Sewershed BB-023 · NYC DEP Combined Sewer Overflow Tributary Area
BB-023 - Long Island City, Queens
Properties in this area share the BB-023 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 Long Island City, Queens specifically.
BB-023 is a combined sewer area covering 282 properties in Long Island City, Queens. Flood Form rates 73% of them Moderate or High for stormwater exposure, and 50% for groundwater. 50% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 14 ft. The median building dates to 1930. 38% of parcels sit over a historic stream or pond.
282
Properties in sewershed
50%
Legally eligible for on-site infiltration
73%
Stormwater exposure: Moderate or High
50%
Groundwater exposure: Moderate or High
What sets BB-023 apart
14 ft
Median ground elevation
89%
Average impervious cover per lot
1930
Median year built
38%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Long Island City 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
- BB-021Long Island City380 properties · 62% with Moderate or High stormwater exposure
- BB-024Queensbridge459 properties · 67% with Moderate or High stormwater exposure
- BB-013Long Island City119 properties · 64% with Moderate or High stormwater exposure
- BB-027Queensbridge130 properties · 58% with Moderate or High stormwater exposure
- NCB-022Greenpoint318 properties · 39% with Moderate or High stormwater exposure
- NCM-034Turtle Bay131 properties · 66% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form