So how does the San Joaquin Valley’s water quality rate?  Not very well for drinking. Nitrate contamination is a very real concern.  What can you do?  Pretty simple, you can purchase a water filter and it doesn’t have to be expensive.  Most of the lower cost water filters will filter at least 60% of nitrates.  Is that enough for Stanislaus County water, to remain below the 10 ppm?  Here’s a report of not only water quantity, but quality for this part of the Valley created by Modesto Irrigation District – skip to pages 64 – 85 to determine what you should be doing.

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