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Connecticut Water Company: service line inventory lookup
109,580 service line records across 92 town(s), copied from the utility's published inventory.
Official inventory
Data as of
2026-09-30 (source layer last updated) · copied 2026-10-08
PWSID
Multiple public water systems (not listed in source)
Records excluded
0 (see methodology)
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Status breakdown
112Lead
0.1%
603Galvanized requiring replacement
0.6%
26,294Lead status unknown
24.0%
82,570Non-lead
75.4%
1Not classified
0.0%
PFAS (“forever chemicals”) in this utility's water systems
Connecticut Water Company runs many separate public water systems, and the inventory data does not say which system serves each address. These are its 10 systems with EPA UCMR 5 results; town pages and address results show the system(s) that serve each town where we can match them.
| System | Serves | PFOA max (ppt) | PFOS max (ppt) | PFAS detected |
|---|
| CTWC - Coventry Hills Div CT0320091 | Coventry | ND | ND | 0 |
| CTWC - Crystal System CT0690011 | Brooklyn, Killingly | 9.9 | 6.8 | 4 |
| CTWC - Naugatuck Reg-Collinsville Sys CT0230011 | Avon, Burlington, Canton and others | 4.9 | 5.6 | 2 |
| CTWC - Naugatuck Reg-Terryville System CT1110011 | Plymouth | ND | ND | 0 |
| CTWC - Naugatuck Reg-Thomaston System CT1400011 | Plymouth, Thomaston | ND | ND | 0 |
| CTWC - Naugatuck Region-Central System CT0880011 | Beacon Falls, Naugatuck, Prospect and others | ND | ND | 0 |
| CTWC - Northern Reg-Western System CT0473011 | East Granby, East Windsor, Ellington and others | 8 | 6 | 7 |
| CTWC - Shoreline Region-Chester System CT0261031 | Chester, Deep River, Essex | ND | ND | 0 |
| CTWC - Shoreline Region-Guilford System CT0608011 | Clinton, Guilford, Madison and others | 6 | 12 | 7 |
| CTWC - Unionville System CT0520011 | Avon, Bristol, Farmington and others | 6 | 6 | 6 |
ND = not detected (below the 4 ppt UCMR 5 reporting level).
UCMR 5 is a one-time EPA monitoring program, not a compliance determination. The values shown are the highest single sample result at any of the system's sampling points; one result above 4.0 ppt does not mean the system violates the PFAS rule, which is judged on running annual averages under separate compliance monitoring. Results describe the public water system, not an individual home.
In April 2024 EPA set enforceable limits (MCLs) of 4.0 ppt each for PFOA and PFOS, plus 10 ppt for PFHxS, PFNA and HFPO-DA (GenX) and a Hazard Index for mixtures, with compliance based on a running annual average at each sampling point and due in 2029 (EPA ↗). In May 2026 EPA proposed letting systems request two more years for PFOA/PFOS (to April 2031) and rescinding the PFHxS, PFNA, GenX and Hazard Index limits (EPA: extension proposal ↗ · EPA: rescission proposal ↗). These are proposals, not final rules, as of the date this page was built.
Source: EPA UCMR 5 final occurrence data (EPA page last updated 2026-08-28; samples collected January 2023 – December 2025) ↗. All PFAS results nationwide →
Towns served (in this dataset)
| Town | Records | Lead | Galvanized requiring replacement | Lead status unknown | Non-lead |
|---|
