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OVERVIEW
The Produce Safety Rule (PSR) requires growers to initially establish a Microbial Water Quality Profile (MWQP) for each untreated surface agricultural water source used during growing activities of covered produce (other than sprouts).
The PSR must be applied for each water source using a direct water application method and annual surveys must be conducted for that water source in subsequent years.
The water quality profile is based on the levels of generic E.
coli in your agricultural water.
The method of testing for generic E.
coli must be conducted following U.S.
Environmental Protection Agency (EPA) Method 1603.
Methods other than 1603 may be used but they must be scientifically valid and shown to be at least equivalent to EPA Method 1603 in accuracy, precision, and sensitivity.
Ag Water app was developed to:
• Assist growers with GM and STV calculations to determine if their water meets the criteria for appropriate application to produce before harvest
• Assist growers with making water management decisions if their water does not meet the criteria in the Produce Safety Rule
• Evaluate current sampling conditions for irrigation water quality to determine the probability of microbial contamination
Definitions:
Agricultural water is defined in part "as water that is intended to, or likely to, contact the harvestable portion of covered produce or food-contact surfaces."
Geometric mean (GM) : GM is essentially the average amount of generic E.
coli in your water source.
PSR criteria requires a GM at or below 126 E.
coli CFU/100ml.
Statistical threshold value (STV): STV is a measure of variability of generic E.
coli levels in your water source.
In simple terms, it is the level where 90 percent of the samples (log values) are below the value.
PSR requires an STV at or below 410 E.
coli CFU/100ml
CFU (colony forming units) is the estimate of bacterial concentration in your water per 100 ml.
More information on the Produce Safety Rule and agricultural water can be found here:

 

 

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