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[–] qwop 0 points 2 points (+2|-0) ago  (edited ago)

There could be a lot of factors at play with your garden, but Mike Adams has been testing drinking water for free for consumers for a while now (EPAWatch.org), and he keeps finding heavy metal contamination all over the US. Therefore if you're using unfiltered city water it seems that you are playing water lottery. In addition to fluoride, which binds aggressively to calcium both in soil and in humans, there doesn't seem to be any guarantee that the water will be free of any other contaminants either.

So could it be the contaminants in city water? Yes, it could be. Could it be the well water is hard water (water containing high amounts of minerals, which plants like)? Yes, it could be that too. It could be both.

You can buy a water TDS (Total Dissolved Solids) meter of eBay for a few bucks. That will give you some idea of the mineral content of your well water, if you want to go slightly more scientific on it.

Good pure spring water will have a TDS below 10. That's almost like distilled water. Well water can have anything above 100 up to 1000 even. City water usually hovers around 100. The higher the TDS of the water, the more minerals it contains.