Возможно неэффективность водоподготовки и «вторичное» загрязнение воды в коммунальных сетяхИсточник:
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https://xn--80aaaf9agbtgd4a3f4b.xn--p1ai/%d0%bf%d0%b8%d1%82%d1%8c%d0%b5%d0%b2%d0%b0%d1%8f-%d0%b2%d0%be%d0%b4%d0%b0-%d0%b2-%d0%ba%d0%b0%d1%87%d0%ba%d0%b0%d0%bd%d0%b0%d1%80%d0%b5-%d1%81%d1%82%d0%b0%d0%bb%d0%b0-%d1%85%d1%83%d0%b6%d0%b5/