Regulations for the distance between water treatment plant and other buildings are there in order to limits complaint associated with odors. This regulation allows the cities to have less complaints. The odors are there some days and not there other days, so this is really a problem for someone who visits a house near a wastewater treatment plant who will not be aware that it smells bad if he visits the place on a good day for the seller. Sadly, some real estate developer often fights against those type of regulations.
By adding a small quantity of Archaea RNA microbes the associated smell from processing will be eliminated. Also because of their genetic code characteristics all pathogens and toxic metals are reduced into their elemental/nutritional form. Usually one 8oz cup is sufficient for WWTP tank of 300,000 gl.
Are you talking about the wellhead protection area delineations requiring 1000 foot buffer meaning you can't built any sewage system in that area. The 1000 foot buffer is to protect the watershed of the drinking water well area against contamination.