Sewershed TI-020 · NYC DEP Combined Sewer Overflow Tributary Area
TI-020 - College Point, Queens
Properties in this area share the TI-020 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 College Point, Queens specifically.
TI-020 is a combined sewer area covering 653 properties in College Point, Queens. Flood Form rates 7% of them Moderate or High for stormwater exposure, and 3% for groundwater. 90% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 40 ft. The median building dates to 1930.
653
Properties in sewershed
90.2%
Legally eligible for on-site infiltration
7%
Stormwater exposure: Moderate or High
3%
Groundwater exposure: Moderate or High
What sets TI-020 apart
40 ft
Median ground elevation
76%
Average impervious cover per lot
1930
Median year built
0%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for College Point 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-019College Point248 properties · 29% with Moderate or High stormwater exposure
- TI-016College Point1,285 properties · 40% with Moderate or High stormwater exposure
- TI-018College Point166 properties · 27% with Moderate or High stormwater exposure
- TI-015College Point215 properties · 11% with Moderate or High stormwater exposure
- TI-014College Point272 properties · 4% with Moderate or High stormwater exposure
- TI-003Whitestone2,147 properties · 34% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form