County · New York

Suffolk County, New York: drinking water records

Name: Drinking water records for Suffolk County, New York
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 26 community water systems across 108 ZIP codes in Suffolk County, then find water-testing resources and available recent monitoring-station readings.

In focus26Community water systems

Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

Drinking-water records

EPA survey and compliance records are historical reports. UCMR 5 results are available for 10 of the 26 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

systems with a health-based violation since 2016

System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.

Water systems in this county

All 26 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.

Water system	People served	PFAS survey results	PFAS found	Health-based violations	Lead, 9 in 10 homes at or below
Suffolk County Water Authority NY5110526	1,100,000	14,418	10	1	1.3 ppbbelow the action level
Riverhead Water District NY5103705	35,000	600	4	1	2.2 ppbbelow the action level
South Huntington Water District NY5103263	81,760	660	0	0	1 ppbbelow the action level
Greenlawn Water District NY5103271	42,000	720	3	0	6.3 ppbbelow the action level
Dix Hills Water District NY5103276	34,522	480	2	0	1.7 ppbbelow the action level
Smithtown Water District NY5105656	19,635	60	0	0	2.7 ppbbelow the action level
Hampton Bays Water District NY5103704	12,500	300	1	0	1 ppbbelow the action level
St James Water District NY5103266	10,587	60	6	0	1.0 ppbbelow the action level
Ocean Beach Water District NY5103280	4,500	120	0	0	1.2 ppbbelow the action level
Brookhaven National Laboratory NY5111891	3,500	240	1	0	2.7 ppbbelow the action level
Robert Moses State Park NY5117671	11,600	0	0	0	6.9 ppbbelow the action level
Northport VA Hospital NY5111894	3,088	0	0	0	3.3 ppbbelow the action level
Greenport Water District NY5103703	2,050	0	0	0	3.2 ppbbelow the action level
Riverside Water District NY5105655	2,050	0	0	0	1.1 ppbbelow the action level
Saltaire Water District NY5103281	2,000	0	0	0	3.6 ppbbelow the action level
Seaview Water Company NY5110600	1,400	0	0	0	4.5 ppbbelow the action level
Calverton Hills Owners Association NY5112134	897	0	0	0	0 ppbbelow the action level
Shelter Island Heights Association NY5103243	500	0	0	0	1.1 ppbbelow the action level
Fishers Island Water Works NY5103294	380	0	0	0	1.1 ppbbelow the action level
West Gilgo Beach Association NY5110607	300	0	0	0	2.9 ppbbelow the action level
West Neck Water District NY5110623	100	0	0	0	1.3 ppbbelow the action level
Peconic River Mobile Home Park NY5101296	75	0	0	0	3 ppbbelow the action level
Oak Beach Public Water Supply NY5130214	66	0	0	0	3.8 ppbbelow the action level
Peconic View Mobile Home Park NY5101291	40	0	0	0	3.2 ppbbelow the action level
Maidstone Park Cottages NY5114323	34	0	0	0	3 ppbbelow the action level
Dering Harbor Water District NY5103700	14	0	0	0	1.2 ppbbelow the action level

USGS · Monitoring stations

The water, more recently.

Available station readings in Suffolk County, New York. Each measurement keeps its time, unit and original source.

These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.

Recent observations load when this section comes into view.

How these readings update

We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.

Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.

Your next step

Water testing, reports & local help.

Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.

Official national directories

Water testing

Find your state’s private-well program

EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-05

Water testing

Find a certified drinking-water laboratory

Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-11

Public records

Find your utility’s Consumer Confidence Report

EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-09-09

Public records

Explore USGS water observations

Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.

U.S. Geological Survey
Source reviewed 2026-09-15

A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.

Understand water testing and laboratory reports

Resource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction

Explore your area

Local coverage in Suffolk County

108ZIP areas in this overview

Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.

