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Spatial Analysis and Decision Assistance


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Spatial Analysis and Decision Assistance (SADA) is free software that incorporates tools from environmental assessment fields into an effective problem solving environment. These tools include integrated modules for visualization, geospatial analysis, statistical analysis, human health risk assessment, ecological risk assessment, cost/benefit analysis, sampling design, and decision analysis. The capabilities of SADA can be used independently or collectively to address site specific concerns when characterizing a contaminated site, assessing risk, determining the location of future samples, and when designing remedial action. A fully functional freeware version is available on the download page of this web site. SADA is developed in The Institute for Environmental Modelingat the University of Tennessee .

SADA is an evolving freeware product targeted to individuals performing environmental assessments in support of decision-making. The primary objective is to create a user friendly software package for environmental characterization and decision-making. This problem solving environment applies and integrates a number of algorithms that can either be used in a stand alone fashion or in the direct support of performing a site assessment. The software processes and produces information in a clear, transparent manner, directly supporting decision processes, and can serve as a communication tool between technical and non-technical audiences. The end result is that SADA can be used to facilitate decisions about a given site in a quick and cost effective manner. SADA has a strong emphasis on the spatial distribution of contaminant data and is therefore best suited for anyone who needs to look at data within a spatial context, such as: 

  • Statisticians 
  • Risk Assessors 
  • GIS Users 
  • Project Managers 
  • Stakeholders 
  • MARSSIM Analysts

Ultimately, our objective is to provide environmental assessors with a unified software package that links practical characterization tools to decision-making capabilities (particularly human health and ecological risk assessment). The integration of the human health risk capabilities of SADA with modules for ecological risk assessment can help accomplish EPA's mission as outlined in the Ecological Research Strategy to: "develop and demonstrate a multiple pathway, multiple chemical model that integrates human health and ecological cumulative exposure and risk assessments." In addition, using the same problem solving environment for human health and ecological risk assessment assures consistency between the two assessment efforts in terms of the data that is used and the decision rules that are addressed. Our intention is to maintain it as a free product that will not depend on other software products (other than Windows).



1.      SADA Friendly Regional Screening Levels for Chemical Contaminants at Superfund Sites

The SADA risk guys developed a SADA friendly file for the newest Regional Screening Levels for Chemical Contaminants at Superfund Sites (RSLs)! Download the RSLs .csv files first. Then use Setup Custom Analysis to import them and start using them in SADA right away. You can use them to do classic tabular screens of your data, do spatial screens, and of course use them as decision criteria for developing areas of concern if you like.

The link to them is on the SADA downloads page or you can link to them directly here (they are near the bottom).


2.      There is a new Toxicological Profiles Database here


3.      Don’t forget this SADA training course is coming up!

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