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.

Group/Joint Activities - Water Quality Monitoring

The water quality monitoring requirement in the MS4 NPDES permit is met through a joint program. The monitoring program includes the following components:

  • ambient water quality sampling
  • water quality data analysis
  • trend analyses
  • annual pollutant loading calculations in Permit Year 3

The Palm Beach County MS4 NPDES permit monitoring program includes 40 ambient water quality monitoring sites which were selected after coordination among the South Florida Water Management District (SFWMD), Palm Beach County Environmental Resource Management (ERM), the Loxahatchee River District (LRD), Broward County (BC), and the Palm Beach County permittees.

The Watershed Boundary Maps depicts the 40 water quality monitoring site locations. Sites monitored by ERM are shown as circles, those monitored by the LRD are shown as squares, those monitored by SFWMD are shown as triangles, and those monitored by BC are shown as stars. White symbols signify marine or tidal sites and yellow symbols designate freshwater sites. The LRD monitors four marine sites and three freshwater. ERM monitors ten marine sites and fifteen freshwater sites. The SFWMD monitors five freshwater sites and Broward County monitors one freshwater and two marine water sites. All of Palm Beach County’s ERM, LRD and BC is in WIN/STORET and SFWMD data is in DbHydro.

The data set for the trend analyses includes approximately 22 water quality parameters and all MS4 sampling events for each site’s period of record as identified in these Excel spreadsheets.

Water quality trends for 40 water quality monitoring sites (TN, TP, and Chl-a for the period of record) is graphed. The trend analyses are generally based on the annual geometric mean of all the monitoring site values within each watershed calculated on a calendar year (January 1 to December 31).

Chlorophyll-a graphs for the four Lake Worth Lagoon Central sites are based on the ten percent threshold criteria.

Reporting on the monitoring program and more detailed information is available in the Joint Annual Report, submitted with the permittees’ Annual Report Forms each year.

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