1. All non-stormwater discharges to the stormwater drainage system, unless such discharges are authorized in accordance with Chapter 173-216 (State Waste Discharge Permit Program) or 173-220 WAC (National Pollutant Discharge Elimination System Permit Program);

2. Any solid, dangerous, or extremely hazardous waste, as defined by Chapter 173-304 (Minimum Functional Standards for Solid Waste Handling) or 173-303 WAC (Dangerous Waste Regulations);

3. Any substance that, when released into the environment, may cause non-compliance with Chapter 246-290 (Public Water Supplies); 173-200 (Water Quality Standards for Ground Waters of the State of Washington), 173-201 (Water Quality Standards for Surface Waters of the State of Washington), 173-204 (Sediment Management Standards); or 173-340 WAC (The Model Toxics Control Act Cleanup Regulation);

4. Trash or debris;

5. Construction materials and residues;

6. Petroleum products, including, but not limited to: oil, gasoline, grease, fuel oil and heating oil;

7. Antifreeze and other automotive products;

8. Metals in either particulate or dissolved form;

9. Flammable or explosive materials;

10. Radioactive material;

11. Batteries;

12. Acids, alkalis, or bases;

13. Paints, stains, resins, lacquers, or varnishes;

14. Degreasers and/or solvents;

15. Drain cleaners;

16. Pesticides, herbicides, or fertilizers;

17. Steam cleaning wastes;

18. Uncured concrete wash water (generated during cleaning, finishing or during exposure of aggregate);

19. Soaps, detergents, or ammonia;

20. Swimming pool, spa, or hot tub drainage, cleaning wastewater, or filter backwash;

21. Chlorine, bromine, or other disinfectants;

22. Heated water;

23. Animal wastes;

24. Sewages;

25. Recreational vehicle waste;

26. Animal carcasses;

27. Earth in quantities which cause violation of state water quality standards;

28. Wash water, sediment, and debris from street sweeping and street washing;

29. Food wastes;

30. Bark and other fibrous materials;

31. Lawn clippings, leaves, or branches;

32. Silt, sediment, concrete, cement or gravel;

33. Dyes (except as described in subsection C of this section under “Allowable Discharges”);

34. Chemicals, including suspected metals, not normally found in uncontaminated water;

35. Any other process-associated discharge except as otherwise allowed in this section;

36. Any hazardous material or waste not listed above.

1. The construction, use, maintenance or continued existence of illicit connections to the stormwater drainage system is prohibited.

2. This prohibition expressly includes, without limitation, illicit connections made in the past, regardless of whether the connection was permissible under law or practices applicable or prevailing at the time of connection.

3. A person is considered to be in violation of this chapter if the person connects a line conveying sewage to the municipal separate storm sewer system, or allows such a connection to continue.

1. Diverted stream flows;

2. Rising groundwaters;

3. Uncontaminated groundwater infiltration (as defined in 40 CFR 35.2005(b)(20));

4. Uncontaminated pumped groundwater;

5. Discharge from foundation drains;

6. Air conditioning condensation;

7. Irrigation water from agricultural sources that is commingled with urban stormwater;

8. Springs;

9. Uncontaminated water from crawl space pumps;

10. Water from footing drains;

11. Flows from riparian habitats and wetlands;

12. Discharges resulting from dye testing authorized by the city;

13. Non-stormwater discharges covered by another NPDES permit;

14. Discharges from emergency firefighting activities by a fire department or a fire district.

1. Potable water, including water from water line flushing, hyperchlorinated water line flushing, fire hydrant system flushing, and pipeline hydrostatic test water. Planned discharges shall be de-chlorinated to a concentration of 0.1 parts per million (ppm) or less, pH-adjusted, if necessary, and in volumes and velocities controlled to prevent resuspension of sediments in the stormwater drainage system.

2. Lawn watering and other irrigation runoff are permitted but shall be minimized through, at minimum, public education and water conservation efforts.

3. De-chlorinated swimming pool, spa and hot tub discharges. These discharges shall be de-chlorinated to a total residual chlorine concentration of 0.1 ppm or less, pH-adjusted, and re-oxygenated, if necessary and in volumes and velocities controlled to prevent re-suspension of sediments in the stormwater drainage system. Discharge shall be thermally controlled to prevent increase in temperature of the receiving water.

4. Street and sidewalk wash water, used to control dust, and routine external building wash down that does not use detergents are permitted if the amount of street wash and dust control water used is minimized. At active construction sites, street sweeping must be performed prior to washing the street.

5. Non-stormwater discharges covered by another NPDES permit; provided, that the discharger is in full compliance with all requirements of the permit, waiver, or order and other applicable laws and regulations; and provided, that written approval has been granted for any discharge to the stormwater drainage system.

6. Other non-stormwater discharges. The discharges shall be in compliance with the requirements of a stormwater pollution prevention plan (SWPPP) reviewed and approved by the city which addresses control of such discharges by applying AKART to prevent pollutants from entering the MS4 system, groundwaters, or a water body. A permit is required for all construction site dewatering and may be required by the city for other non-stormwater discharges approved by the city in a SWPPP. (Ord. 1638 §2, 2023; Ord. 1525 §2 (part), 2017).