PlainWater
Counties → New York

St. Lawrence County, New York

Water Systems
227
Population Served
81,119
Total Violations
16,172
548 health-based
PFAS Detected
0
of 5 tested

Violation Analysis

98.7%
Systems with Violations
71.2
Avg Violations per System
3.4%
Health-Based Violations

Water Source Types

GW
41 systems (18%)
SW
9 systems (4%)

PFAS Contamination

5
Systems Tested
0
PFAS Detected
0.0%
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

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

No violations on record (0) One or more violations (50)

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
Massena Village 16,729 23 Clean
Ogdensburg City 10,064 13 Clean
Potsdam Village 8,312 199 Clean
Canton Village 7,055 18 Clean
Gouverneur 4,263 149 Clean
East Louisville Water District 3,235 4 -
Norfolk Water District 2,300 222 -
Norwood 1,685 1 -
Star Lake Water District 1,250 239 -
Waddington Village 944 34 -
Colton Water District 850 6 -
Heuvelton Village 830 32 -
Madrid Water District 800 16 -
Edwards-Knox Central School 800 107 -
Madrid-Waddington Central School 700 17 -
Massawepie Scout Camps 600 100 -
Jakes on the Water 517 115 -
Cranberry Lake Campground 500 33 -
Lisbon Water District 499 35 -
Hermon-Dekalb Central School 492 23 -
Hermon Water District 492 23 -
Dekalb Water District 492 42 -
St. Lawrence Central JR-SR High 490 9 -
Coles Creek State Campsite 470 27 -
Edwards Water District 465 8 -
St. Lawrence Central Elementary 460 11 -
Parishville Water District #1 450 12 -
Robert Moses State Park 407 25 -
Higley Flow State Park 400 44 -
Town of Lisbon Campground 400 62 -
Morristown Water District 395 40 -
Hammond Central School 380 85 -
Gran View 350 45 -
Postwood Park 350 48 -
Wal-Mart Potsdam 350 23 -
Southwest Tech 272 60 -
Corning 260 8 -
Nypa Hawkins Point Visitors Center 260 2 -
Seaway Area Technology Center 250 26 -
Schermerhorn Harbor LLC 250 66 -
Schermerhorn Landing-Duck Cove 250 7 -
Stables @ Windy Point 250 86 -
Chars Bar 221 59 -
Potsdam Water District No. 1 220 19 -
Wanakena Water Company 200 24 -
McLears Cottage Colony Inc 200 61 -
Waddington Town Beach 200 52 -
New York Power Authority 200 89 -
Gerald Roy Amvets Post #4 200 39 -
Helena Water District 180 8 -

Other Counties in New York

Richmond County
1 systems · 8,271,000 served · 47 violations
Suffolk County
152 systems · 1,387,905 served · 3,402 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

Drinking Water Guides

Frequently Asked Questions

How many water violations are in St. Lawrence County? ▼
St. Lawrence County has 16,172 total drinking water violations across 227 water systems, of which 548 are health-based violations. 98.7% of systems have at least one violation.
How many people get water from St. Lawrence County systems? ▼
Water systems in St. Lawrence County serve approximately 81,119 people through 227 public water systems.
Has PFAS been detected in St. Lawrence County water? ▼
Of 5 water systems tested for PFAS in St. Lawrence County, 0 had PFAS detected (0.0% detection rate).
What types of water sources supply St. Lawrence County? ▼
Water systems in St. Lawrence County use GW (41 systems), SW (9 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. 3.4% of St. Lawrence 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.