Sewershed 26W-003 · NYC DEP Combined Sewer Overflow Tributary Area
26W-003 - Brownsville, Brooklyn
Properties in this area share the 26W-003 combined sewer — during moderate-to-heavy rain, runoff can exceed pipe capacity faster than it drains, which is what drives sewer backup exposure block by block. Here’s what that looks like for Brownsville, Brooklyn specifically.
26W-003 is a combined sewer area covering 12,515 properties in Brownsville, Brooklyn. Flood Form rates 41% of them Moderate or High for stormwater exposure, and 20% for groundwater. 74% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 29 ft. The median building dates to 1931. 10% of parcels sit over a historic stream or pond. According to NYC DEP green infrastructure records, this sewershed drains to Jamaica Bay and Tributaries. NYC DEP has built 598 green infrastructure assets here.
12,515
Properties in sewershed
73.6%
Legally eligible for on-site infiltration
41%
Stormwater exposure: Moderate or High
20%
Groundwater exposure: Moderate or High
What sets 26W-003 apart
29 ft
Median ground elevation
83%
Average impervious cover per lot
1931
Median year built
10%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Brownsville properties
Downspout Diversion
Redirects roof runoff away from the combined sewer and into landscaped or permeable areas on the lot.
Infiltration System
Drywells or infiltration chambers that let stormwater soak into the ground on-site instead of entering the sewer.
Detention System
Holds stormwater temporarily and releases it slowly, reducing peak flow into the combined sewer during a storm.
Drain Improvement
Upgrades yard, area, or foundation drains so water is carried away from the building instead of pooling.
Foundation Waterproofing
Protects the foundation from groundwater intrusion, relevant where groundwater exposure runs high.
Nearby sewersheds
- 26W-004New Lots4,058 properties · 45% with Moderate or High stormwater exposure
- CI-005East Flatbush13,975 properties · 51% with Moderate or High stormwater exposure
- NCB-015Bushwick19,026 properties · 38% with Moderate or High stormwater exposure
- 26W-005Cypress Hills28,145 properties · 50% with Moderate or High stormwater exposure
- NCB-014Bedford-Stuyvesant16,178 properties · 39% with Moderate or High stormwater exposure
- CI-004Flatlands32,638 properties · 46% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form