§ 53.06  EXCEPTIONS TO DISCHARGE PROHIBITION.
   Subject to the authority granted to the Regional Water Quality Control Board and the enforcement official in § 53.05, the following discharges to the storm water conveyance system are exempt from the prohibition set forth in § 53.05.
   (A)   Any discharge of connections regulated under a NPDES permit issued to the discharger and administered by the State of California pursuant to Division 7, Chapter 5.5 of the California Water Code, provided that the discharger is in compliance with all requirements of the permit and all other applicable laws and regulations;
   (B)   Discharges from the following activities, which do not cause or contribute to the violation of any NPDES permit:
      (1)   Water line flushing and other discharges from potable water sources;
      (2)   Incidental runoff from landscaped areas defined as unintended amounts (volume) of runoff, such as unintended, minimal over-spray from sprinklers that escape the area of intended use;
      (3)   Rising ground waters or springs:
      (4)   Passive foundation and footing drains;
      (5)   Water from crawl space pumps and basement pumps;
      (6)   Air conditioning condensation;
      (7)   Noncommercial vehicle washing;
      (8)   Natural flows from riparian habitats and wetlands;
      (9)   Dechlorinated swimming pool discharges;
      (10)   Flows from fire suppression activities, including fire hydrant flows;
      (11)   Waters not otherwise containing wastes as defined in Cal. Water Code § 13050(d) and Cal. Health and Safety Code § 25117;
      (12)   Diverted stream flows;
      (13)   Uncontaminated ground water infiltration to separate storm sewers;
      (14)   Any discharge, which the enforcement official, the local health officer, or the Regional Water Quality Control Board determines in writing is necessary for the protection of the public health and safety;
      (15)   Any discharge caused by flooding or other natural disaster, which could not have been reasonably foreseen or mitigated for in advance by the discharger, as determined by the enforcement official.
   (C)   Conditional exemptions from discharge prohibition consist of the following non-storm water discharges to the MS4 are exempt from the prohibition set forth in division (A) and may be allowed to be discharged into the MS4, subject to all appropriate BMPs and prior written authorization by the Director. The "conditionally exempt discharges" are as follows:
      (1)   De-chlorinated and non-salt water swimming pool discharges where the water cannot be readily discharged to the sanitary sewer system or allowed to completely percolate into the ground;
      (2)   Discharges from charity vehicle washing;
      (3)   Street, driveway, and sidewalk washing; and
      (4)   Other categories approved by the Executive Officer of the Regional Water Board, or an authorized representative.
(Ord. 2006-002, passed 3-13-06; Am. Ord. 2015-012, passed 6-23-15)