The Rockaways Flood Exposure · NYC DEP Separate Storm Sewer Area
The Rockaways, Queens - MS4 Area
Properties here drain through separate storm sewers: rain runs in its own pipes straight to Jamaica Bay and Rockaway Inlet, apart from the sewage. When a storm drops rain faster than the catch basins can take it in, the water collects on streets and low lots instead. Here’s what that looks like for The Rockaways, Queens specifically.
11,447 properties in The Rockaways, Queens drain through separate storm sewers to Jamaica Bay and Rockaway Inlet. Flood Form rates 45% of them Moderate or High for stormwater, 23% for sewer backup, 88% for groundwater, and 89% for coastal flooding. 82% of lots have yard area that legally qualifies for on-site infiltration. The ground is fairly level here, typically about 7 ft. The median building dates to 1945. 2% of parcels sit over a historic stream or pond. Their runoff reaches the water through 44 NYC DEP storm sewer outfalls. NYC DEP lists floatables, pathogens, and nitrogen as pollutants of concern in these waters under its MS4 stormwater permit.
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Flood exposure in The Rockaways (Jamaica Bay & Rockaway Inlet)
The share of properties Flood Form rates Moderate or High for each type of flooding, on the same Minimal to High scale as an individual report.
45%
Stormwater exposure: Moderate or High
23%
Sewer Backup exposure: Moderate or High
88%
Groundwater exposure: Moderate or High
89%
Coastal exposure: Moderate or High
What sets The Rockaways (Jamaica Bay & Rockaway Inlet) apart
The three figures on which this area differs most from the rest of NYC’s separate storm sewer areas.
7 ft
Median ground elevation
The lowest of NYC's separate storm sewer areas. Low-lying ground, where water collects and drains slowly.
89%
Properties with Moderate or High coastal exposure
Higher than 95% of NYC's separate storm sewer areas. More lots here are within reach of tides and storm surge.
88%
Properties with Moderate or High groundwater exposure
Higher than 90% of NYC's separate storm sewer areas. A shallow water table sits under more lots here.
Stats computed from Flood Form’s NYC parcel data as of October 28, 2026
Where The Rockaways’s storm sewers drain
The waters NYC DEP maps this area’s storm sewer outfalls to, by number of properties.
3,830
Grass Hassock Channel
3,245
Rockaway Inlet
1,111
Broad Channel
926
Vernam Basin
544
Sommerville Basin
243
Barbadoes Basin
147
Conch Basin
133
Atlantic Ocean Coastline
125
East Rockaway Inlet
Common solutions for The Rockaways properties
The measures that most often suit conditions here. An individual Flood Form picks the exact set for one lot. See all flood prevention solutions.
Downspout Diversion
Redirect roof downspouts away from the sewer system toward permeable yard areas, planters, or a rain barrel.
Complexity: Low · 1–4 weeks
Raised Threshold
Raising a doorway threshold with a concrete step or raised sill keeps shallow surface water from entering at ground-level and below-grade doors.
Complexity: Low · 1–2 weeks
Window Well
A lined enclosure around a below-grade basement window holds back soil and keeps surface water off the glass.
Complexity: Low · 1–2 weeks
Foundation Waterproofing
Exterior membrane waterproofing, interior footing drains, or crystalline waterproofing compounds address hydrostatic pressure against the foundation, depending on construction type.
Complexity: High · 3–6 months
Sump Pump
A sump pump with battery backup actively removes water that accumulates in below-grade spaces during groundwater rise or sewer surcharge events.
Complexity: Low · 1–4 weeks
Modular Drywell System
An NDS Flo-Well modular drywell system lets water soak into the ground on-site.
Complexity: Moderate · 1–3 weeks
Which of these fit your lot?
Your Flood Form rates your property’s exposure and recommends the measures suited to it.
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Questions about flooding in The Rockaways (Jamaica Bay & Rockaway Inlet)
What does it mean that The Rockaways has separate storm sewers?
This part of The Rockaways, Queens is served by a separate storm sewer system, which NYC DEP calls an MS4. Catch basins and roof drains carry rain in their own pipes straight to Jamaica Bay and Rockaway Inlet, while wastewater flows in another pipe to a treatment plant. Because rain doesn't share a pipe with sewage here, a storm is less likely to push sewage back into basements than in combined-sewer neighborhoods, though a blocked or undersized house sewer line can still back up. Flooding here mostly comes from runoff the storm drains can't take in fast enough, and from groundwater and tides.
How exposed to flooding is The Rockaways (Jamaica Bay & Rockaway Inlet)?
The most widespread exposure in The Rockaways is coastal flooding: Flood Form rates 89% of properties Moderate or High for it. The share is 45% for stormwater, 23% for sewer backup and 88% for groundwater. These figures describe the whole area, and exposure varies lot by lot within it.
Can properties in The Rockaways (Jamaica Bay & Rockaway Inlet) manage stormwater on site?
82% of lots in The Rockaways have yard area that legally qualifies for on-site infiltration, such as a drywell or rain garden. A lot without that room can still hold runoff with a detention tank or a blue roof.
Why does runoff from The Rockaways matter for Jamaica Bay and Rockaway Inlet?
Storm sewers here discharge runoff without treatment, so what washes off streets, roofs and yards ends up in Jamaica Bay and Rockaway Inlet. NYC DEP lists floatables, pathogens, and nitrogen as pollutants of concern in these waters under its MS4 stormwater permit. Holding roof runoff on site with a rain garden, drywell, or detention tank cuts flooding on the property and what reaches the water.
How do I check one property in The Rockaways (Jamaica Bay & Rockaway Inlet)?
Enter the address on this page to get its free Flood Form. The report rates that property for stormwater, sewer backup, groundwater, and coastal flooding, and recommends measures suited to the lot.
Nearby separate storm sewer areas
- Shellbank & Hawtree BasinsHoward Beach5,067 properties · 52% with Moderate or High stormwater exposure
- Hook Creek & Head of BayRosedale & Springfield Gardens8,449 properties · 39% with Moderate or High stormwater exposure
- Fresh Creek & Hendrix CreekEast Canarsie & Starrett City5,116 properties · 48% with Moderate or High stormwater exposure
- Paerdegat BasinCanarsie & Bergen Beach3,164 properties · 57% with Moderate or High stormwater exposure
- Mill BasinMarine Park & Mill Basin10,396 properties · 56% with Moderate or High stormwater exposure
- Bergen BasinSt. Albans & South Jamaica41,298 properties · 44% with Moderate or High stormwater exposure