skip to sub-navigation skip to content

It's a New Day in Public Health.

The Florida Department of Health works to protect, promote & improve the health of all people in Florida through integrated state, county, & community efforts.

skip to sub-navigation skip to content

Contact the Onsite Sewage Program


nitrogen logo

Legislative direction identified three areas of concern: 

(1) Quantification of life-cycle costs and cost-effectiveness of passive nitrogen reduction treatment technologies in comparison to more active technologies and to convention treatment systems; 

(2) Characterization of nitrogen removal from effluent in the soil underneath the drainfield and in shallow groundwater;  and

(3) Development of simple models to describe the fate and transport of nitrogen from onsite sewage treatment and disposal systems. 

The study contract was awarded on January 2009 to a Project Team led by Hazen and Sawyer, P.C., and was based upon an anticipated budget of $5 million over a 3-5 year project timeframe.

Back to Top

Current Status

Gulf Coast Research and Education Center test site

As of March 2014, the contractor, in coordination with the RRAC and DOH, has successfully completed parts of Tasks A, B, C, and D, including literature reviews; ranking of nitrogen reduction technologies for field testing; design and construction of a test facility for further development of passive technologies; development of quality assurance documents for the test facility work, groundwater monitoring, field testing, and nitrogen fate and transport modeling; installation of full-scale passive nitrogen reducing systems at seven home sites; completion of numerous sampling events of passive systems at the test facility and field sites; design and construction of a soil and groundwater test facility; and field sampling of the soil and groundwater under OSTDS at residential homes throughout Florida and at the test facility. 

Current efforts and work remaining includes: continuation and completion of field monitoring to determine the performance and cost of technologies at home sites. Studies of the fate and transport of nitrogen in the shallow groundwater; calibration and refinement of various nitrogen fate and transport models using field sampling results; and final reporting on all tasks with recommendations on onsite sewage nitrogen reduction strategies.

The latest status report was submitted in February 2014.

Back to Top


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:

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

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

Task C:  Evaluation of Nitrogen Reduction Provided by Soils and Shallow Groundwater 
Task D:  Nitrogen Fate and Transport Modeling   

Task E:  Project Management, Coordination, and Meetings

Back to Top


Back to Top

Contact Us

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

*Note: This page contains materials in the Portable Document Format (PDF). The free Adobe Reader may be required to view these files.

Back to Top