infrastructure
$42M Water Main Replacement Program Advances to Phase 3
The Suffolk County Water Authority has begun Phase 3 of its comprehensive water main replacement program, targeting aging infrastructure in the Babylon and Islip corridors.
Suffolk County Water Authority
Safe, clean water for every family
Serving over 1.2 million Suffolk County residents with high-quality drinking water drawn from Long Island's pristine underground aquifer system. Your water is tested over 30,000 times each year.
1.2M+
Residents Served
425+
Active Wells
30,000+
Annual Tests
4,800+
Miles of Main
Trusted public utility
Aquifer-first operations, proactive maintenance, and transparent water quality reporting for Suffolk County residents.
24/7
Emergency support
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Our Coverage
Service Areas
SCWA operates across three major service regions, maintaining over 425 wells and 4,800 miles of water main throughout Suffolk County.
Western Suffolk
Serving communities from Huntington to Babylon, including Deer Park, Lindenhurst, and West Islip.
420,000
Population Served
165
Active Wells
Central Suffolk
Covering Smithtown, Hauppauge, Ronkonkoma, Holbrook, and surrounding communities.
380,000
Population Served
142
Active Wells
Eastern Suffolk
Serving Patchogue, Mastic, Shirley, Riverhead, and eastern Long Island communities.
310,000
Population Served
118
Active Wells
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Latest News
water-quality
SCWA Achieves Top Rating in Annual Water Quality Assessment
For the 12th consecutive year, SCWA's water supply meets or exceeds all federal and state drinking water standards, with contaminant levels well below EPA maximums.
board
Board Approves New Aquifer Protection Initiative
The Board of Directors unanimously approved a $15M initiative to enhance monitoring and protection of the Long Island aquifer system that supplies Suffolk County's drinking water.
conservation
Summer Conservation Program Registration Now Open
Residents can now register for SCWA's 2026 Summer Wise Water Use program. Participating households that meet conservation targets will receive a credit on their next bill.
Upcoming Events
Meetings, workshops, and outreach
April 18, 2026
Water Quality Open House
Public information session covering annual water quality reporting and current treatment initiatives.
May 9, 2026
Smart Irrigation Workshop
Community workshop for homeowners and irrigation contractors.
June 4, 2026
Board of Directors Meeting
Board meeting agenda, notices, and participation details.
Stakeholder Feedback
Modernization outcomes that matter
The redesigned SCWA experience makes it much easier to find alerts, documents, and billing information without calling support.
Ellen R.
Resident, Islip, SCWA Customer
Together We Can Make a Difference
Help Protect Long Island's Water
Our aquifer is a precious resource. Explore conservation programs, rebates, and tips to reduce your water footprint and save money.