The town sewage does not go into the lagoon. We have a somewhat effective sewer system, but most folks are not connected to it. That that is put in the system flows down to the low spot and the main intersection and then is pumped up into the holding tank and then is (if the pumps work) pumped up across the highway to a leach field.
For those folks who are not connected to the sewer, they have a septic tank and leach field. Leach fields work well if they are properly installed. They disperse the effluent into the soil and the microbes in the soil convert it to a beneficial additive. The water (the vast majority of the effluent) goes back into the water table and is filtered by the sand/soil.
As an example, many cities, especially in dryer areas, pump treated effluent into a large field and let it filter down and then pump it back up for the town's water supply.
When there is a lot of rain and the sewer system becomes a storm drain, there is water that comes out of the manhole near the crocs and goes into the lagoon. The fish LOVE it and line up by the 10s of thousands to feast on it, get fatter and then make the other fish, birds and crocs equally happy.
There have been test done re: the water quality of the beach area and there is very, very, very little (if any) conform bacteria.
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