Area guideRonkonkoma
Water Damage Restoration Help in Ronkonkoma, NY
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The hamlet of Ronkonkoma · Towns of Islip and Brookhaven
Water in the basement, a burst pipe, or sewage backing up into the house? Call and we'll connect you with a local specialist who covers Ronkonkoma, even if you don't know the cause yet.
Water doesn't stay where it lands. It soaks into drywall, insulation and flooring, and mold can start within 24 to 48 hours.
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None of the 5,928 addresses in Ronkonkoma is in FEMA's flood zone, so the water that damages homes here usually comes from their own pipes and drains, not from a flood.
Ronkonkoma at a glanceTap a figure to see it on the map
Flood risk: LowFlood zone. None of the 5,928 addresses here is inside FEMA's mapped flood zone or within about 100 ft of it.
Groundwater. At 613 of the 5,928 addresses measured here, groundwater is within 14 ft of the surface, close enough to reach a basement floor.
In those basements, water can seep up through the floor and come back after pumping. At the other 5,315, water in a basement usually comes in from above.
Each square is about 600 ft across. Color shows the typical depth under its addresses (USGS map, spring 2013):
- Within 10 ft301
- 10 to 14 ft312
- 14 to 25 ft368
- Deeper than 25 ft4,947
Sewer. 73 of the 5,928 addresses in Ronkonkoma have a county sewer main mapped past them. That does not mean every house is connected.
At the other 5,855, a backup means a cesspool or septic tank, and a pumping company. On a main, it means a plumber, or the sewer district if the main is blocked.
Each square is about 600 ft across. Color shows how many of its addresses have a mapped main:
- Fewer than half
- Half or more
- All
What is happening at your home?
Other water emergencies we cover
Not sure which one fits? Call (631) 440-4144 and tell us what you see.
Why water gets into Ronkonkoma homes
Ronkonkoma sits entirely outside FEMA's flood zone. What damages homes here is closer to home: a cesspool backing up, water getting into the basement and old plumbing leaking inside the walls.
- Sewage coming up a drain. Standard homeowners policies usually exclude sewage backup unless a water-backup endorsement was added, so check yours and photograph the damage before cleanup starts. At 5,855 of the 5,928 addresses in Ronkonkoma, wastewater goes to a cesspool or septic tank because no sewer main is mapped past them, so a full or failing system can push sewage back into the house. Cesspool Overflow help in Ronkonkoma
- Water in the basement. A sump pump with a battery backup keeps running when a storm cuts the power, which is when the ground is wettest. The 37 ft average hides a spread: on some Ronkonkoma streets groundwater comes close enough to a basement floor to seep in after a wet spell. Basement Flooding help in Ronkonkoma
- A leak or a burst pipe. Mold can start on wet drywall within a day or two, so a slow leak needs the wall opened and dried, not just the pipe fixed. About 49% of Ronkonkoma's homes were built before 1970, and pipes from that era, galvanized steel and cast iron, corrode from the inside until a joint or a section gives way. Find the main shutoff before winter, because when a pipe bursts the first minutes decide how much of the house gets wet. Ceiling & Roof Leak Water Damage help
Insurance and safety guidance from FEMA FloodSmart, the CDC and the Red Cross. How we measured the figures.
Street by street in Ronkonkoma
See how many of its addresses are mapped inside the FEMA flood zone, how deep groundwater is mapped under it, and whether a sewer main is mapped past it.
199 streets, from county address records. Nothing you type is sent anywhere.
Streets with a mapped sewer main
County records map an active sewer main past 73 of 5,928 address points in Ronkonkoma. On 1 street nearly every address has one; the largest:
- Ricky Rd — 17 addresses
Quick facts — Ronkonkoma
Flood and storm
- FEMA flood zone
- X (minimal)
- Water nearby
- Lake Ronkonkoma to the north and Connetquot Brook to the west. Each direction is to its nearest point, from the center of Ronkonkoma.
In an emergency
- Nearest fire department
- Lakeland Fire Department
- Nearest emergency shelter
- Seneca Middle SchoolNot every shelter opens for every storm, and the nearest may stay closed. Suffolk County announces which ones open; follow its alerts and local news before you go.
- ZIP code
- 11779
Homes here
- Sewer status
- Unsewered (Cesspool/Septic)
- Home heating fuel
- 63% fuel oil Utility gas heats 26% of occupied homes in Ronkonkoma. Census estimates; the oil figure is within 6 points. Most homes here have an oil tank. In a flood, a tank can float or tip and spill. That is a separate cleanup from the water (NYS DEC). In a cold snap, an empty tank means no heat.
- When homes were built
- 1970s 34% of Ronkonkoma's homes were built in the 1970s, more than in any other decade band. Census estimate, within 4 points. Homes from the 1970s are about 50 years old. Past 30 years, an insurance-industry study (IBHS) found supply and drain pipe problems three times as likely.
Sources: FEMA NFHL / NOAA SLOSH, US Census ACS, USDA SSURGO, Suffolk County records. Verified 2026-10-18. How we measured this.
Ronkonkoma and nearby areas
All 6 areas compared here have the same mapped floodplain share.
- Bohemia 0.0%
- Ronkonkoma 0.0%
- Islandia 0.0%
- Lake Grove 0.0%
- Lake Ronkonkoma 0.0%
- Nesconset 0.0%
Share of developed area inside FEMA's mapped floodplain, largest first.
1 of the other 5 areas compared here has shallower average groundwater than Ronkonkoma.
- Bohemia 31 ft
- Ronkonkoma 37 ft
- Lake Grove 46 ft
- Nesconset 50 ft
- Islandia 66 ft
- Lake Ronkonkoma 69 ft
Average depth to groundwater, shallowest first.
1 of the other 5 areas compared here has lower average ground than Ronkonkoma.
- Bohemia 59 ft
- Ronkonkoma 78 ft
- Islandia 103 ft
- Lake Grove 108 ft
- Nesconset 109 ft
- Lake Ronkonkoma 120 ft
Average height above sea level, lowest first.
Ronkonkoma sits close to its surroundings here: 78 ft ground elevation against a 100 ft average across the 5 neighboring areas.
Compared with the areas around Ronkonkoma. How we measured them.
Frequently asked questions about Ronkonkoma
Is Ronkonkoma in a flood zone?
Ronkonkoma has no developed land inside a FEMA special flood hazard area, per FEMA's flood map (NFHL). The flood map describes surface flooding only, so it says nothing about groundwater, sewer or plumbing failures.
Does Ronkonkoma have public sewer, or cesspools?
Ronkonkoma is unsewered — nearly every property runs on its own cesspool or septic system.
How old are homes in Ronkonkoma?
The average home in Ronkonkoma is about 56 years old, and 49% of the housing stock predates 1970 — older plumbing and unwaterproofed foundations are a common factor in local water damage.
Where is the nearest emergency shelter to Ronkonkoma?
The closest Suffolk County emergency shelter to Ronkonkoma is Seneca Middle School. Shelter openings vary by storm — confirm with Suffolk County OEM before traveling to one.
About the figures for Ronkonkoma
Check them at the source
Who to call for water damage in Ronkonkoma
(631) 440-4144Tell us what is happening. We connect you with a local specialist who covers Ronkonkoma.