This management tool was designed to help local governments compare approximation costs and results from implementing a septic system nitrogen reduction program. This calculator will show you the results from three options: Septic-to-Sewer, Septic System Upgrades and Septic System Remediation Programs. We did our best to collect the most current and accepted information to produce a fair representation of the costs and results of implementing these programs. 


We did not include soils and underground water movement information. We found the inconsistencies in the results from the FDEP’s Nitrogen Source Inventory Loading Tool (NSILT) to be concerning, for example in the Wakulla spring area the DEP claims the 12,000-septic systems contribute 1.4 million lbs. of nitrogen a year to the springs, that is 116 lbs. N/yr. per household. That number is 93 lbs. N/yr. more than DEP has reported a household can generate (23 lbs. N/yr.). After all, Florida’s high-water tables, ground water, canals, rivers, streams, springs, aquafers, water ways, etc. that connect all our water resources makes the debate of one group of septic systems contaminating our waters more than the others seem inconsequential, as they all have the ability to effect our waters. 


The calculation was based on the following:


Household Nitrogen Load: 23 lbs. per household. 

U.S. Environmental Protection Agency (EPA) has reported a per capita contribution of 9.012 lb.-N/yr. (EPA 1992). 2017 Census 2.54 average people per household.


Septic Systen Nitrogen Reduction  50%:    

2018, Properly Functioning and Sited Septic System Wekiva-Area Septic Tank Study Assessment and Restoration Florida Department of Environmental: Division of Environmental Protection. 


Septic-to-Sewer:  

$30,000 per hookup


Septic System Upgrades: 

$22,500 per upgrade 


Transported Waste: 

Based on 18 years of collected pumping records from Carmody®