I don't know who did your tests but the results don't 'feel' right to me. You have half the acceptable MCL of 1 ppm of nitrites and yet no nitrates. You have a pH of 9 and less than 1 gpg of hardness, no iron.... no TDS, sulfates or chlorides test results. I've done a lot of water testing and that's odd water test results.
Your pH is above the acceptable range of 6.5-8.5.
There are many other potential causes of discolored water than tannins.
Gary Slusser
22 yrs in water treatment and well pumps, 13 yrs helping people on the 'net to help themselves.
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