County · New York

St. Lawrence County, New York: drinking water records

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

Explore EPA records for 40 community water systems across 45 ZIP codes in St. Lawrence County, then find water-testing resources and available recent monitoring-station readings.

In focus40Community 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 5 of the 40 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 40 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
Potsdam Village NY4404397	8,312	120	0	2	7.8 ppbbelow the action level
Massena Village NY4404390	16,729	95	0	0	1.5 ppbbelow the action level
Ogdensburg City NY4404394	10,064	120	2	0	1.4 ppbbelow the action level
Canton Village NY4404381	7,055	300	0	0	2.8 ppbbelow the action level
Gouverneur NY4404385	4,263	240	0	0	2.3 ppbbelow the action level
East Louisville Water District NY4430133	3,235	0	0	0	1.1 ppbbelow the action level
Norfolk Water District NY4404392	2,300	0	0	0	1 ppbbelow the action level
Norwood NY4404393	1,685	0	0	0	2.6 ppbbelow the action level
Star Lake Water District NY4404398	1,250	0	0	0	2 ppbbelow the action level
Waddington Village NY4404400	944	0	0	0	4.3 ppbbelow the action level
Colton Water District NY4404404	850	0	0	0	2.6 ppbbelow the action level
Heuvelton Village NY4404387	830	0	0	0	2.2 ppbbelow the action level
Madrid Water District NY4404389	800	0	0	0	3.7 ppbbelow the action level
Lisbon Water District NY4421088	499	0	0	0	0 ppbbelow the action level
Dekalb Water District NY4430115	492	0	0	0	7 ppbbelow the action level
Hermon Water District NY4404386	492	0	0	0	4.2 ppbbelow the action level
Edwards Water District NY4404384	465	0	0	0	4.2 ppbbelow the action level
Parishville Water District #1 NY4404395	450	0	0	0	2.6 ppbbelow the action level
Morristown Water District NY4404391	395	0	0	0	3.4 ppbbelow the action level
Potsdam Water District No. 1 NY4404399	220	0	0	0	1 ppbbelow the action level
Wanakena Water Company NY4404401	200	0	0	0	1.8 ppbbelow the action level
Helena Water District NY4430165	180	0	0	0	1 ppbbelow the action level
Gouverneur East Side Water District NY4430137	165	0	0	0	1.3 ppbbelow the action level
Gouverneur West Side Water District NY4430138	165	0	0	0	6 ppbbelow the action level
Piercefield Water District NY4404396	164	0	0	0	0.9 ppbbelow the action level
Church Creek Mobile Home Community NY4410170	150	0	0	0	0.6 ppbbelow the action level
Morleys Mobile Park NY4410166	150	0	0	0	1.2 ppbbelow the action level
L.B.S.H. Housing NY4420611	100	0	0	0	5.0 ppbbelow the action level
Champion Mobile Home Park NY4410156	82	0	0	0	4.1 ppbbelow the action level
Conifer Water District NY4417731	80	0	0	0	15.1 ppbat or above the action level
Hannawa Building Corp. NY4404402	70	0	0	0	3.4 ppbbelow the action level
Morning Star Village NY4410167	65	0	0	0	1 ppbbelow the action level
Bob Scotts Mobile Home Park NY4410149	50	0	0	0	1.4 ppbbelow the action level
Clarks Trailer Park NY4410159	50	0	0	0	3.5 ppbbelow the action level
White Birch Mobile Home NY4410705	44	0	0	0	1 ppbbelow the action level
Crescent Meadow Apt Community NY4430128	30	0	0	0	1 ppbbelow the action level
Pine Grove Mobile Home Park NY4410176	30	0	0	0	1 ppbbelow the action level
Boyden Brook Mobile Home Community NY4410154	25	0	0	0	1.4 ppbbelow the action level
Garden Place Estates NY4430146	25	0	0	0	1 ppbbelow the action level
Snells Complex NY4430200	25	0	0	0	5.0 ppbbelow the action level

Shaded rows report lead at or above the 15 ppb action level in their latest monitoring period. EPA sets that level for the value 9 in 10 sampled homes fall at or below; reaching it requires the utility to act, and it is not a measurement of any single tap. One system in this table is at or above it. What an action level means

USGS · Monitoring stations

The water, more recently.

Available station readings in St. Lawrence 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 St. Lawrence County

45ZIP 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

Akwesasne
Brasher Falls
Canton
Colton
Cranberry Lake
DeKalb Junction
Edwards
Hailesboro
Hammond
Hannawa Falls
Hermon
Heuvelton
Madrid
Morristown
Norfolk
Norwood
Ogdensburg
Parishville
Potsdam
Rensselaer Falls
Richville
Star Lake
Waddington
Winthrop

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

12922
12927Cranberry Lake
12965
12967
12973
13613Brasher Falls
13614
13617Canton
13621
13623
13625Colton
13630DeKalb Junction
13633
13635Edwards
13639
13642Hailesboro
13645Hailesboro
13646Hammond
13647Hannawa Falls
13649Akwesasne
13652Hermon
13654Heuvelton
13658
13660Madrid
13662Akwesasne
13664Morristown
13666Cranberry Lake
13667Norfolk
13668Norwood
13669Ogdensburg
13670
13672Parishville
13676Potsdam
13678
13680Rensselaer Falls
13681Richville
13683Akwesasne
13684
13687
13690Star Lake
13694Waddington
13695
13696
13697Winthrop
13699Potsdam

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 1 of the 5 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter17 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 St. Lawrence 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.