Towns and communities

Amityville
Aquebogue
Bayport
Blue Point
Bohemia
Brentwood
Bridgehampton
Brightwaters
Brookhaven
Calverton
Center Moriches
Centereach
Centerport
Central Islip
Cold Spring Harbor
Commack
Copiague
Coram
Cutchogue
Deer Park
Dix Hills
East Farmingdale
East Islip
East Marion
East Moriches
East Northport
East Patchogue
East Quogue
East Setauket
East Shoreham
Eastport
Farmingville
Fire Island
Fishers Island
Fort Salonga
Gilgo
Great River
Greenlawn
Greenport West
Hampton Bays
Hauppauge
Holbrook
Holtsville
Islandia
Islip
Jamesport
Kings Park
Lake Grove
Laurel
Lindenhurst
Lloyd Harbor
Manorville
Mastic
Mastic Beach
Mattituck
Medford
Melville
Middle Island
Miller Place
Montauk
Moriches
Mount Sinai
Napeague
Nesconset
New Suffolk
Nissequogue
North Babylon
North Bellport
North Great River
North Sea
Northwest Harbor
Noyack
Oakdale
Orient
Peconic
Port Jefferson
Quogue
Remsenburg-Speonk
Ridge
Riverhead
Rocky Point
Ronkonkoma
Sagaponack
Sayville
Selden
Shelter Island
Shelter Island Heights
Shirley
Smithtown
Sound Beach
Southold
Stony Brook
Stony Brook University
Terryville
Wading River
Wainscott
Water Mill
West Babylon
West Islip
West Sayville
Westhampton
Wyandanch
Yaphank

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

06390Fishers Island
11701Amityville
11702Gilgo
11703North Babylon
11704West Babylon
11705Bayport
11706Fire Island
11713North Bellport
11715Blue Point
11716Bohemia
11717Brentwood
11718Brightwaters
11719Brookhaven
11720Centereach
11721Centerport
11722Central Islip
11724Cold Spring Harbor
11725Commack
11726Copiague
11727Coram
11729Deer Park
11730East Islip
11731East Northport
11733East Setauket
11735East Farmingdale
11738Farmingville
11739Great River
11740Greenlawn
11741Holbrook
11742Holtsville
11743Lloyd Harbor
11746Dix Hills
11747Melville
11749Islandia
11751Islip
11752North Great River
11754Kings Park
11755Lake Grove
11757Lindenhurst
11763Medford
11764Miller Place
11766Mount Sinai
11767Nesconset
11768Fort Salonga
11769Oakdale
11770Fire Island
11772East Patchogue
11776Terryville
11777Port Jefferson
11778Rocky Point
11779Ronkonkoma
11780Nissequogue
11782Sayville
11784Selden
11786East Shoreham
11787Smithtown
11788Hauppauge
11789Sound Beach
11790Stony Brook
11792Wading River
11794Stony Brook University
11795West Islip
11796West Sayville
11798Wyandanch
11901Riverhead
11930Napeague
11931Aquebogue
11932Bridgehampton
11933Calverton
11934Center Moriches
11935Cutchogue
11937Northwest Harbor
11939East Marion
11940East Moriches
11941Eastport
11942East Quogue
11944Greenport West
11946Hampton Bays
11947Jamesport
11948Laurel
11949Manorville
11950Mastic
11951Mastic Beach
11952Mattituck
11953Middle Island
11954Montauk
11955Moriches
11956New Suffolk
11957Orient
11958Peconic
11959Quogue
11960Remsenburg-Speonk
11961Ridge
11962Sagaponack
11963Noyack
11964Shelter Island
11965Shelter Island Heights
11967Shirley
11968North Sea
11970Jamesport
11971Southold
11972Remsenburg-Speonk
11973
11975Wainscott
11976Water Mill
11977Westhampton
11978Westhampton
11980Yaphank

These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.

Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.

Beyond this county page

Keep reading. Compare nearby.

PFASChoosing a PFAS filterPFAS was found in 7 of the 10 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter6 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near Suffolk County

All New York counties

Sources and scope

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.

Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.