
Any person found to be violating any provision of this division shall be served by the city with written notice stating the nature of the violation and providing a reasonable time limit for the satisfactory correction thereof. The offender shall, within the period of time stated in such notice, permanently cease all violations. If the offender continues violation after the expiration of the time stated, the city council may prohibit the further use of the sewage system by the offender and may remove or close the offender’s sewage and water connections. Any person who shall continue any violation beyond the time limit provided shall be guilty of a misdemeanor, and upon conviction thereof shall be fined as provided for in section 1.01.009 of this Code of Ordinances. Each day in which any such violation shall continue shall be deemed a separate offense. Any person violating any of the provisions of this division shall become liable to the city for any expense, loss, or damage occasioned by the city by reason of such violation.
(1989 Code, ch. 10, sec. 6(G))
All measurements, tests, and analyses of the characteristics of waters and wastes to which reference is made in this division shall be determined in accordance with the latest edition of Standard Methods for the Examination of Water and Wastewater, published jointly by the American Public Health Association, the American Water Works Association, and the Water Environment Federation, 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 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 sewage works and to determine the existence of hazards to life, limb, and property. The particular analyses involved will determine whether a twenty-four (24) hour composite of all outfalls of the premises is appropriate or whether a grab sample or samples shall be taken.
(1989 Code, ch. 10, sec. 6(H))