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NYC.WORLD· Open Data · FY2026
Overview→Programs→Urban Flooding & Combined Sewer Overflows

Urban Flooding & Combined Sewer Overflows

Tier 265% confidenceEnvironmentExpense

Indirect — requires joins or inference

Department of Environmental ProtectionDepartment of Emergency ManagementDepartment of Design and Construction

The Civic Issue

NYC's 7,500 miles of sewers are 60% combined (sewage + stormwater in one pipe). During heavy rain, raw sewage overflows into waterways — 27 billion gallons/year. 86 locations need $30B in resilience work, and cloudburst events are intensifying 19-24%. Residents in low-lying neighborhoods face recurring street flooding, basement backups, and health risks from CSOs.

Headline Spending

$436.2M

identifiable in budget

Budget Lines (Adopted)

$339.9M

26 lines

Vendor Spending

$210.6M

9 vendors

Budget Lines

LineAdoptedSpent

WASTE WATER TREATMENT

UTILITY - OTPS

$118.7M$2.4M

WASTEWATER TREATMENT

WASTEWATER TREATMENT

$60.7M$34.6M

SLUDGE DISPOSAL CONTRACTS

UTILITY - OTPS

$63.0M$37.8M

GREEN INFRASTRUCTURE MAINTENANCE

WATER SUP. & WASTEWATER COLL

$9.7M$4.2M

BWSO Catch Basin Installation and Rehab

UTILITY - OTPS

$9.7M$225

CMOM Program

UTILITY - OTPS

$8.2M$7.1M

GREEN INFRASTRUCTURE

WATER SUP. & WASTEWATER COLL

$4.9M$3.9M

GREEN INFRASTRUCTURE

UTILITY - OTPS

$4.0M$802.6K

Arterial Hwy Catch Basin Cleaning OTPS

ENVIRONMENTAL MANAGEMENT -OTPS

$4.0M$1.3M

MS4 Tax Levy OTPS

ENVIRONMENTAL MANAGEMENT -OTPS

$3.1M$1.4M

Drainage Management

UTILITY - OTPS

$7.8M$2.4M

W S WASTE WATER COLLECTION

UTILITY - OTPS

$10.6M$813.4K

BWSO Sewer Lining

UTILITY - OTPS

$5.0M$1.8M

Flash Flood Response PS

WATER SUP. & WASTEWATER COLL

$1.8M$1.6M

FloodNet Stormwater Resiliency

UTILITY - OTPS

$1.8M$320.4K

GI Private Incentive Grant Initiative

UTILITY - OTPS

$14.7M$3.5M

BEPA Stormwater Resiliency

UTILITY - OTPS

$1.4M$610.5K

BWSO Green Infrastructure

UTILITY - OTPS

$1.2M$786.6K

COASTAL RESILIENCY OTPS

ENVIRONMENTAL MANAGEMENT -OTPS

$1.5M$0

MS4 BEPA Stormwater Permitting Program

UTILITY - OTPS

$900.0K$375.0K

Stormwater Resil. Mappin COY

EXECUTIVE & SUPPORT-OTPS

$500.0K$0

GREEN INFRASTRUCTURE - RAIN BARRELS

UTILITY - OTPS

$500.0K$0

BWSO Sewer Reconstruction

UTILITY - OTPS

$2.5M$0

BWSO Sewer Guniting

UTILITY - OTPS

$1.0M$799.8K

BWSO Sewer TV Inspection and Cleaning

UTILITY - OTPS

$2.0M$0

Flood Protection - Trap Bags

DOEM - OTPS

$500.0K$24.4K

Vendor Spending (FY2026)

GOWANUS CANAL CONSTRUCTORS$59.8M37 txns
SKANSKA RJ INDUSTRIES HPWWTP JV$56.1M67 txns
HAZEN & SAWYER$29.8M645 txns
ARCADIS OF NEW YORK INC$29.2M370 txns
NATIONAL WATER MAIN CLEANING CO$12.4M79 txns
PASSAIC VALLEY SEWERAGE COM.$11.0M8 txns
EN-TECH INFRASTRUCTURE LLC$10.4M118 txns
Hazen-Arcadis a Joint Venture for Cloudburst$1.3M12 txns
Hazen-Arcadis a Joint Venture for BEPA-WSRP$610.5K11 txns

Total Identifiable Spending

$436.2M adopted in wastewater/sewer/drainage/stormwater budget lines + $942.5M in DEP capital construction (IOTB)

Budget Line Breakdown (Adopted)

Top Vendors

What the Data Shows

DEP's wastewater, sewer, drainage, and stormwater budget lines total $436.2M adopted for FY2026 — roughly 25% of DEP's $1.75B total budget. The CMOM (Capacity, Management, Operations & Maintenance) program nearly doubled mid-year from $8.2M to $14.3M, reflecting growing maintenance urgency. Green infrastructure across all DEP lines totals $41.6M adopted, including a $14.7M private incentive grant initiative. Capital spending (IOTB construction) is $942.5M — the primary funding channel for major sewer upgrades, CSO reduction, and resilience projects like the Gowanus Canal cleanup ($76.2M in vendor spending to Gowanus-related JVs).

What the Data Misses

The $30B resilience need cited in city studies dwarfs the current capital spending. Most flood resilience projects are multi-year capital programs that span 5-10+ years and only show partial-year spending. Federal funding (FEMA, EPA CSO consent orders) flows through separately. The FloodNet sensor network ($1.8M) and cloudburst engineering ($1.3M) are new programs that are small relative to the need. DDC also builds sewer infrastructure on DEP's behalf, but DDC's budget doesn't break out DEP-funded projects.

Key Context

NYC operates 14 wastewater resource recovery facilities treating 1.3B gallons/day. The EPA consent order mandates CSO reduction. DEP's Long Term Control Plans commit to green infrastructure (bioswales, rain gardens, permeable pavement) to reduce CSO volumes. The "Catch Basin Installation and Rehab" line dropped dramatically mid-year ($9.7M adopted to $1.75M modified), suggesting either program delays or budget reallocation. The Hazen-Arcadis Cloudburst JV ($1.35M) directly studies cloudburst resilience — the engineering analysis behind the 19-24% rainfall intensification projections.