1. Pollutants which create a fire or explosive hazard in the POTW, including, but not limited to, wastestreams with 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;

2. Wastewater having a pH less than 5.0, in accordance with 40 CFR 403.5, or otherwise causing corrosive structural damage to the POTW or equipment;

3. Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW resulting in interference, but in no case solids greater than one-half inch in any dimension;

4. Pollutants, including oxygen-demanding pollutants (BOD, etc.), released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;

5. Wastewater having a temperature greater than one hundred fifty degrees Fahrenheit (sixty-five degrees Celsius), or which will inhibit biological activity in the POTW resulting in interference, but in no case heat in such quantities that the temperature at the introduction into the POTW treatment plant exceeds one hundred four degrees Fahrenheit (forty degrees Celsius);

6. Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through;

7. Pollutants which result in the presence of toxic gases, vapors, or fumes within the POTW in a quantity that may cause acute worker health and safety problems;

8. Trucked or hauled pollutants, except at discharge points designated by the public works director;

9. 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;

10. Wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant’s effluent;

11. Any radioactive wastes. In the event of an accidental spill of radioactive material into any public sewer, the person responsible shall:

12. Storm water, surface water, groundwater, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, noncontact cooling water, and unpolluted wastewater, unless specifically authorized by the public works director;

13. Sludges, screenings, or other residues from the pretreatment of industrial wastes;

14. Medical wastes, except as specifically authorized by the public works director in a wastewater discharge permit;

15. Wastewater causing, alone or in conjunction with other sources, the treatment plant’s effluent to fail a toxicity test;

16. Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW;

17. Any dispersed biodegradable oils and fats, such as lard, tallow, or vegetable oil, and any fats, oils, or greases of animal origin in amounts that will cause interference or pass through in the POTW;

18. Wastewater causing two readings on an explosion hazard meter at the point of discharge into the POTW, or at any point in the POTW, of more than ten percent or any single reading over five percent of the lower explosive limit of the meter.