I live in a small town that spent a lot of money a few years ago on new infrastructure - water, sewer, storm drainage, road...
A couple months ago, they checked everyone's home to make sure no one was pumping basement sump pumps into sewer. I asked the Mayor what was going on, and they said the water coming back in the sewer is 20% more in volume than the water going out. They said the most obvious reasons for that are old meters reading flow rates low or extra water pumped backed in. The cost of new meters and installation is rather high, but I expect we will probably get them in the next couple years.
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