Sewershed HP-004 · NYC DEP Combined Sewer Overflow Tributary Area
HP-004 - Belmont, Bronx
Properties in this area share the HP-004 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 Belmont, Bronx specifically.
HP-004 is a combined sewer area covering 2,608 properties in Belmont, Bronx. Flood Form rates 39% of them Moderate or High for stormwater exposure, and 25% for groundwater. 68% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 80 ft. The median building dates to 1931. 19% of parcels sit over a historic stream or pond. According to NYC DEP green infrastructure records, this sewershed drains to Bronx River. NYC DEP has built 42 green infrastructure assets here.
2,608
Properties in sewershed
68.3%
Legally eligible for on-site infiltration
39%
Stormwater exposure: Moderate or High
25%
Groundwater exposure: Moderate or High
What sets HP-004 apart
80 ft
Median ground elevation
87%
Average impervious cover per lot
1931
Median year built
19%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Belmont 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-068Mott Haven8,315 properties · 34% with Moderate or High stormwater exposure
- WI-057Fordham855 properties · 29% with Moderate or High stormwater exposure
- WI-062Mount Eden3,099 properties · 44% with Moderate or High stormwater exposure
- WI-058Morris Heights490 properties · 20% with Moderate or High stormwater exposure
- HP-009Soundview1,644 properties · 50% with Moderate or High stormwater exposure
- HP-003Crotona Park East1,661 properties · 34% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form