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This map displays planned infrastructure projects across the Suffolk County Water Authority service territory. To see if construction is scheduled near your home, expand the map or enter your address in the search bar.
SCWA upgrades its distribution system year-round to maintain water quality, support fire protection, and improve reliability. Select a project category below to view the stages of construction:
SCWA replaces aging water mains that are undersized or have a history of frequent breaks. Upgrading these pipelines to new ductile iron pipe improves flow, water pressure, and long-term service reliability.
Project Phases
Crews excavate the trench, lay the new ductile iron main alongside the existing pipe, and backfill the roadway.
The new main is disinfected, flushed, and tested in SCWA’s laboratory to verify water quality before activation.
Individual customer service lines and fire hydrants are transferred from the old pipe to the newly approved water main.
Once the old main is retired and all connections are complete, crews permanently pave and restore the roadway and curb areas.
SCWA extends existing distribution mains into areas previously served by private wells or lacking public water infrastructure to connect new residential and commercial customers.
Crews excavate along the right-of-way and install new water main segments and fire hydrants.
The newly installed pipeline is pressurized, chlorinated, flushed, and sampled to meet strict health standards.
Crews tap the new main to install service connections and meter pits for properties connecting to SCWA’s system.
Trenches, road surfaces, and disturbed right-of-way areas are permanently paved and restored.
SCWA alters and interconnects segments of the distribution system to improve water flow, connect or adjust pressure zones, and build redundancy so service remains uninterrupted during peak demand or emergencies.
Crews install connecting mains, valves, and pressure-regulating equipment to link distribution zones.
All new piping undergoes pressure testing, disinfection, and laboratory water quality verification.
Any affected customer service lines or hydrants along the route are connected to the upgraded main.
Roadways and work zones are permanently repaved and restored once the system upgrades are online.