Any activity or event which results in a release, leak, flow, escape or the placement of any material other than rain water (including liquids or solids) into the storm drain system.

any nonpermitted disposal into the storm drain system.

Any non-stormwater flow either intentionally or inadvertently discharged to the County's storm drainage system. This does not include discharges authorized by an NPDES permit or discharges resulting from fire fighting activities.