MPN Calculator for IDEXX Quanti-Tray®/2000

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With our software, MPN Calculator 3.1, labratory researchers and water quality professionals can simplify the process of finding the MPN/100ml.  IDEXX provides a two- page table for this purpose, but our software makes this much easier.

At PUR we test, among other water quality parameters, the amount of coliform and E. coli in water samples.  To do this, the IDEXX Quanti-Tray®/2000 is filled with a water sample which has been mixed with chemicals providing the bacteria with food and an indicator.  After incubating for 24 hours we determine the amount of coliform bacteria present by how many wells, in the tray, turn yellow.  The amount of E. colipresent is determined by counting the cells that glow under a black light.  You can see these glowing cells in the photo.  

The MPN Calculator is also available as an online tool!  Because of PUR's partnership with Oregon State University, the MPN Calculator is now available as an online tool, with no need for download.  

Windows: Go to the download page

Web Application: Visit the Oregon Explorer

Windows Mobile: Contact Us


To find help for any issue you may be having with our software, please feel free to e-mail us at  and we will respond in a timely manner.

Legal Disclaimer

The IDEXX Quanti-Tray®/2000 MPN Table, used to create this program, is a product of IDEXX Laboratories, Inc. IDEXX Laboratories, Inc. in no way endorses or recommends this product's use.   Partnership for the Umpqua Rivers has no affiliation or relation with IDEXX Laboratories.

This program is provided for informational purposes only.  While this software has been checked for accuracy no guarantees are expressed or implied.  The MPN Calculator is provided as is.  Partnership for the Umpqua Rivers cannot accept any responsibility for errors or omissions in the software.