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Nitrogen Reduction

Passive Nitrogen Reduction Study


In 2008, the Florida Legislature directed the Department of Health to develop a tool box of cost-effective nitrogen reduction strategies for onsite sewage treatment and disposal systems (OSTDS). The project had two main areas of focus: development of passive nitrogen reduction technologies; and evaluation and prediction of the fate and transport of nitrogen from OSTDS. Objectives included:

  • Development of cost-effective, passive strategies for nitrogen reduction from onsite sewage systems
  • Characterization of nitrogen removal in the soil and shallow groundwater
  • Development of simple models to determine fate and transport of nitrogen from OSTDS in soil and groundwater

In January 2009, the Department in consultation with its Research Review and Advisory Committee (RRAC) contracted with a project team comprised of nationally recognized experts led by Hazen and Sawyer, P.C. The Department, and its RRAC, directed the Florida Onsite Sewage Nitrogen Reduction Strategies (FOSNRS) project, with participation from the Florida Department of Environmental Protection (DEP).

Current Status

As of December 2015, the contractor, in coordination with the RRAC, DEP, and the Department, has successfully completed the contractual work for this project. The Department has sumbitted the final Legislative report to the Governor, Speaker of the House, and President of the Senate on December 31, 2015.


The resulting contract (1.9 MB pdf), March 2010 amendment (2.6 MB pdf), October 2010 amendment (1.5 MB pdf), January 2012 amendment (2.7 MB pdf), January 2012 renewal (1.6 MB pdf), and January 2012 amendment to the renewal (2 MB pdf) split the study into five main tasks.

The task descriptions, deliverables, and status for all project deliverables are available for download. 

Task A:  Technology Evaluation for Field Testing: Review, Prioritization, and Development  

The list below shows highlights of the task deliverables.  

View all Task A deliverables

The following document contains site and system design drawings for the Nitrogen Study. This document is visual in nature and may not be accessible to screen readers. If you need assistance with the information contained in this document, please contact the Onsite Sewage Program office.

Task B:  Field Testing of Technologies and Cost Documentation

View all Task B Deliverables

Task C:  Evaluation of Nitrogen Reduction Provided by Soils and Shallow Groundwater  

View all Task C Deliverables

Task D:  Nitrogen Fate and Transport Modeling

View all Task D Deliverables

Task E:  Project Management, Coordination, and Meetings

View all Task E Deliverables

Progress Reports to Legislature

Public Education

Contact Us

Please contact the Onsite Sewage Program office with any questions or comments.

Last Modified:
June 9, 2021 - 9:06am

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