Sewershed WI-008 · NYC DEP Combined Sewer Overflow Tributary Area
WI-008 - Upper East Side, Manhattan
Properties in this area share the WI-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 Upper East Side, Manhattan specifically.
WI-008 is a combined sewer area covering 1,184 properties in Upper East Side, Manhattan. Flood Form rates 31% of them Moderate or High for stormwater exposure, and 26% for groundwater. 65% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 69 ft. The median building dates to 1917. 17% of parcels sit over a historic stream or pond.
1,184
Properties in sewershed
64.9%
Legally eligible for on-site infiltration
31%
Stormwater exposure: Moderate or High
26%
Groundwater exposure: Moderate or High
What sets WI-008 apart
69 ft
Median ground elevation
95%
Average impervious cover per lot
1917
Median year built
17%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Upper East Side 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
- WI-011Yorkville399 properties · 33% with Moderate or High stormwater exposure
- WI-015Yorkville220 properties · 30% with Moderate or High stormwater exposure
- WI-012Yorkville353 properties · 26% with Moderate or High stormwater exposure
- WI-003Lenox Hill1,428 properties · 55% with Moderate or High stormwater exposure
- WI-016Yorkville204 properties · 25% with Moderate or High stormwater exposure
- NCM-005Lenox Hill392 properties · 38% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form