How to assess water quality risks

From Michigan State University Extension:

In most cases, water is essential to fresh produce growing. The quality of the water used in growing the crop and the systems used to convey it are determining factors to providing safe, wholesome produce. The sheer number of factors that can compromise water quality can make it difficult to assess risk.

It is helpful to divide the risks up both by points in the system where the contamination can occur as well as by contamination type, such as biological or chemical. Contamination can occur either at the source, within the conveyance or at the point of emission.

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