Area guideMastic Beach
Water Damage Restoration Help in Mastic Beach, NY
Connect with a local specialist now.
The hamlet of Mastic Beach · Town of 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 Mastic Beach, 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.
- You call Tell us what you're seeing
- We connect you With a local specialist covering all of Mastic Beach
- They arrange A visit with you
Since 1978, federal flood insurance has paid $22.7 million on 1,037 claims in ZIP 11951, which takes in Mastic Beach, so water has reached homes here before.
Mastic Beach at a glanceTap a figure to see it on the map
Flood risk: Very HighFlood zone. 1,110 of the 5,411 addresses here are inside FEMA's mapped flood zone. 313 more are within about 100 ft of its edge.
If your home is in it, most mortgage lenders must require flood insurance. That is a separate policy from homeowner's insurance, which usually covers a burst pipe or leaking appliance.
The percentage above counts all developed land, including lawns, parks and roads, not just homes.
Each square is about 450 ft across. Color shows how many of its addresses are mapped inside the zone:
- Fewer than half
- Half or more
- All
Groundwater. At 4,392 of the 5,408 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 until the ground drains. The 1,016 measured deeper are the exception.
3 addresses fall where the groundwater map has no reading.
Each square is about 450 ft across. Color shows the typical depth under its addresses (USGS map, spring 2013):
- Within 10 ft2,797
- 10 to 14 ft1,595
- 14 to 25 ft1,016
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 Mastic Beach homes
Mastic Beach is in the area the county's Forge River sewer project is planned to reach in its later phases; until then its homes run on cesspools. Water reaches Mastic Beach homes from outside and from within. From outside, storm surge can push into streets and ground floors. Inside the house, the risks are a cesspool backing up, water rising through the basement floor and an aging pipe giving way.
- Water coming in from outside. After surge water recedes, anything porous it touched (drywall, insulation, carpet) normally comes out, and photos taken before cleanup make the flood claim easier. When a hurricane or a strong nor'easter hits, surge from Narrow Bay can reach homes across Mastic Beach, and 30.9% of its built-up land is in FEMA's flood zone. Look up your street. Storm Damage Restoration help
- Sewage coming up a drain. Keep children and pets away from sewage, and stop running water in the house until the line is clear, because every flush adds to what comes up. Homes in Mastic Beach treat their own wastewater in a cesspool or septic tank, so when the system is full, slow drains and gurgling pipes come before sewage in the lowest drain. Cesspool Overflow help in Mastic Beach
- Water in the basement. Pumping the water out is only half the job: the basement has to be dried and the source handled, usually with a sump pump or sealing, or the water comes back. In Mastic Beach, the water table is about 10 ft down, close enough to push water up through a basement floor, so a basement that has been pumped dry can fill again. Basement Flooding help in Mastic Beach
- A leak or a burst pipe. To check for a hidden leak, turn off every tap and watch the water meter; if it still moves, water is going somewhere it should not. About 49% of Mastic Beach'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. If a pipe bursts, shut the main water valve first; a split supply line keeps running at full pressure until someone does. 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 Mastic Beach
See how many of its addresses are mapped inside the FEMA flood zone and how deep groundwater is mapped under it.
164 streets, from county address records. Nothing you type is sent anywhere.
Streets inside the FEMA flood zone
1,110 of 5,411 address points in Mastic Beach are mapped inside a FEMA special flood hazard area. These streets hold the most of them:
- Riviera Dr — 66 of 68 addresses
- Shore Dr — 57 of 57 addresses
- Cranberry Dr — 44 of 82 addresses
- Edgewater Dr — 43 of 63 addresses
- Huntington Dr — 38 of 66 addresses
- Elm Rd E — 35 of 35 addresses
- Laurelton Dr — 34 of 82 addresses
- Diana Dr — 30 of 72 addresses
Quick facts — Mastic Beach
Flood and storm
- FEMA flood zone
- AE (100-yr floodplain)
- Hurricane evacuation zone
- Zone A Zones run A to E. A evacuates first.
