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St. Johns County · A mound on a beach lot
St. Augustine Beach septic service when the water table leaves no room
On the barrier island south of the inlet, the wet-season water table can sit close enough to the surface that a conventional drain field cannot be permitted at all, and the answer is a mound.
St. Augustine Beach at a glance
- County
- St. Johns County
- Well permits
- Florida Department of Health in St. Johns County
- Septic permits
- St. Johns County environmental health office
- Wells here
- brackish sand and a shallow zone that cannot be trusted
Water in
Wells in St. Augustine Beach: brackish sand and a shallow zone that cannot be trusted
On the barrier island the shallow zone is a thin lens of fresh water floating on salt, and an irrigation well that pulls too hard draws the salt up. Sprinklers then spray brine on the lawn. Irrigation wells here are sized cautiously, tested for conductivity, and drilled deeper than the beach sand where the lens is too thin.
Every control box, switch and wire on the island lives in salt air, and equipment fails years ahead of the mainland. The pressure switch is the first suspect on a beach well that has stopped.
Waste out
What septic systems in St. Augustine Beach are actually up against
A drain field needs unsaturated soil beneath it to do its work, and the rule sets a minimum separation between the bottom of the trenches and the seasonal high water table. On much of St. Augustine Beach that separation does not exist in the natural ground. A replacement system here is therefore often a mound: imported sand built up above grade, with the field inside it and a pump lifting effluent up from the tank.
That changes the whole job. A mound has a dosing pump and a float and an alarm, which means it has electrical components in salt air. It has a shape the lot has to accommodate. And it has a design that comes from a site evaluation and a survey of the water table, not from a catalogue.
Call Flamingo does the evaluation before the quote, so the first number you hear is for the system the county will actually permit.
Well and septic work scheduled across St. Johns County
Wells and pumps in St. Augustine Beach
Permits and paperwork in St. Johns County
St. Johns County permitting runs through the county health department for both the septic system and the well, and on coastal parcels the separation between the bottom of the drain field and the wet season water table is the number that decides whether a conventional system fits or a mound design is required. Who issues what in St. Johns County.
Straight answers
St. Augustine Beach well and septic questions
Can a well on the beach turn salty?
Yes, if it draws harder than the freshwater lens can supply. Sizing the pump to the lot and testing for salt before drilling prevents it.
Why does the beach need a mound system?
Because the water table is too close to the surface for a buried drain field to have the required unsaturated soil beneath it. The mound builds that soil above grade.
Does a mound need more maintenance?
It has a pump, a float and an alarm that a gravity system does not, and near the ocean those get checked on every pump-out.
Well and septic service in St. Augustine Beach
Free estimates and seven-day scheduling, from a family-owned crew working out of Jacksonville.