1. Any pollutants including 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. Waste streams shall not have a closed-cup flashpoint of less than 140° F (60° C) using the test methods specified in 40 CFR 261.21;

2. 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;

3. Wastewater having a pH less than 5.5 or more than 11.0. In no case can a wastewater cause corrosive structural damage to the POTW or equipment, or cause the POTW's effluent to be less than 6.0 or greater than 9.0 (40 CFR 133.102(c)(2));

4. Solid (greater than 1/4" in any dimension) or viscous substances which will or may cause obstruction to the flow in a sewer or other interference with the operation of the POTW;

5. Grease, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, sand, spent lime, stone or marble dust, metal, glass, grass clippings, rags, spent grains, waste paper, wood, plastic, gases, tar, asphalt residues, residues from refining or processing of fuel or lubricating oil, dental amalgams, clay materials, glass grinding and polishing wastes in amounts that would adversely affect the POTW or the treatment plant effluent, residues or biosolids;

6. 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;

7. Wastewater having a temperature which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104° F (40 C) unless the Approval Authority, upon the request of the POTW, approves alternate temperature limits;

8. Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin, in excess of the local limits, or in amounts that will cause interference or pass through;

9. Any of the following non-polluted discharges unless approved by the Manager under extraordinary circumstances, such as lack of direct discharge alternatives due to combined sewer service or need to augment sewage flows due to septic conditions:

10. Trucked or hauled pollutants, except as specifically approved by the Manager and at discharge points designated by the County;

11. The contents of any tank or other vessel owned or used by any person in the business of collecting or pumping sewage, effluent, septage, or other wastewater unless said person has first obtained testing and approval as may be generally required by the County and paid all fees assessed for the privilege of said discharge;

12. 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, thereby violating the County's NPDES permit or other applicable regulations. Color (in combination with turbidity) shall not cause the treatment plant effluent to reduce the depth of the compensation point for photosynthetic activity by more than 10 percent from the seasonably established norm for aquatic life;

13. Wastewater containing any radioactive wastes or isotopes except as specifically approved by the Manager in compliance with applicable State or federal regulations and when such person is licensed for the use of those radioactive materials by the Department of Health and the waste meets all requirements of WAC 246-221-190, "Disposal by release into sanitary sewerage systems", and the average concentration limits as defined in WAC 246-221-190 Appendix A, Table I, Column 2, and WAC 246-221-300 Appendix B;

14. Any sludges, screenings, or other residues from the pretreatment of industrial wastes or from industrial processes, unless specifically authorized by the Manager;

15. Medical wastes, except as authorized by the Manager;

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

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

18. Any substance which will cause the POTW to violate its NPDES permit and/or other disposal system permits;

19. Any wastewater, which in the opinion of the Manager, can cause harm either to the sewers, sewage treatment process, or equipment; have an adverse effect on the receiving stream; or can otherwise endanger life, limb, public property, or constitute a nuisance, unless allowed under special agreement by the Manager (except that no special waiver shall be given from categorical pretreatment standards, unless authorized by federal pretreatment regulations);

20. Any dangerous, hazardous, or extremely hazardous wastes as defined in rules published in Chapter 173-303 WAC or in EPA rules 40 CFR Part 261 except as authorized by the County in an industrial pretreatment permit or other applicable permit, control mechanism, or applicable regulation.

21. Persistent pesticides and/or pesticides, such as those regulated by the Federal Insecticide Fungicide Rodenticide Act (FIFRA), in amounts that would have adverse effects on the POTW, treatment plant effluent, biosolids, or the environment;

22. Any substance which may cause the POTW's effluent or treatment residues, biosolids, or scum to be unsuitable for reclamation and reuse, or which may interfere with the reclamation process. Under no circumstances can a substance be discharged to the POTW which would cause the biosolids to be rendered unsuitable for beneficial utilization, such as land application;

23. Any slug load, which shall mean any pollutant (including suspended solids and BOD), and any other matter or flow, released in a single extraordinary discharge episode of such volume or strength as to cause interference to the POTW.