Sewershed NCM-075 · NYC DEP Combined Sewer Overflow Tributary Area
NCM-075 - SoHo, Manhattan
Properties in this area share the NCM-075 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 SoHo, Manhattan specifically.
NCM-075 is a combined sewer area covering 1,185 properties in SoHo, Manhattan. Flood Form rates 63% of them Moderate or High for stormwater exposure, and 37% for groundwater. 23% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 17 ft. The median building dates to 1888. 43% 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 1 green infrastructure asset here.
1,185
Properties in sewershed
22.5%
Legally eligible for on-site infiltration
63%
Stormwater exposure: Moderate or High
37%
Groundwater exposure: Moderate or High
What sets NCM-075 apart
17 ft
Median ground elevation
98%
Average impervious cover per lot
1888
Median year built
43%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for SoHo 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
- NCM-074Tribeca132 properties · 27% with Moderate or High stormwater exposure
- NCM-073Tribeca441 properties · 54% with Moderate or High stormwater exposure
- NCM-050Chinatown1,193 properties · 46% with Moderate or High stormwater exposure
- NCM-076West Village1,904 properties · 50% with Moderate or High stormwater exposure
- NCM-020East Village623 properties · 54% with Moderate or High stormwater exposure
- NC-081West Village536 properties · 43% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form