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WQStat Plus is no longer available for purchase. We are encouraging our WQStat Plus users to upgrade to the Sanitas package, which will continue to be maintained and kept up-to-date with statistical guidance. We are offering substantial discounts to former WQStat Plus users.

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Overview Features Demo Purchase

WQStat Plus™ has been developed with assistance from Colorado State University faculty, the original developers of WQStat II. A subset of the state-of-the-art Sanitas package, WQStat Plus™ is designed to provide statistical solutions for various types of environmental media (e.g. surface water, groundwater, etc.). This powerful reporting and analysis tool is provided in a Windows-based environment.

WQStat™ is designed for the more experienced user who is familiar with the underlying assumptions of statistical methods, and it provides distributional pre-tests but does not automate them. It is also an ideal statistical software program for projects requiring a small volume of statistical analyses.

For instance, in deciding whether to construct a nonparametric or a parametric test, WQStat™ (unlike our Sanitas™ package) requires the user to manually test each data set for normality, and construct a statistical test based on those results. Plots are generated in single-plot format, and printed in the same manner. Sanitas's Summary Tables and Batch report features are not available in WQStat Plus™.

The other key difference between the two programs is their software licensing. Sanitas™ is licensed on a per-facility basis requiring a site license for each facility (and no restrictions on the number of users). WQStat Plus™ is licensed per-user, allowing one installation per software purchase.


  • Summary Statistics - Time Series, Multiple Constituent Time Series, Box & Whiskers (Seasonal & Annual), Outlier Test, Histogram, Rank Von Neumann, Seasonality, Chi Squared Goodness of Fit test for normality, Shapiro-Wilk/Shapiro-Francia Test for normality.

  • Trend Analysis - Linear Regression, Sen's Slope/Kendall Tau, Seasonal Kendall, Shewhart-CUSUM Control Chart.
  • Mean/Median Analysis - Mann-Whitney Test, Parametric and Non-Parametric ANOVA.

  • Excursion Analysis - Parametric and Non-Parametric Tolerance Interval, Parametric and Non-Parametric Tolerance Limit, Parametric and Non-Parametric Confidence Interval, Parametric and Non-Parametric Prediction Limit.
System Requirements WQStat Plus Users
  • Operating System: Windows 2000 Service Pack 3; Windows 98; Windows 98 Second Edition; Windows ME; Windows Server 2003; Windows XP Service Pack 2; Windows Vista; Windows 7; Windows 8 or 8.1.
  • Required Software: Microsoft .NET Framework v.2.0 (you will be prompted to download this free Windows component if it is needed); Internet Explorer 4.0 or later for Help system.
  • Disk Space: 50MB for WQStat Plus, and up to 600MB for the Microsoft .NET Framework, depending on system.
  • Environmental Consultants, water quality engineers, and city, state and federal agencies use WQStat Plus™ to assist them in analyzing environmental data.
WQStat Plus offers a suite of descriptive statistical tests to help you focus further analyses.

  w.q. stat plus screen

plot sample chart

WQStat Plus offers the Seasonal Kendall Trend Test.
kendall trend test chart


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