A. 
General Prohibitions – No User shall introduce or cause to be introduced into the POTW or the collection systems any pollutant or wastewater which causes Pass Through or Interference.
These general prohibitions apply to all Users of the POTW whether or not they are subject to Categorical Pretreatment Standards or any other national, state, or local pretreatment standards or requirements.
B. 
Specific Prohibitions – No User shall introduce or cause to be introduced into the POTW the following pollutants, substances, or wastewater:
1. 
Pollutants which, either alone or by interaction, may create a fire or explosive hazard, 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 system personnel. This includes waste streams with a closed-cup flashpoint of less than 140 degrees F (60 degrees C) using the test methods specified in 40 CFR Part 261.21.
2. 
Wastewater having a pH less than 6.0 or more than 9.0 or otherwise having any other corrosive property capable of causing damage or hazard to structures, pipelines, facilities, equipment, or personnel. Discharges outside this pH range may be authorized by the Plant Superintendent through a permit issued by the Member Entity pursuant to a finding that the system is capable of accommodating a discharge of that pH.
3. 
Solid or viscous substances in amounts that may cause obstruction to the flow in the sewer or other interference with the operation of the system. This includes discharge of materials that cause the formation of solids by coagulation of materials already present in the wastewater. In no case shall inert solids greater than 1/4 inch (0.64 cm) in any dimension be discharged.
4. 
Pollutants, including oxygen-demanding pollutants (Biochemical Oxygen Demand, etc.), released in a discharge at a flow rate and/or pollutant concentration which, either individually or by interaction with other pollutants, will cause interference with the POTW.
5. 
Wastewater having a temperature that will interfere with the biological activity in the system, has detrimental effects on the collection system, or prevents entry into the sewer. Water may not be discharged into the collection system at temperatures in excess of 149 degrees F (65 degrees C). In no case shall wastewater be discharged which causes the wastewater temperature in the POTW influent to exceed 104 degrees F (40 degrees C).
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 Plant Superintendent in accordance with Section 3.4 of this Policy.
9. 
The following are prohibited unless approved by the Plant 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).
a. 
Non-contact cooling water in significant volumes.
b. 
Stormwater.
c. 
Wastewaters significantly affecting system hydraulic loading, which do not require treatment or would not be afforded a significant degree of treatment by the system.
10. 
Noxious or malodorous liquids, gases, solids, or other wastewater, which, either individually 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.
11. 
Wastewater which imparts color that cannot be removed by the treatment process, including but not limited to dyes and dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant's effluent, thereby violating TRRWA's NPDES Permit.
12. 
Wastewater containing any radioactive wastes or isotopes except in compliance with applicable state or federal regulations.
13. 
Storm water, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, de-ionized water, non-contact cooling water, and unpolluted wastewater, unless specifically authorized by the Plant Superintendent.
14. 
Sludges, screenings, or other residues from the pretreatment of industrial wastes.
15. 
Medical wastes, except as specifically authorized by the Plant Superintendent and the Member Entity in a Wastewater Discharge Permit.
16. 
Wastewater causing, either individually or by interaction with other wastes, the POTW's effluent to fail a toxicity test.
17. 
Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW.
18. 
Fats, oils, or greases of animal or vegetable origin in concentrations greater than one hundred (100) mg/L.
19. 
Total Petroleum Hydrocarbon concentrations greater than one hundred (100) mg/L.
20. 
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 (10%) or any single reading over twenty percent (20%) of the Lower Explosive Limit based on a combustible gas meter reading.
Pollutants, substances, or wastewater prohibited by this Section shall not be processed or stored in such a manner that they could be discharged to the POTW.
Chapter 173-216 WAC and Chapter 90.48 RCW are hereby adopted by this reference. All Waste materials discharged from a CIU into the POTW must satisfy the provisions thereof.
