Sewershed NR-037 · NYC DEP Combined Sewer Overflow Tributary Area
NR-037 - Upper West Side, Manhattan
Properties in this area share the NR-037 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 West Side, Manhattan specifically.
NR-037 is a combined sewer area covering 1,487 properties in Upper West Side, Manhattan. Flood Form rates 31% of them Moderate or High for stormwater exposure, and 30% for groundwater. 72% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 81 ft. The median building dates to 1892. 32% 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 4 green infrastructure assets here.
1,487
Properties in sewershed
71.6%
Legally eligible for on-site infiltration
31%
Stormwater exposure: Moderate or High
30%
Groundwater exposure: Moderate or High
What sets NR-037 apart
81 ft
Median ground elevation
95%
Average impervious cover per lot
1892
Median year built
32%
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 West 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
- NR-038Upper West Side1,521 properties · 35% with Moderate or High stormwater exposure
- WI-003Lenox Hill1,428 properties · 55% with Moderate or High stormwater exposure
- NCM-036Upper East Side1,944 properties · 56% with Moderate or High stormwater exposure
- WI-008Upper East Side1,184 properties · 31% with Moderate or High stormwater exposure
- NR-033Hell's Kitchen1,803 properties · 58% with Moderate or High stormwater exposure
- NR-040Manhattan Valley1,080 properties · 33% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form