You’d be surprised how inaccurate this is in many cases. Drilled wells are sealed off from surface water, like the water from your septic, by design.
The amount of time it takes from surface water to reach deep well aquifers can be significant, decades, and the water from your septic may not even be go anywhere near your well, it could be entering a deep well aquifer miles away.
The science has been rather conclusive even in areas that have plentiful aquifers we are depleting them at rates higher than their replenishment rates. It could be a rather significant time frame before it impacts many people but it is happening. If a 500ft well is losing a 1/2inch a year and started with a static level of 25 feet, it’s going to be a rather long time before that well is impacted in any meaningful way.
I’m in New England. We have no shortage of water overall. My experience is in line with the scientific studies. However the older 100ft wells are seeing reduced yields as the aquifers are seeing more use and suffering from depletion. I have long histories on many wells, my grandfather was on board with drilled wells in the 50’s. I regularly get to inform people their wells that were historically solid producers have tapered off and can no longer off meet their needs, they need to re-drill. Not really the type on news people are looking for. Where a 100ft well was fine in the 50’s a 200ft well might be required today for a similar yield. Rarely will I stop drilling before I hit 300, it’s part of calculating an expected loss.
Stranger On A Train’s point is very accurate. Typical household use is a drop in the bucket compared to industrial use or irrigation. Running one sprinkler zone for 15 minutes uses more water than a typical person will use in an entire day. The amount of money and water people put into green grass is rather amazing.
Even if the loss of water is insignificant in the grand scheme of things, it doesn’t hurt to be a little more conservative with our resources. Saving a gallon of water while brushing your teeth doesn’t hurt you. Turn off the faucet if you aren’t using it.