Madisonville's town government publishes water-quality reports for its own system. That is the right source for an account inside that system, but the 70447 postal area extends beyond a compact town core along the Tchefuncte. An address outside town limits may use another regulated system or a private well.
That boundary makes Madisonville a good example of why programmatic location pages need more than a ZIP list. The provider must be verified, the correct report attached, and private-well claims kept separate. If the concern is scale or staining, measure the relevant minerals. If it is a drinking-water target, define the contaminant or taste goal before choosing reverse osmosis or carbon.
For flood exposure, public customers follow the serving utility. A flooded private well should not return to normal use until the Louisiana Department of Health-aligned inspection, disinfection, and testing steps are complete.