Sewershed NCM-057 · NYC DEP Combined Sewer Overflow Tributary Area
NCM-057 - Lower East Side, Manhattan
Properties in this area share the NCM-057 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 Lower East Side, Manhattan specifically.
NCM-057 is a combined sewer area covering 158 properties in Lower East Side, Manhattan. Flood Form rates 50% of them Moderate or High for stormwater exposure, and 3% for groundwater. 30% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 32 ft. The median building dates to 1912. 9% of parcels sit over a historic stream or pond.
158
Properties in sewershed
29.7%
Legally eligible for on-site infiltration
50%
Stormwater exposure: Moderate or High
3%
Groundwater exposure: Moderate or High
What sets NCM-057 apart
32 ft
Median ground elevation
97%
Average impervious cover per lot
1912
Median year built
9%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Lower 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
- NCM-028Lower East Side263 properties · 51% with Moderate or High stormwater exposure
- NCM-020East Village623 properties · 54% with Moderate or High stormwater exposure
- NCM-042Lower East Side154 properties · 47% with Moderate or High stormwater exposure
- NCM-063Two Bridges446 properties · 45% with Moderate or High stormwater exposure
- NCM-052East Village1,790 properties · 58% with Moderate or High stormwater exposure
- NCM-050Chinatown1,193 properties · 46% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form