Sewershed HP-014 · NYC DEP Combined Sewer Overflow Tributary Area
HP-014 - Williamsbridge, Bronx
Properties in this area share the HP-014 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 Williamsbridge, Bronx specifically.
HP-014 is a combined sewer area covering 14,618 properties in Williamsbridge, Bronx. Flood Form rates 32% of them Moderate or High for stormwater exposure, and 14% for groundwater. 91% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 101 ft. The median building dates to 1950. 9% of parcels sit over a historic stream or pond. According to NYC DEP green infrastructure records, this sewershed drains to Westchester Creek. NYC DEP has built 66 green infrastructure assets here.
14,618
Properties in sewershed
91.2%
Legally eligible for on-site infiltration
32%
Stormwater exposure: Moderate or High
14%
Groundwater exposure: Moderate or High
What sets HP-014 apart
101 ft
Median ground elevation
75%
Average impervious cover per lot
1950
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 Williamsbridge 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-031Edenwald481 properties · 7% with Moderate or High stormwater exposure
- HP-007Woodlawn8,916 properties · 42% with Moderate or High stormwater exposure
- HP-023Eastchester396 properties · 51% with Moderate or High stormwater exposure
- HP-024Wakefield7,565 properties · 41% with Moderate or High stormwater exposure
- HP-015Pelham Bay1,919 properties · 42% with Moderate or High stormwater exposure
- HP-033Westchester Square3,450 properties · 52% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form