Sewershed HP-009 · NYC DEP Combined Sewer Overflow Tributary Area
HP-009 - Soundview, Bronx
Properties in this area share the HP-009 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 Soundview, Bronx specifically.
HP-009 is a combined sewer area covering 1,644 properties in Soundview, Bronx. Flood Form rates 50% of them Moderate or High for stormwater exposure, and 27% for groundwater. 82% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 19 ft. The median building dates to 1930. 26% 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 8 green infrastructure assets here.
1,644
Properties in sewershed
81.7%
Legally eligible for on-site infiltration
50%
Stormwater exposure: Moderate or High
27%
Groundwater exposure: Moderate or High
What sets HP-009 apart
19 ft
Median ground elevation
89%
Average impervious cover per lot
1930
Median year built
26%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Soundview 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
- HP-008Soundview1,033 properties · 47% with Moderate or High stormwater exposure
- HP-013Unionport4,602 properties · 33% with Moderate or High stormwater exposure
- HP-003Crotona Park East1,661 properties · 34% with Moderate or High stormwater exposure
- HP-012Unionport745 properties · 18% with Moderate or High stormwater exposure
- HP-033Westchester Square3,450 properties · 52% with Moderate or High stormwater exposure
- HP-011Clason Point1,923 properties · 41% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form