- Hurricane Sandy high-water mark
- 6.5 ft The highest of 3 marks USGS surveyed in Mastic Beach after the 2012 storm, in feet above the NAVD88 datum — a reading at one point, not a level across all of Mastic Beach. Ground elevation here averages 13 ft on the same datum.
- Water nearby
-
Narrow Bay to the south, Moriches Bay to the east and Forge River to the north-east.
Each direction is to its nearest point, from the center of Mastic Beach.
All 11 named water features
- North: Poospatuck Creek
- North-east: Forge River, Home Creek, Lons Creek
- East: Moriches Bay, Lawrence Creek
- South: Narrow Bay, The Lagoon
- South-west: Pattersquash Creek, Sheepen Creek, Johns Neck Creek
In an emergency
- Nearest fire department
- Mastic Beach Fire Department
- Nearest emergency shelter
- Eastport-South Manor Jr./Sr. High 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
- 11951
Homes here
- Sewer status
- Unsewered (Cesspool/Septic)
- When homes were built
- Spread across decades The highlighted 1970s band is the largest, at 25%, but its lead over the 1950s band (16%) is inside the Census margin of error (9 points), so no decade clearly leads in Mastic Beach. Most homes here are over 30 years old. Past that age, an insurance-industry study (IBHS) found supply and drain pipe problems three times as likely.
Mastic Beach's land area
- FEMA coastal wave zone (VE)
- FEMA 100-year floodplain (AE)
- The flood-zone figure above says how much of the land these zones cover.
Sources: FEMA NFHL / NOAA SLOSH, US Census ACS, USDA SSURGO, Suffolk County records. Verified 2026-10-18. How we measured this.
Mastic Beach and nearby areas
Mastic Beach has the largest mapped floodplain share of the 5 areas compared here.
- Mastic Beach 30.9%
- Center Moriches 11.8%
- Moriches 7.7%
- Shirley 4.8%
- Mastic 2.2%
Share of developed area inside FEMA's mapped floodplain, largest first.
Mastic Beach has the shallowest average groundwater of the 5 areas compared here.
- Mastic Beach 10 ft
- Center Moriches 14 ft
- Moriches 19 ft
- Mastic 28 ft
- Shirley 35 ft
Average depth to groundwater, shallowest first.
Mastic Beach has the lowest average ground of the 5 areas compared here.
- Mastic Beach 13 ft
- Center Moriches 18 ft
- Moriches 25 ft
- Mastic 43 ft
- Shirley 44 ft
Average height above sea level, lowest first.
Mastic Beach measures 30.9% on flood-zone share, where its 4 neighbors average 6.6%. More of Mastic Beach's developed land is in a mapped flood zone than in the areas around it. Pre-1970 housing share separates it as well — 49%, against a 27% neighborhood average. Mastic Beach's housing stock is older than that of the areas around it.
Compared with the areas around Mastic Beach. How we measured them.
Frequently asked questions about Mastic Beach
Is Mastic Beach in a flood zone?
Mastic Beach's FEMA-mapped flood zone is AE (100-yr floodplain), covering about 30.9% of the developed area, per FEMA's flood map (NFHL).
Does Mastic Beach have public sewer, or cesspools?
Mastic Beach is unsewered — nearly every property runs on its own cesspool or septic system.
How old are homes in Mastic Beach?
The average home in Mastic Beach is about 55 years old, and 49% of the housing stock predates 1970 — older plumbing and unwaterproofed foundations are a common factor in local water damage.
Is Mastic Beach in a hurricane evacuation zone?
Mastic Beach falls in Suffolk County hurricane evacuation Zone A. Check the county's current maps before a named storm — zones are what county officials use when ordering evacuations.
About the figures for Mastic Beach
Check them at the source
Who to call for water damage in Mastic Beach
(631) 440-4144Tell us what is happening. We connect you with a local specialist who covers Mastic Beach.