(a) Pollutants which either alone or by interaction may create a fire or explosive hazard in the POTW, a public nuisance or hazard to life, or prevent entry into the sewers for their maintenance and repair or are in any way injurious to the operation of the system or operating personnel. This includes waste streams with a closed-cup flashpoint of less than 140 degrees Fahrenheit (60 degrees Celsius) using the test methods specified in 40 CFR 261.21.

(b) Wastewater having a pH less than 5.0 or more than 11.0, or otherwise having any other corrosive property capable of causing damage or hazard to structures, equipment, or personnel. Discharges outside this pH range may be authorized by a permit issued by the Town pursuant to a finding that the system is specifically designed to accommodate a discharge of that pH.

(c) Solid or viscous substances in amounts which may cause obstruction to the flow in the sewer or other interference with the operation of the system. In no case shall solids greater than 1/4 inch (0.64 centimeters) in any dimension be discharged.

(d) 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.

(e) Wastewater having a temperature which will interfere with the biological activity in the system, has detrimental effects on the collection system, or prevents entry into the sewer. In no case shall wastewater be discharged which causes the wastewater temperature at the treatment plant to exceed 104 degrees Fahrenheit (40 Celsius).

(f) Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through.

(g) 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.

(h) Trucked or hauled pollutants.

(i) The following are prohibited unless approved by the Public Works Superintendent 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 (as required under WAC 173-216-050).

(j) 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.

(k) 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 Town’s state waste discharge permit.

(l) Wastewater containing any radioactive wastes or isotopes except in compliance with applicable state or federal regulations.

(m) Storm water, surface water, ground water, 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 Superintendent.

(n) Sludges, screenings, or other residues from the pretreatment of industrial wastes.

(o) Medical wastes, except as specifically authorized by the Public Works Superintendent in a wastewater discharge permit.

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

(q) Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW.

(r) Fats, oils, or greases of animal or vegetable origin in concentrations greater than three hundred (100) mg/l, or total petroleum hydrocarbon concentrations of no more than one hundred (50) mg/l.

(s) 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 10 percent or any single reading over 20 percent of the lower explosive limit based on an explosivity meter reading.