Sewershed TI-003 · NYC DEP Combined Sewer Overflow Tributary Area
TI-003 - Whitestone, Queens
Properties in this area share the TI-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 Whitestone, Queens specifically.
TI-003 is a combined sewer area covering 2,147 properties in Whitestone, Queens. Flood Form rates 34% of them Moderate or High for stormwater exposure, and 2% for groundwater. 93% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 62 ft. The median building dates to 1938. 9% of parcels sit over a historic stream or pond. According to NYC DEP green infrastructure records, this sewershed drains to East River / Open Waters. NYC DEP has built 92 green infrastructure assets here.
2,147
Properties in sewershed
92.5%
Legally eligible for on-site infiltration
34%
Stormwater exposure: Moderate or High
2%
Groundwater exposure: Moderate or High
What sets TI-003 apart
62 ft
Median ground elevation
78%
Average impervious cover per lot
1938
Median year built
9%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Whitestone 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
- TI-004Whitestone480 properties · 16% with Moderate or High stormwater exposure
- TI-023Clearview4,167 properties · 40% with Moderate or High stormwater exposure
- TI-011Murray Hill4,089 properties · 40% with Moderate or High stormwater exposure
- TI-015College Point215 properties · 11% with Moderate or High stormwater exposure
- TI-016College Point1,285 properties · 40% with Moderate or High stormwater exposure
- TI-020College Point653 properties · 7% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form