PlainWater
Counties → New York

Suffolk County, New York

Water Systems
152
Population Served
1,387,905
Total Violations
3,402
513 health-based
PFAS Detected
7
of 10 tested

Violation Analysis

80.9%
Systems with Violations
22.4
Avg Violations per System
15.1%
Health-Based Violations

Water Source Types

GW
49 systems (32%)
SW
1 system (1%)

PFAS Contamination

10
Systems Tested
7
PFAS Detected
70.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Suffolk New York water systems by violation status, EPA SDWIS records.

No violations on record (6) One or more violations (44)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Suffolk County Water Authority 1,100,000 42 Detected
South Huntington Water District 81,760 11 Clean
Greenlawn Water District 42,000 87 Detected
Riverhead Water District 35,000 156 Detected
Dix Hills Water District 34,522 89 Detected
Smithtown Water District 19,635 10 Clean
Hampton Bays Water District 12,500 106 Detected
Robert Moses State Park 11,600 126 -
St James Water District 10,587 9 Detected
Ocean Beach Water District 4,500 226 Clean
Captree State Park 4,100 9 -
Brookhaven National Laboratory 3,500 3 Detected
Northport VA Hospital 3,088 221 -
Greenport Water District 2,050 29 -
Riverside Water District 2,050 3 -
Saltaire Water District 2,000 88 -
Seaview Water Company 1,400 42 -
Valero 1,000 3 -
Calverton Hills Owners Association 897 220 -
Orient Beach State Park 800 8 -
Gilgo Beach 500 3 -
Cedar Beach (Golf Course/Concession) 500 10 -
Kingdom Hall of Jehovah Witnesses 500 0 -
East Moriches Primary Care 500 0 -
Shelter Island Heights Association 463 330 -
Overlook Beach 450 0 -
Shelter Island School 315 13 -
Fishers Island Water Works 300 183 -
West Gilgo Beach Association 300 14 -
Shelter Island Library 258 2 -
Dering Harbor Corp 250 9 -
Camp Blue Bay 200 15 -
Cedar Beach Sportfishing Educ. Center 200 3 -
Atlantic Bluffs Club 200 0 -
Long Island Game Farm 200 18 -
Caribbean Spot 200 6 -
Swans Marina 200 13 -
Joes Kwik Mart 200 6 -
Sag Harbor State Golf Course 200 6 -
Speedway #7794 (Fna Hess General Store) 200 0 -
1983 Montauk Hwy Offices Coparts 190 16 -
Coecles Harbor Marina 150 6 -
Camp Quinipet 150 45 -
D. S. Shanahans 150 4 -
Townline BBQ 150 0 -
Old Stove Pub 150 39 -
Hampton Hills Golf Club 150 4 -
Rock Hill Country Club 150 6 -
La Antigua 150 3 -
Whales Tale 150 3 -

Other Counties in New York

Richmond County
1 systems · 8,271,000 served · 47 violations
Nassau County
44 systems · 1,387,489 served · 7,471 violations
Westchester County
274 systems · 992,853 served · 15,832 violations
Erie County
108 systems · 955,615 served · 7,606 violations
Onondaga County
88 systems · 615,889 served · 2,561 violations
Orleans County
23 systems · 535,814 served · 437 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Suffolk County? ▼
Suffolk County has 3,402 total drinking water violations across 152 water systems, of which 513 are health-based violations. 80.9% of systems have at least one violation.
How many people get water from Suffolk County systems? ▼
Water systems in Suffolk County serve approximately 1,387,905 people through 152 public water systems.
Has PFAS been detected in Suffolk County water? ▼
Of 10 water systems tested for PFAS in Suffolk County, 7 had PFAS detected (70.0% detection rate).
What types of water sources supply Suffolk County? ▼
Water systems in Suffolk County use GW (49 systems), SW (1 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 15.1% of Suffolk County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.