We’ve installed and billed for many parks in Florida which has a county by county jurisdiction on water and waste water.
I attached some good info to have when buying parks in Florida.
Some counties will make you become a public utility or hire a water operator to bill your tenants.
This was helpful for me and now its yours. 
Cheers!
/Florida billing jursdiction county to county .pdf (242.7 KB)
psc jurdisictional and non jurisdictional counties .pdf (208.1 KB)