Sewershed JAM-003a · NYC DEP Combined Sewer Overflow Tributary Area
JAM-003a - South Ozone Park, Queens
Properties in this area share the JAM-003a 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 South Ozone Park, Queens specifically.
JAM-003a is a combined sewer area covering 2,900 properties in South Ozone Park, Queens. Flood Form rates 42% of them Moderate or High for stormwater exposure, and 11% for groundwater. 92% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 25 ft. The median building dates to 1940. 7% of parcels sit over a historic stream or pond. According to NYC DEP green infrastructure records, this sewershed drains to Jamaica Bay and Tributaries. NYC DEP has built 243 green infrastructure assets here.
2,900
Properties in sewershed
91.6%
Legally eligible for on-site infiltration
42%
Stormwater exposure: Moderate or High
11%
Groundwater exposure: Moderate or High
What sets JAM-003a apart
25 ft
Median ground elevation
78%
Average impervious cover per lot
1940
Median year built
7%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for South Ozone Park 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
- JAM-003South Ozone Park21,926 properties · 49% with Moderate or High stormwater exposure
- JAM-006South Richmond Hill327 properties · 50% with Moderate or High stormwater exposure
- 26W-005Cypress Hills28,145 properties · 50% with Moderate or High stormwater exposure
- JAM-005Cambria Heights12,386 properties · 32% with Moderate or High stormwater exposure
- 26W-004New Lots4,058 properties · 45% with Moderate or High stormwater exposure
- BB-006Forest Hills19,223 properties · 40% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form