1. Any liquid or vapor having a temperature higher than one hundred fifty degrees Fahrenheit (sixty-six degrees Celsius), or which will inhibit biological activity in the treatment plant, resulting in interference, but in no case higher than one hundred four degrees Fahrenheit (forty degrees Celsius) at introduction into the wastewater treatment plant.

2. Any waters or wastes containing oil and grease such that the discharge results in a stoppage, plugging, breakage, significant obstruction to flow or any other damage to or increased maintenance of sewers or sewerage facilities. No person shall discharge oil and grease which results in pass-through and/or interference.

3. Any liquids, solids or gases which by reason of their nature or quantity are or may be sufficient, either alone or by interaction with other substances, to cause fire or explosion or be injurious in any other way to the POTW and/or cause acute worker health and safety problems to its personnel or to the operation of the system.

4. Any waters or wastes that have a closed cup flashpoint of less than one hundred forty degrees Fahrenheit (sixty degrees Celsius), using the test methods specified in 40 CFR 261.21. Prohibited materials include, but are not limited to, gasoline, kerosene, naphtha, benzene, toluene or xylene.

5. Any solid or viscous substance, including but not limited to unground garbage, feathers, ashes, cinders, sand, polishing compounds, resin beads, metal, glass, straw, rags, spent grains or hops, wood, plastic, mud, shavings or manure which may cause obstruction to the flow in sewers or other interference with the proper operation of the POTW.

6. Any waters or wastes having pH lower than 5.0 or higher than 9.0, or having any other corrosive property capable of causing damage or hazard to structures, equipment or personnel of the POTW.

7. Any water added to a wastewater discharge for the sole purpose of dilution as a means to achieve compliance with any pretreatment standard or local discharge limit.

8. Any waters or wastes including oxygen demanding pollutants (BOD, etc.) at a flow rate and/or concentration which, either singly or by interaction with other pollutants, will cause interference or pass-through.

9. Any average daily flow greater than two percent of the WWTP average daily sewage flow.

10. Any petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass-through.

11. Any trucked or hauled pollutants, except at discharge points designated by the director.

12. Any waters or wastes containing any radioactive materials or wastes of such half-life or concentration that they do not comply with regulations issued by appropriate authorities (Sections 30285 and 30287 of the California Code of Regulations).

13. Any infectious wastes.

14. Any medical wastes, except as specifically authorized by the director in an individual wastewater discharge permit or a general permit.

15. Any waters or wastes containing color which is not removed in the ordinary WWTP treatment process.

16. Any noxious or malodorous liquids, gases, solids, or other wastewater which either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry into the sewers for maintenance or repair.

17. Any stormwater, surface water, ground water, artesian well water, roof runoff, subsurface drainage, condensate, deionized water, noncontact cooling water, and unpolluted wastewater, unless specifically authorized by the director.

1. The director is authorized to establish local limits pursuant to 40 CFR 403.5(c).

2. The following pollutant limits are established to protect against pass-through and interference. No person shall discharge wastewater containing in excess of the following:

3. Unless otherwise stated in individual discharge permit, the uniform limits shall apply to all dischargers. Application for contributory Limit A or B may be made to the director. The director’s decision shall be the city’s final decision.

4. The above limits apply at the point where the wastewater is discharged to the POTW. All concentrations for metallic substances are for total metal unless indicated otherwise. The director may impose mass limitations in addition to the concentration based limitations above.

1. The director determines that the limitations listed in this chapter may not be sufficient to protect the operation of the city’s treatment works; or

2. The director determines that the limitations listed in this chapter may not be sufficient to enable the city’s treatment works to comply with water quality standards or effluent limitations specified in the city’s NPDES permit.

1. Advise the user of the impact of the contribution on the POTW;

2. Develop effluent limitations for the user to correct;

3. Place limits on rate and time of discharge or requirements for flow regulations and equalization;

4. Require pretreatment of discharge prior to discharge to POTW; or

5. Take any other action necessary to eliminate the interference.

1. The water is discharged by pumping and shall not exceed the capacity of the sewer lateral and/or public main.

2. Each swimming pool discharging to a sewer system shall be equipped with an indirect waste connection to preclude any possibility of a backflow of sewage into the swimming pool or piping system. (Ord. 1598 § 1 (part), 2014)