Any person who constructs or modifies or proposes to construct or modify wastewater treatment facilities must first comply with the regulations for submission of plans and reports for construction of wastewater facilities, Chapter 173-240 WAC. Until the TRRWA is delegated the authority to review and approve such plans under RCW 90.48.110, sources of non-domestic discharges shall request approval for such plans through the Washington State Department of Ecology. To ensure conformance with this requirement, proof of the approval of such plans and one copy of each approved plan shall be provided to the Plant Superintendent and the applicable Member Entity before commencing any such construction or modification.
A. 
The TRRWA Board may establish, by recommendation of the Plant Superintendent, local Discharge and Pretreatment Standards pursuant to 40 CFR Part 403.5(c).
B. 
The pollutant limits in Sections 2.3.D. and 2.3.E. are established to protect against Pass Through and Interference and reflect the application of reasonable treatment technology. No person discharging more than 800 gallons per day shall discharge wastewater in excess of the following Daily Maximum Concentration Limits unless authorized by a Wastewater Discharge Permit issued by the TRRWA and the applicable Member Entity.
C. 
The pollutant 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 Plant Superintendent may impose mass loading limits in addition to concentration-based limits. Such changes shall be reported to the TRRWA Board for informational purposes.
D. 
Local Pollutant Discharge Limits
Analyte
Daily Maximum Concentration Limit
Instantaneous Concentration Limit
Antimony
6.8 mg/L
6.8 mg/L
Arsenic
0.9 mg/L
0.9 mg/L
Cadmium
0.3 mg/L
0.3 mg/L
Chromium +6
4.5 mg/L
4.5 mg/L
Cr +3
5.0 mg/L
5.0 mg/L
Copper
3.5 mg/L
3.5 mg/L
Cyanide (total)
2.2 mg/L
2.2 mg/L
Lead
0.8 mg/L
0.8 mg/L
Mercury
0.02 mg/L
0.02 mg/L
Molybdenum
3.4 mg/L
3.4 mg/L
Nickel
5.0 mg/L
5.0 mg/L
Selenium
1.0 mg/L
1.0 mg/L
Silver
0.1 mg/L
0.1 mg/L
Thallium
0.2 mg/L
0.2 mg/L
Zinc
4.6 mg/L
4.6 mg/L
Fats, oils, & greases of animal or vegetable origin
100 mg/L
100 mg/L
Hydrocarbon-based oils & greases
100 mg/L
100 mg/L
Minimum pH
6.0 standard units
6.0 standard units
Maximum pH
9.0 standard units
9.0 standard units
E. 
Users proposing to discharge a waste stream containing Biochemical Oxygen Demand, Total Suspended Solids, or ammonia in excess of the concentration limits listed below must apply for a TRRWA permit. Provided the proposed Discharge will not interfere with the POTW and a TRRWA permit is issued, such Users shall be subject to surcharges as established under Section 13.2 up to any maximum allowable limit established by the permit.
Analyte
Concentration Limits For Excess Strength Charges
Biochemical Oxygen Demand (BOD5)
350 mg/L
Total Suspended Solids
350 mg/L
Total Ammonia, as ammonia (NH3) and ammonium ion (NH4+)
44 mg/L
F. 
The Plant Superintendant may use the permit process to establish appropriate discharge limits for all other pollutants not listed under this Section 2.3. This includes pollutants subject to regulation under RCRA, volatile or semi-volatile organics, halogenated or brominated compounds, poly-aromatic hydrocarbons, polymers, surfactants, pesticide active ingredients, and other pollutants that may interfere with the POTW. Changes will be ratified by the Board.
G. 
The Plant Superintendent may require Best Management Practices for any category of User that creates a non-domestic waste stream and is required to obtain a TRRWA permit. Such requirements may be applied either in lieu of or in addition to the limits of this Section 2.3. BMPs may also include alternative limits, which may be applied at the end of a specific process or treatment step, instead of at discharge point of the combined effluent.
The TRRWA Board reserves the right to establish more stringent standards or requirements on discharges to the POTW.
No User shall increase the use of process water or in any way attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with a discharge limit unless expressly authorized by an applicable pretreatment standard or requirement. The Plant Superintendent may impose mass loading limitations on Users where deemed appropriate to safeguard against the use of dilution to meet applicable pretreatment standards or requirements.