PlainWater
Counties → New York

Jefferson County, New York

Water Systems
154
Population Served
129,617
Total Violations
2,971
869 health-based
PFAS Detected
3
of 4 tested

Violation Analysis

90.3%
Systems with Violations
19.3
Avg Violations per System
29.2%
Health-Based Violations

Water Source Types

SW
28 systems (18%)
GW
22 systems (14%)

PFAS Contamination

4
Systems Tested
3
PFAS Detected
75.0%
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

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

No violations on record (8) One or more violations (42)

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
Fort Drum 34,000 19 Detected
Watertown City 27,861 66 Detected
Leray Town WD 1, 2, 4 7,140 3 Detected
Carthage Village 3,600 56 Clean
Cape Vincent Town WD 1 & 5 2,600 0 -
Sackets Harbor Village 2,200 8 -
Clayton Village 2,100 2 -
Adams Village 2,000 20 -
Can-Am Speedway 2,000 93 -
Alexandria Bay Village 1,900 0 -
Philadelphia Village 1,800 3 -
West Carthage Village 1,734 39 -
Black River Village 1,600 1 -
Cape Vincent Village 1,500 5 -
Stone Mills Museum 1,500 10 -
Ellisburg WD 1, 2 & 3 1,500 4 -
Rutland Town WD 1 1,500 7 -
Brownville Village 1,200 30 -
Dexter Village 1,100 53 -
Adams T WD 1,2,3 (Adams Center) 1,000 6 -
Tiba - Boldt Castle 1,000 0 -
Wellesley Island State Park 1,000 1 -
Pamelia Town WD 4 & 5 1,000 263 -
Theresa Village 950 12 -
Antwerp Village 900 30 -
Thousand Island Park Corp. 900 4 -
Cape Vincent Town WD 3, 4, & 6 770 0 -
Watertown Town WD 3 & 4 & 5 750 27 -
Orleans Town WD 1 (Lafargeville) 750 12 -
Hounsfield WD 2 725 62 -
Henderson Town WD 1,2 700 12 -
Orleans Town WD 2 (Rt 12) 690 0 -
Champion WD 2, 4 & 5 650 11 -
Evans Mills Village 644 22 -
Chaumont Village 625 31 -
Watertown Town WD 1 & 2 600 7 -
Kring Point State Park 600 8 -
Brownville (T) WD #1 600 21 -
Wellesley Island Water Corp. 548 15 -
Northland Estates 540 29 -
Southwick Beach State Park 520 3 -
Glen Park Village 500 19 -
Alexandria Town WD #2 - Redwood 500 12 -
Hounsfield WD 1, 5 480 55 -
Leray Town WD 3 480 0 -
Mannsville Village 450 5 -
Deferiet Village 420 15 -
Champion WD 1 (Great Bend) 400 0 -
Creekstone Farms 400 0 -
Lyme Town WD 2 400 2 -

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 Jefferson County? ▼
Jefferson County has 2,971 total drinking water violations across 154 water systems, of which 869 are health-based violations. 90.3% of systems have at least one violation.
How many people get water from Jefferson County systems? ▼
Water systems in Jefferson County serve approximately 129,617 people through 154 public water systems.
Has PFAS been detected in Jefferson County water? ▼
Of 4 water systems tested for PFAS in Jefferson County, 3 had PFAS detected (75.0% detection rate).
What types of water sources supply Jefferson County? ▼
Water systems in Jefferson County use SW (28 systems), GW (22 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. 29.2% of Jefferson 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.