Marine Park & Mill Basin Flood Exposure · NYC DEP Separate Storm Sewer Area
Marine Park & Mill Basin, Brooklyn - MS4 Area
Properties here drain through separate storm sewers: rain runs in its own pipes straight to Mill Basin, 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 Marine Park & Mill Basin, Brooklyn specifically.
10,396 properties in Marine Park & Mill Basin, Brooklyn drain through separate storm sewers to Mill Basin, which opens onto Jamaica Bay. Flood Form rates 56% of them Moderate or High for stormwater, 28% for sewer backup, 50% for groundwater, and 46% for coastal flooding. 93% of lots have yard area that legally qualifies for on-site infiltration. The ground is fairly level here, typically about 12 ft. The median building dates to 1940. 3% of parcels sit over a historic stream or pond. Their runoff reaches the water through 17 NYC DEP storm sewer outfalls. NYC DEP lists floatables as a pollutant of concern in these waters under its MS4 stormwater permit.
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Flood exposure in Marine Park & Mill Basin (Mill Basin)
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.
56%
Stormwater exposure: Moderate or High
28%
Sewer Backup exposure: Moderate or High
50%
Groundwater exposure: Moderate or High
46%
Coastal exposure: Moderate or High
What sets Marine Park & Mill Basin (Mill Basin) apart
The three figures on which this area differs most from the rest of NYC’s separate storm sewer areas.
8 ft
Elevation change from low to high ground
Flatter than 85% of NYC's separate storm sewer areas. Level ground, so runoff stays close to where it falls.
56%
Properties with Moderate or High stormwater exposure
Higher than 85% of NYC's separate storm sewer areas. Heavy rain ponds on or flows across more lots here.
1940
Median year built
Older than 80% of NYC's separate storm sewer areas. Buildings of this age tend to have aging drains and sewer connections.
Stats computed from Flood Form’s NYC parcel data as of October 28, 2026
Where Marine Park & Mill Basin’s storm sewers drain
The waters NYC DEP maps this area’s storm sewer outfalls to, by number of properties.
7,741
Mill Basin
2,636
East Mill Basin
19
Mill Basin and Tidal Tributaries
Common solutions for Marine Park & Mill Basin 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
Modular Drywell System
An NDS Flo-Well modular drywell system lets water soak into the ground on-site.
Complexity: Moderate · 1–3 weeks
Rain Garden
A shallow planted depression that collects runoff from roofs and paved areas and lets it soak into the ground over a day or two.
Complexity: Low · 1–3 weeks
Area Drain
A yard area drain — a surface inlet at the lowest point in the yard — provides a direct outlet for stormwater that pools on the site.
Complexity: Low · 1–4 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
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 Marine Park & Mill Basin (Mill Basin)
What does it mean that Marine Park & Mill Basin has separate storm sewers?
This part of Marine Park & Mill Basin, Brooklyn 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 Mill Basin, which opens onto Jamaica Bay, 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 Marine Park & Mill Basin (Mill Basin)?
The most widespread exposure in Marine Park & Mill Basin is stormwater: Flood Form rates 56% of properties Moderate or High for it. The share is 28% for sewer backup, 50% for groundwater and 46% for coastal flooding. These figures describe the whole area, and exposure varies lot by lot within it.
Can properties in Marine Park & Mill Basin (Mill Basin) manage stormwater on site?
93% of lots in Marine Park & Mill Basin 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 Marine Park & Mill Basin matter for Mill Basin?
Storm sewers here discharge runoff without treatment, so what washes off streets, roofs and yards ends up in Mill Basin. NYC DEP lists floatables as a pollutant 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 Marine Park & Mill Basin (Mill Basin)?
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
- Paerdegat BasinCanarsie & Bergen Beach3,164 properties · 57% with Moderate or High stormwater exposure
- Sheepshead Bay & Gerritsen CreekSheepshead Bay & Madison19,430 properties · 57% with Moderate or High stormwater exposure
- Fresh Creek & Hendrix CreekEast Canarsie & Starrett City5,116 properties · 48% with Moderate or High stormwater exposure
- Coney Island Creek & Gravesend BayConey Island & Gravesend7,412 properties · 62% with Moderate or High stormwater exposure
- Shellbank & Hawtree BasinsHoward Beach5,067 properties · 52% with Moderate or High stormwater exposure
- Jamaica Bay & Rockaway InletThe Rockaways11,447 properties · 45% with Moderate or High stormwater exposure