Sewershed NR-041 · NYC DEP Combined Sewer Overflow Tributary Area
NR-041 - Morningside Heights, Manhattan
Properties in this area share the NR-041 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 Morningside Heights, Manhattan specifically.
NR-041 is a combined sewer area covering 207 properties in Morningside Heights, Manhattan. Flood Form rates 39% of them Moderate or High for stormwater exposure, and 10% for groundwater. 68% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 111 ft. The median building dates to 1910. 21% of parcels sit over a historic stream or pond.
207
Properties in sewershed
68.1%
Legally eligible for on-site infiltration
39%
Stormwater exposure: Moderate or High
10%
Groundwater exposure: Moderate or High
What sets NR-041 apart
111 ft
Median ground elevation
95%
Average impervious cover per lot
1910
Median year built
21%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Morningside Heights 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
- NR-040Manhattan Valley1,080 properties · 33% with Moderate or High stormwater exposure
- NR-043Harlem2,288 properties · 50% with Moderate or High stormwater exposure
- WI-024Harlem1,767 properties · 33% with Moderate or High stormwater exposure
- NR-038Upper West Side1,521 properties · 35% with Moderate or High stormwater exposure
- WI-038Harlem671 properties · 30% with Moderate or High stormwater exposure
- WI-023East Harlem930 properties · 50% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form