Cesspool Backing Up? What to Do Right Now (Long Island)

Short answer: Stop using water, keep everyone off any soft or sunken ground over the system, avoid touching the sewage, and call a licensed operator. If the yard is flooded, don't have the tank pumped until the ground drains. Once the sewage is out, disinfect with a bleach solution and let the area dry for at least 24 hours.

Last updated: November 2026. If anyone has fallen into a cesspool or the ground has collapsed, call 911.

Step by step

Stop sending water down the drains. Stop laundry, dishwashers, showers and flushing. EPA's advice when a system is flooded or saturated is to drastically reduce water use; the only way to relieve a backup is to use the system less.
Keep everyone off soft or sunken ground. Keep people, pets and vehicles away from the area over the cesspool or septic system, especially any depression or cracked cover. Don't open covers yourself; tanks can contain dangerous gases.
Avoid contact with sewage. EPA warns that backed-up sewage may contain harmful pathogens. Keep children and pets out of the area. Anyone cleaning should wear protective clothing such as long rubber gloves and a face splash shield.
Check whether the ground is flooded. If the yard over the system is flooded or saturated, don't have the tank pumped yet. EPA says pumping in saturated soil is at best temporary and can make a tank float or damage its pipes.
Call a licensed operator. Describe what backed up, where, since when, and whether it has rained heavily or the yard is flooded. Mention any sunken ground. In Suffolk the operator needs a Liquid Waste License; in Nassau, a Home Improvement License.
Clean and disinfect. After the sewage is removed, clean the area and disinfect it with a bleach solution (EPA: one part household bleach to nine parts water, or half a cup of bleach per gallon). Wash tools and clothing. Let the area dry completely for at least 24 hours before using it.
Find the cause before it repeats. A full cesspool, a clogged outlet, groundwater or a collapsed structure each lead to a different fix. In Suffolk, needing pumping four or more times a year for those reasons meets the county's failed-system definition.

Why it backed up

Full cesspool or tank. Pumping fixes it, for now. See how often to pump.
Saturated ground or high groundwater. After heavy rain the soil can't take more water. EPA: the system recovers as the water table drops; using less water helps.
Clogged outlet. Floodwater can lift the scum layer and block a septic tank's outlet tee; EPA suggests checking the tank outlet first if a system backs up after flooding.
Structural failure. A collapsed ring or cover. Suffolk's grant FAQ links old block cesspools to collapse risk; a confirmed structural failure moves you to replacement.

Private wells and I/A systems

If the home uses a private well, don't drink the water after a flood or backup until it's tested; contact the health department.
I/A systems have pumps and blowers: check electrical connections for damage before restoring power, and call your maintenance provider. Suffolk's FAQ says that if the power is out, the system works like a conventional septic system unless there's a backup generator.

How a ClickCesspool request works

Submit the request with your address and what's happening. A team member reviews it and matches it to an independent, licensed operator serving that address, who contacts you to confirm the time window and price. We don't publish a guaranteed arrival time because it depends on the operator's schedule that day.

Frequently asked questions

Should I get my cesspool pumped if the yard is flooded?

Not while the ground is saturated. EPA says pumping during flooded or saturated conditions is at best a temporary fix and can make a tank try to float out of the ground or damage the pipes. Cut water use until the ground drains, then have it pumped and inspected.

Is sewage backup in the basement dangerous?

It can carry harmful pathogens. EPA advises avoiding contact, wearing protective gear for cleanup, disinfecting with a bleach solution and letting the area dry for at least 24 hours. If anyone uses a private well, don't drink the water until it's tested.

How fast can someone come out?

ClickCesspool matches your request to an independent licensed operator who serves your address; that operator confirms the arrival window and price with you directly. We don't promise a response time we can't guarantee.

Sources

Each source was re-read on November 7, 2026. Program amounts and rules change; the agency page is the authority.

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