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951 Connecticut water systems have inventoried 834,265 service lines for EPA. 7,993 (1.0%) are confirmed lead and 281,399 (34%) are still of unknown material. Below: every large or city-linked Connecticut utility ranked by lead lines.
Connecticut water systems reported 7,993 lead service lines and 5,180 galvanized lines requiring replacement as of Q2 2026 — 1.0% of the 834,265 lines inventoried and 0.4% of the national lead total, ranking #23 of 51. AQUARION-EASTERN FAIRFIELD COUNTY reports the most in the state (3,948).
AQUARION-EASTERN FAIRFIELD COUNTY (3,948), AQUARION-GREENWICH (1,553), WATERBURY WATER DEPARTMENT (952) lead the list; 35 Connecticut systems report at least one lead line in total.
Find your utility in the table below, then check its published service line inventory (most utilities post an address-lookup map) or call the number on your water bill. Utilities must notify customers whose line is lead, galvanized-requiring-replacement or unknown. You can also test the pipe entering your home: lead is soft, dull gray, non-magnetic and turns shiny when scratched.
Under EPA's Lead and Copper Rule Improvements, systems must replace lead and galvanized-requiring-replacement lines within 10 years starting in 2027; systems with very high counts can receive longer deadlines. Ask your utility for its replacement plan and whether it covers the homeowner-owned portion.
Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking, flush the tap after water has sat for hours, never use hot tap water for drinking or infant formula, and confirm your actual level with a certified lab test.
Source: EPA SDWIS Service Line Inventory, Q2 2026 snapshot (updated 2026-08-18). Counts are service lines, not people.
A certified mail-in lab test shows exactly what's in your water — lead plus dozens of other contaminants — with EPA-grade accuracy. Know your real levels before spending on a filter.
Certified lab · results in days
Community systems serving 50,000+ people plus systems linked to a city report on this site (20 shown). State totals above include every reporting system.
| # | Water system | Status | Lead | GRR | Unknown | Total lines | City report |
|---|---|---|---|---|---|---|---|
| 1 | AQUARION-EASTERN FAIRFIELD COUNTY CT0150011 · 351,756 served | Lead service lines present | 3,948 | 323 | 63,008 | 109,655 | |
| 2 | AQUARION-GREENWICH CT0570011 · 53,297 served | Lead service lines present | 1,553 | 133 | 13,162 | 17,609 | |
| 3 | WATERBURY WATER DEPARTMENT CT1510011 · 107,271 served | Lead service lines present | 952 | 128 | 0 | 27,905 | |
| 4 | NEW LONDON DEPT. OF PUBLIC UTILITIES CT0950011 · 27,620 served | Lead service lines present | 526 | 3 | 4,352 | 6,237 | |
| 5 | MIDDLETOWN WATER DEPARTMENT CT0830011 · 41,019 served | Lead service lines present | 257 | 0 | 884 | 11,069 | |
| 6 | NORWALK FIRST TAXING DISTRICT CT1030011 · 40,256 served | Lead service lines present | 91 | 104 | 4,700 | 11,042 | |
| 7 | CTWC - NORTHERN REG-WESTERN SYSTEM CT0473011 · 101,313 served | Lead service lines present | 34 | 97 | 15,886 | 39,336 | |
| 8 | REGIONAL WATER AUTHORITY CT0930011 · 418,900 served | Lead service lines present | 17 | 2,207 | 5,963 | 125,376 | New Haven → |
| 9 | NORWICH PUBLIC UTILITIES CT1040011 · 36,163 served | Lead service lines present | 12 | 1 | 176 | 11,089 | |
| 10 | MANCHESTER WATER DEPARTMENT CT0770021 · 51,198 served | Lead service lines present | 5 | 383 | 10,924 | 16,093 | |
| 11 | AQUARION-STAMFORD CT1350011 · 119,214 served | Lead service lines present | 4 | 112 | 15,227 | 22,061 | |
| 12 | GROTON UTILITIES CT0590011 · 30,200 served | Lead service lines present | 4 | 2 | 2,028 | 8,305 | Groton → |
| 13 | TORRINGTON WATER COMPANY CT1430011 · 37,915 served | Lead service lines present | 1 | 125 | 8,784 | 10,164 | |
| 14 | CTWC - NAUGATUCK REGION-CENTRAL SYSTEM CT0880011 · 22,735 served | Lead service lines present | 1 | 16 | 5,977 | 11,225 | |
| 15 | METROPOLITAN DISTRICT COMMISSION CT0640011 · 390,887 served | Lead service lines present | 0 | 43 | 14,029 | 104,807 | |
| 16 | DANBURY WATER DEPARTMENT CT0340011 · 62,055 served | Lead service lines present | 0 | 1 | 9,111 | 11,688 | Danbury → |
| 17 | NEW BRITAIN WATER DEPARTMENT CT0890011 · 73,534 served | Lead service lines present | 0 | 170 | 910 | 18,340 | |
| 18 | MERIDEN WATER DIVISION CT0800011 · 58,441 served | Lead service lines present | 0 | 30 | 417 | 21,217 | |
| 19 | HAZARDVILLE WATER COMPANY CT0490021 · 18,544 served | Lead service lines present | 0 | 22 | 220 | 7,307 | Enfield → |
| 20 | BRISTOL WATER DEPARTMENT CT0170011 · 52,079 served | No lead service lines reported | 0 | 0 | 0 | 17,286 |
A lead or unknown service line means lead can enter water after it leaves the treatment plant, so city-level test results understate what reaches your tap. Filter drinking and cooking water with an NSF/ANSI 53 lead-certified system, and see the lead in drinking water guide or Connecticut city water reports.
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