FSMA Produce Safety Rule

Online Calculator

Determining Your Microbial Water Quality Profile (MWQP) for Agricultural Water Used in the Production of Fresh Produce

Instructions for Microbial Water Quality Profile


Sample Date
Sample Location/ID
Colony Forming Units (CFU E. coli /100 ml)
Sample Stage

Table 1. Your Microbial Water Quality Profile (MWQP)

Table 2. Your MWQP Compared to the Produce Safety Rule (PSR)

CAUTION: Using fewer than 20 samples for GM and STV does not satisfy the requirements of the rule.

CAUTION: As specified by the FSMA PSR, samples contributing to your MWQP must be calculated over a minimum of 2 years, but not more than 4 years.

  E. coli
CFU/100 ml
Log E. coli
CFU/100 ml
E. coli
CFU/100 ml
Log E. coli
CFU/100 ml
PSR Criteria 126 2.10 410 2.61
Your MWQP Results

Important Notes

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You may print results directly or transfer them to an Excel spreadsheet. To transfer results to Excel: select all text on the Print Preview, copy the text, and paste the text from the clipboard into Excel.

Support Provided By

CPS Center for Produce Safety
Maricopa Agricultural Center
UCDavis - Western Center for Food Safety
University of Arizona - Cooperative Extension
University of California - Agriculture and Natural Resources
Univeristy of Arizona - Soil, Water and Environmental Science
Yuma Agricultural Center

For More Information, Please Email:

Channah Rock, PhD
Linda J. Harris, PhD