Sewershed TI-018 · NYC DEP Combined Sewer Overflow Tributary Area
TI-018 - College Point, Queens
Properties in this area share the TI-018 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-018 is a combined sewer area covering 166 properties in College Point, Queens. Flood Form rates 27% of them Moderate or High for stormwater exposure, and none for groundwater. 83% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 28 ft. The median building dates to 1925. According to NYC DEP green infrastructure records, this sewershed drains to Flushing Bay. NYC DEP has built 1 green infrastructure asset here.
166
Properties in sewershed
83.1%
Legally eligible for on-site infiltration
27%
Stormwater exposure: Moderate or High
0%
Groundwater exposure: Moderate or High
What sets TI-018 apart
28 ft
Median ground elevation
87%
Average impervious cover per lot
1925
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-020College Point653 properties · 7% 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
- BB-007East Elmhurst1,033 properties · 15% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form