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 user with helpful information on understanding and complying with the requirements of the MS4 NPDES permit.

Impaired Waters & TMDLs

TMDL Requirements

The Florida Department of Environmental Protection's Division of Water Resource Management uses a comprehensive approach to protecting Florida water quality involving basin-wide assessments and the application of regulatory and non-regulatory strategies to reduce pollution. The Total Maximum Daily Load (TMDL) program is the heart of this comprehensive approach. (From the FDEP website.)

The PBC MS4 NPDES third term permit includes requirements for those permittees whose MS4s discharge to a water body segment that had an EPA-established or FDEP-adopted TMDL at the time the third term permit was issued (March 2, 2011). TMDLs established or adopted after March 2, 2011 will be addressed in the next permit cycle. Both FDEP and EPA refer to the water body segments and their associated contributing areas as WBIDs.

When the current permit was issued, there were no FDEP-adopted TMDLs, however, there were seven (7) EPA-established TMDLs in Palm Beach County.

Permittees affected by these EPA-established TMDLs are: Belle Glade, FDOT, Indian Trail Improvement District, Pahokee, potentially Palm Beach County, and South Bay. The permit's TMDL requirements include developing a schedule and an implementation plan to reduce the discharge of pollutants from each affected permittee's MS4 to the maximum extent practicable.

It is still important for all permittees to track TMDLs that are or will be established or adopted after the permit issuance date. The following table lists the TMDLs established or adopted after March 2, 2011. (These will be addressed in the next MS4 NPDES permit cycle.)

WBID Segment Name Basin Consitit-
TMDL Percent Reduction Date MS4's Agency TMDL Report Other Studies
3226C SW Fork Loxahatchee River St. Lucie/ Loxahatchee Fecal Coliform <43
91 5/16/2012 Jupiter, PBC, FDOT, SIRWCD, NPBCID DEP View Report Loxahatchee RAP
3262A Lake Ida Lake Worth Lagoon Nutrients TN=0.857 mg/l
TP=0.062 mg/l
11/9/2012 Boynton Beach, Delray, FDOT, PBC EPA View Report Boynton Inlet Contributing Area WMP
3264A E-1 Canal Lake Worth Lagoon Fecal Coliform <400
94 5/15/2012 PBC, FDOT DEP View Report Contributing Area

FDEP has a listing for site-specific TMDL prioritys and setting through 2022. Included on the list are eight waterbodies in Palm Beach County. One water body, Boynton Canal (WBID 3256B) was delisted in the Lake Worth Lagoon Cycle 3 2016 listing. Three other water bodies are included in a Reasonable Assurance Plan being coordinated by FDEP for the Loxahatchee River (North Fork WBID 3226D, NW Fork 3226A and SW Fork 3226C). These activities removed all four from the TMDL schedule resulting in three remaining water bodies as shown in the following table.

WBID Segment Name Basin Parameter MS4s
3245C4 Pine Lake Lake Worth Lagoon Nutrients Palm Beach County,
FDOT-District IV,
West Palm Beach
3248 New River Canal Everglades Nutrients South Bay,
FDOT District IV
3262A Lake Ida Lake Worth Lagoon Nutrients Palm Beach County,
Delray Beach,
Boynton Beach,
FDOT-District IV
3262B1 E-1 Lake Worth Lagoon Nutrients Palm Beach County,

Impaired Water Body Segments

Within Palm Beach County, both FDEP and EPA have identified impaired WBIDs. Both a map and a list of the impaired WBIDs (April 2017) are available.

An impaired WBID is a candidate for a TMDL, so it is important to keep track of impaired WBIDs to which your MS4 contributes.

FDEP’s assessment program for waterbody impairment divides the state’s waterbodies into 5 Groups, with each group cycling through a 5-year assessment cycle. The 5-year cycle includes planning, monitoring, preliminary evaluation, public meetings, final evaluation, and Secretarial (state) adoption of the verified lists. Within Palm Beach County there are four basin groups. The third assessment cycle began in 2012. Below is the assessment schedule that FDEP published in 2018.

Cycle RotationBasin GroupWatershedPlanning Data PeriodVerified Assessment Data PeriodAssessment Year
41Lake Okeechobee1/1/2006-12/31/20151/1/2011-6/30/20182019
42Loxahatchee River1/1/2007-12/31/20161/1/2012-6/30/20192020
43Lake Worth Lagoon1/1/2008-12/31/20171/1/2013-6/30/20202021

Additional Information

A number of presentations have been given on TMDLs throughout the state. The following list includes several that may be of interest. Click on the title to download a PDF of the presentation.
Implementing TMDLs, presented by Busby (9/11/11)
Implementing TMDLs, presented by Frick, (9/11/11)
Bacteria Pollution Control Plans, presented by Singleton, (9/11/11)

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