Sewershed TI-008 · NYC DEP Combined Sewer Overflow Tributary Area
TI-008 - Hollis Hills, Queens
Properties in this area share the TI-008 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 Hollis Hills, Queens specifically.
TI-008 is a combined sewer area covering 3,243 properties in Hollis Hills, Queens. Flood Form rates 32% of them Moderate or High for stormwater exposure, and 1% for groundwater. 98% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 139 ft. The median building dates to 1950. 10% of parcels sit over a historic stream or pond.
3,243
Properties in sewershed
97.5%
Legally eligible for on-site infiltration
32%
Stormwater exposure: Moderate or High
1%
Groundwater exposure: Moderate or High
What sets TI-008 apart
139 ft
Median ground elevation
63%
Average impervious cover per lot
1950
Median year built
10%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Hollis Hills 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-010Auburndale33,845 properties · 39% with Moderate or High stormwater exposure
- TI-023Clearview4,167 properties · 40% with Moderate or High stormwater exposure
- JAM-005Cambria Heights12,386 properties · 32% with Moderate or High stormwater exposure
- TI-022Flushing1,136 properties · 46% with Moderate or High stormwater exposure
- TI-011Murray Hill4,089 properties · 40% with Moderate or High stormwater exposure
- JAM-006South Richmond Hill327 properties · 50% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form