PlainWater
Counties → Connecticut

New London County, Connecticut

Water Systems
396
Population Served
209,068
Total Violations
34,737
4,536 health-based
PFAS Detected
5
of 8 tested

Violation Analysis

91.4%
Systems with Violations
87.7
Avg Violations per System
13.1%
Health-Based Violations

Water Source Types

GW
35 systems (9%)
SW
15 systems (4%)

PFAS Contamination

8
Systems Tested
5
PFAS Detected
62.5%
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

New London Connecticut water systems by violation status, EPA SDWIS records.

No violations on record (1) One or more violations (49)

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
Norwich Public Utilities 36,163 97 Detected
Groton Utilities 30,200 6 Clean
New London Dept. of Public Utilities 27,620 203 Clean
Waterford Wpca 16,578 104 Clean
East Lyme Water & Sewer Commission 15,245 532 Detected
Aquarion-Mystic 10,788 162 Detected
Jewett City Water Company 6,840 134 Detected
Colchester Sewer & Water Commission 4,020 159 Detected
Ledyard Wpca - Ledyard Center 3,294 13 -
Ctwc - Shoreline Region-Sound View 3,028 134 -
Scwa, Montville Division (Mtv) 2,570 28 -
Scwa, Tower-Ferry View Division 2,567 54 -
Groton Long Point Association 2,400 69 -
Ledyard Wpca, Gales Ferry System 2,369 23 -
Noank Fire District 1,947 59 -
Scwa, North Stonington Division (Nst) 1,860 33 -
Leonard J.tyl Middle School&high School 1,466 328 -
Scwa, Mohegan Division 1,428 17 -
Montville Water Supply 1,300 87 -
Region 18 Schools - Lyme Street 1,102 130 -
Ctwc - Shoreline Region-Point O Woods 1,068 113 -
Sprague Water & Sewer Authority 1,058 192 -
Strawberry Park 1,047 65 -
St. Bernard School 950 70 -
Oakdale Heights Association, Inc 876 67 -
Hopeville Pond S.p./Beach-Well #2 800 22 -
Indian Field Coop Campground Assn., Inc. 685 223 -
Salem Elementary School 675 93 -
Scwa, Ledyard Center Division 652 43 -
Lisbon Central School 620 41 -
Preston Plains Water Company 550 120 -
Lebanon Elementary School 525 686 -
Scwa, Chesterfield Division 524 2 -
C E Murphy School 520 217 -
Preston Veterans Memorial School 500 45 -
Kitemaug Orchard Association, Inc. 490 168 -
Scwa, Hillcrest Division (Hlc) 450 11 -
Ctwc - Shoreline Region-Masons Island 445 35 -
Ctwc - Bay Mountain 440 326 -
Lebanon Middle School 415 245 -
Lyman Memorial High School 412 122 -
Aquarion-Arlington Acres 392 88 -
Scwa, Robin Hill Division (Rbn) 388 6 -
Scwa, Cedar Ridge Division 370 116 -
Voluntown Elementary School 365 12 -
Aquarion-Pleasure Valley 328 30 -
Jewett City Water Co., S & W System 320 39 -
Classee Water System - Latimer Point 316 52 -
Pachaug Marina Campground 310 74 -
Church of Christ the King 305 0 -

Other Counties in Connecticut

Hartford County
219 systems · 836,032 served · 20,244 violations
Fairfield County
336 systems · 779,265 served · 42,084 violations
New Haven County
212 systems · 723,250 served · 17,543 violations
Litchfield County
345 systems · 117,396 served · 27,780 violations
Middlesex County
276 systems · 97,390 served · 25,593 violations
Windham County
255 systems · 63,884 served · 21,628 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in New London County? ▼
New London County has 34,737 total drinking water violations across 396 water systems, of which 4,536 are health-based violations. 91.4% of systems have at least one violation.
How many people get water from New London County systems? ▼
Water systems in New London County serve approximately 209,068 people through 396 public water systems.
Has PFAS been detected in New London County water? ▼
Of 8 water systems tested for PFAS in New London County, 5 had PFAS detected (62.5% detection rate).
What types of water sources supply New London County? ▼
Water systems in New London County use GW (35 systems), SW (15 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. 13.1% of New London 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.