EPA certified water operator here; there’s a few things that go into this- the biggest one being the fact the earth has an extremely finite amount of freshwater, even more finite is the chance that the water is actually accessible and there year round(snow melt, rain seasons etc.) second most important is water demand, typically summer is the highest use months, and the wells have to run enough water through the treatment plant to keep the water towers filled to a certain level, if not water pressure will drop which can cause a very large host of issues. Structure fires are also more prevalent from late spring to late summer, so having a lot of available water for a fire flow is crucial. Lastly, when water hits the drain it goes to a wastewater plant, rural areas it will go to a septic tank/leech field. When you use water it does not return to its original place, likely it’s discharged to a river or stream after treatment. It takes exponentially more time for an aquifer or body of water to replace that freshwater than it does for us to use it.
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