1. Discharges from Potable Water Sources, Including Waterline Flushing, Hyperchlorinated Waterline Flushing, Fire Hydrant System Flushing and Pipeline Hydrostatic Test Water. Planned discharges shall be dechlorinated to a concentration of one-tenth (0.1) ppm or less, pH adjusted, if necessary (to meet water quality standards), and volumetrically and velocity controlled to prevent resuspension of sediments in the stormwater system. As an option to dechlorinating, planned discharges from potable water sources may be discharged directly to the municipal sanitary sewer system in a manner approved by the director. Planned discharges of waterline and hydrant system flushing need not be dechlorinated at the point of discharge if the discharge methods, location, or dilution will result in a pH concentration less than one-tenth (0.1) ppm at the point the water would enter a natural drainage channel.

2. Discharges from Lawn Watering and Other Irrigation Runoff. Reasonable steps shall be taken to minimize runoff including limiting duration and overspray.

3. Dechlorinated Swimming Pool Discharges. The discharges shall be dechlorinated to a concentration of one-tenth (0.1) ppm or less, pH adjusted, and reoxygenized if necessary, and volumetrically and velocity controlled to prevent resuspension of sediments in the stormwater system and the property owner shall obtain permission from the director. Swimming pool cleaning waste water and filter backwash shall not be discharged to the stormwater system.

4. Street and Sidewalk Wash Water, Water Used to Control Dust, and Routine External Building Wash Down that Does Not Use Detergents. To avoid washing pollutants into the stormwater system, the discharge must minimize the amount of street wash and dust control water used. At active construction sites, street sweeping must be performed prior to washing the street.

5. Other Nonstormwater Discharges. The discharges shall be in compliance with the requirements of the stormwater pollution prevention plan for the discharges as reviewed and approved by the city.

6. Any Discharges from a Construction Site. Discharges must be in conformance with the stormwater pollution prevention plan (SWPPP) reviewed by the city.

7. Combined Sewer Overflow (CSO) Discharges. This discharge must be in conformance with a current National Pollution Discharge Elimination System permit, approved by the Washington State Department of Ecology.

1. Diverted stream flows;

2. Rising ground waters;

3. Uncontaminated ground water infiltration (as defined at 40 CFR Section35.2005(b)(20));

4. Uncontaminated pumped ground water;

5. Foundation drains;

6. Air conditioning condensation;

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

8. Springs;

9. Water from crawl space pumps;

10. Footing drains;

11. Flows from riparian habitats and wetlands;

12. Nonstormwater discharges covered by another NPDES permit;

13. Discharges from emergency firefighting activities in accordance with the city of Aberdeen Stormwater NPDES Phase II Permit, Section S2, Authorized Discharges. The city’s Stormwater NPDES Phase II Permit is available to view in the office of the director.

1. No person shall discharge or cause to be discharged any stormwater, surface water, ground water, roof runoff, subsurface drainage, uncontaminated cooling water, or unpolluted industrial process waters into any sanitary sewer, unless otherwise approved by the director based on lack of feasible alternatives or unless the discharge meets the condition outlined in Section 13.52.390.

2. No person shall make connection of roof downspouts, exterior foundation drains, area drains, or other sources of stormwater surface runoff or ground water to a building sewer or building drain which in turn is connected directly or indirectly to a public sanitary sewer, unless such connection is otherwise approved in writing by the director based on lack of feasible alternatives or other appropriate factors.