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.

Any disposal into the storm drain system for which a person or business does not have a permit.

The release or placement of any material into the County stormwater conveyance system which is not authorized by the County.