This website has been authorized by the Palm Beach County MS4 NPDES (PBC NPDES) Steering Committee as a resource for all permittees within the county. It is intended that this site will provide the permittee with helpful information on understanding and complying with the requirements of the MS4 NPDES permit.
Permit Component - Structural Controls
Structural Controls and Stormwater Collection System Operation and maintenance is the first listed permit program requirement. The intent is for the Permittee to operate and maintain its MS4 in a manner that reduces the discharge of pollutants to the receiving water bodies.
The Cycle 4 permit annual reporting requires an annual accounting of all structural controls owned/maintained by the Permittee. It further specifies a schedule (in the table below) for the inspection and maintenance of each type of control.
For those interested, SAIC compiled a description of stormwater structural controls.
| Structural Control | Inspection Frequency |
|---|---|
| Dry/Wet Retention/Detention Systems | Once every three years |
| Exfiltration Trench/French Drains | Once every three years |
| Grass Treatment Swales (Dry) | Once every three years |
| Underdrain Filter Systems | 18 months |
| Pollution Control Boxes | Quarterly, < or > |
| Pump Stations | Semi-annually or > |
| Major Outfalls, Canals | Annually, < or > |
| Pipes/Culverts, Ditches, Swales, Other Conveyances | 10% annually |
| Inlets, Catch Basins, Grates | 10% annually |