Wetlands are a great use of water that hasn't been purified to drinking quality. Apart from the aesthetic value, it reduces the amount of process water that has to be discharged to the municipal system. Less water for the municipal system to deal with and lower cost for the companies because sanitary permits aren't cheap.

Distributing the non-potable water for uses like fire fighting, irrigation and industrial processes that don't require a high degree of purity could seriously reduce the strain on water supplies. The capital costs would be high but it would be a great investment in the long run.

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(nerd humor.)