How much thought have you given to what you put down your drain? Everything that goes down your sink, toilet, or runs-off your property all goes to the same place, the waste water treatment plant. Lucky for us, we have facilities who filter through and treat all the gunk that people discard without a care and transform it into clean water.
In a small town a little over an hour south of the Kansas City metro is the Fort Scott Wastewater Treatment plant that does just this for Bourbon County, Kansas. They have processes in place that produce clear, treated water. They are then able to feed it back into the Marmaton River or sell for industrial applications. They even take the solid byproduct of the process, which is very nutrient dense, and use it to fertilize local farmland.