Why Drains Back Up During the Florida Rainy Season
The wet season here has a calendar. When the water table rises, a line that was already weak often shows it first in the lowest shower or tub.
Summer storms and a line that suddenly can't keep up
On the Treasure Coast and the Space Coast, the wet season is a real, measured pattern, not a marketing phrase. The National Weather Service office in Melbourne tracks wet- and dry-season dates for this area. The median wet-season start is May 28 and the median dry-season start is October 17. The heavier rain is usually packed into the summer months, often as afternoon storms.
That is also when we hear from homeowners whose lowest shower starts to gurgle, whose toilet bubbles when the washing machine drains, or whose yard smells after a week of daily storms. The rain is not always the whole story. It often reveals a line that was already in trouble.
What actually changes in the wet season
Indian River County, in its septic-to-sewer program materials, notes that the county has sandy soils and seasonal rainfall that cause groundwater tables to rise. When the water table is up, two things get harder:
- A septic drain field has less dry soil to work with, so a system that was "getting by" can start to back up into the house.
- A sewer lateral with cracked pipe, loose joints or root damage can let groundwater in. The line then has to carry your household waste plus extra water it was never meant to handle, and the lowest fixtures give out first.
Roots keep growing year-round here. After rain, soil shifts a little and a joint that was barely holding can open enough to catch paper and waste. That is why a line can be "fine all winter" and then fail in July.
What to do when it starts
- Stop adding water. No laundry, no dishwasher, no "test" flushes.
- Stay away from wastewater that has come up in a tub or onto a floor.
- Skip chemical drain cleaner. It rarely opens a main-line blockage and makes the work more hazardous.
- Call us at (772) 203-5437 and tell us which fixtures are affected and whether you're on septic or city sewer. Open Monday–Friday, 8 AM–6 PM. Emergency service may be available after hours, so call and ask.
We clear the line from a cleanout when there is one, using a cable machine and, when the pipe can handle it, hydro jetting. After the line is flowing, you can ask for a camera inspection to see whether the cause was a clog, roots, a sag or a break. For a minimal additional charge, we offer video camera inspection with obstruction locating. If the inspection leads to a repair you schedule with us within 30 days, we credit the inspection cost toward the repair.
See also sewer backups and sewer line repair. Town pages: Sebastian, Vero Beach, Fort Pierce, Palm Bay and Melbourne.
Rainy-season questions
Does heavy rain cause sewer backups?
Rain does not usually flood the sewer by itself in a sound house lateral. What we see more often is groundwater finding its way into a line that already has loose joints or cracks, or a line that was already running close to full. Roots and older clay or cast-iron pipe make that more likely. After a string of summer storms, a line that was only a little slow can start to back up into the lowest shower or tub.
What should I do if drains back up during a storm?
Stop adding water — no laundry, no dishwasher, no extra flushing. Keep people and pets away from wastewater that has come up. Don't pour chemical drain cleaner into a line that may already be full. Then call us and tell us which fixtures are affected and whether you're on septic or city sewer.
Is a backup after rain a septic problem or a plumbing problem?
It depends. A saturated drain field can keep a septic system from accepting water, and that is a septic-company job. A clog or a leaky lateral between the house and the tank, or a clog in a house that is already on city sewer, is often plumbing work. Tell us which system you have if you know.
Drains backing up after the storms?
Call (772) 203-5437. Tell us which fixtures are affected and whether you're on septic or city sewer.