Sewershed BB-029 · NYC DEP Combined Sewer Overflow Tributary Area
BB-029 - Astoria, Queens
Properties in this area share the BB-029 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 Astoria, Queens specifically.
BB-029 is a combined sewer area covering 2,689 properties in Astoria, Queens. Flood Form rates 44% of them Moderate or High for stormwater exposure, and 22% for groundwater. 79% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 41 ft. The median building dates to 1929. 16% of parcels sit over a historic stream or pond.
2,689
Properties in sewershed
78.5%
Legally eligible for on-site infiltration
44%
Stormwater exposure: Moderate or High
22%
Groundwater exposure: Moderate or High
What sets BB-029 apart
41 ft
Median ground elevation
88%
Average impervious cover per lot
1929
Median year built
16%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Astoria 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-031Astoria555 properties · 45% with Moderate or High stormwater exposure
- BB-030Hallets Point235 properties · 60% with Moderate or High stormwater exposure
- BB-028Woodside5,778 properties · 37% with Moderate or High stormwater exposure
- BB-032Hallets Point180 properties · 8% with Moderate or High stormwater exposure
- BB-034Ditmars5,122 properties · 39% with Moderate or High stormwater exposure
- BB-027Queensbridge130 properties · 58% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form