| Amston, CT | 235 | 0 | 2 | 111 | 122 |
| Ashford, CT | 124 | 0 | 0 | 87 | 37 |
| Avon, CT | 5,755 | 0 | 7 | 2,178 | 3,570 |
| Avon Avon Water, CT | 54 | 0 | 0 | 15 | 39 |
| Avon Collinsville, CT | 6 | 0 | 0 | 0 | 6 |
| Avon Naugatuck, CT | 5 | 0 | 0 | 0 | 5 |
| Avon Unionville, CT | 9 | 0 | 0 | 0 | 9 |
| Ballouville, CT | 115 | 0 | 0 | 56 | 59 |
| Beacon Falls, CT | 273 | 0 | 1 | 29 | 243 |
| Bolton, CT | 44 | 0 | 3 | 20 | 21 |
| Broad Brook, CT | 1,031 | 0 | 13 | 138 | 880 |
| Brooklyn, CT | 641 | 0 | 11 | 105 | 525 |
| Burlington, CT | 61 | 0 | 0 | 28 | 33 |
| Canton, CT | 1,076 | 0 | 2 | 92 | 982 |
| Centerbrook, CT | 169 | 1 | 5 | 39 | 124 |
| Central Village, CT | 42 | 0 | 0 | 19 | 23 |
| Chester, CT | 550 | 0 | 9 | 96 | 445 |
| Clinton, CT | 3,662 | 14 | 14 | 400 | 3,234 |
| Colchester, CT | 330 | 0 | 3 | 174 | 153 |
| Collinsville, CT | 564 | 0 | 21 | 281 | 262 |
| Columbia, CT | 32 | 0 | 1 | 12 | 19 |
| Coventry, CT | 955 | 7 | 7 | 325 | 616 |
| Danielson, CT | 1,792 | 0 | 57 | 279 | 1,456 |
| Dayville, CT | 371 | 0 | 1 | 145 | 225 |
| Deep River, CT | 668 | 12 | 13 | 96 | 547 |
| Durham, CT | 236 | 0 | 0 | 69 | 167 |
| East Granby, CT | 32 | 0 | 0 | 4 | 28 |
| East Haddam, CT | 3 | 0 | 0 | 2 | 1 |
| East Hampton, CT | 545 | 0 | 0 | 23 | 522 |
| East Windsor, CT | 2,142 | 0 | 8 | 401 | 1,733 |
| Ellington, CT | 4,188 | 1 | 0 | 479 | 3,708 |
| Enfield, CT | 8,870 | 0 | 79 | 2,908 | 5,883 |
| Essex, CT | 895 | 6 | 10 | 137 | 742 |
| Farmington, CT | 4,117 | 0 | 19 | 1,740 | 2,358 |
| Griswold, CT | 182 | 0 | 0 | 3 | 179 |
| Grosvenordale, CT | 49 | 0 | 0 | 22 | 27 |
| Guilford, CT | 3,675 | 21 | 12 | 365 | 3,277 |
| Haddam, CT | 124 | 0 | 0 | 60 | 64 |
| Hebron, CT | 283 | 0 | 0 | 51 | 232 |
| Ivoryton, CT | 353 | 7 | 6 | 43 | 297 |
| Killingly, CT | 39 | 0 | 1 | 2 | 36 |
| Killingworth, CT | 298 | 0 | 0 | 0 | 298 |
| Lebanon, CT | 181 | 0 | 1 | 55 | 125 |
| Madison, CT | 3,736 | 13 | 17 | 547 | 3,159 |
| Manchester, CT | 107 | 0 | 1 | 0 | 106 |
| Mansfield, CT | 19 | 0 | 0 | 0 | 19 |
| Mansfield Center, CT | 18 | 0 | 0 | 7 | 11 |
| Marlborough, CT | 136 | 0 | 0 | 0 | 136 |
| Middlebury, CT | 1,419 | 0 | 8 | 277 | 1,133 |
| Moodus, CT | 52 | 0 | 0 | 0 | 52 |
| Moosup, CT | 257 | 0 | 1 | 69 | 187 |
| Mystic, CT | 199 | 0 | 0 | 96 | 103 |
| Naugatuck, CT | 8,850 | 1 | 32 | 3,247 | 5,570 |
| North Grosvenordale, CT | 438 | 0 | 22 | 240 | 176 |
| Old Lyme, CT | 981 | 0 | 2 | 452 | 527 |
| Old Saybrook, CT | 5,046 | 4 | 13 | 644 | 4,385 |
| Oxford, CT | 1,087 | 0 | 1 | 111 | 975 |
| Pequabuck, CT | 78 | 0 | 2 | 42 | 34 |
| Plainfield, CT | 1,434 | 0 | 26 | 443 | 965 |
| Plymouth, CT | 142 | 0 | 0 | 20 | 122 |
| Portland, CT | 27 | 0 | 0 | 0 | 27 |
| Prospect, CT | 891 | 0 | 0 | 0 | 891 |
| Rogers, CT | 180 | 0 | 1 | 63 | 116 |
| Simsbury, CT | 89 | 0 | 0 | 24 | 65 |
| Somers, CT | 592 | 0 | 8 | 108 | 476 |
| South Lyme, CT | 435 | 0 | 0 | 221 | 214 |
| South Windsor, CT | 5,524 | 0 | 0 | 241 | 5,283 |
| Southbury, CT | 3,758 | 0 | 0 | 407 | 3,351 |
| Stafford Springs, CT | 1,210 | 1 | 7 | 474 | 728 |
| Stonington, CT | 78 | 0 | 0 | 5 | 73 |
| Storrs, CT | 552 | 0 | 2 | 301 | 249 |
| Storrs Mansfield, CT | 46 | 0 | 0 | 15 | 31 |
| Suffield, CT | 3,295 | 0 | 19 | 625 | 2,651 |
| Talcottville, CT | 28 | 0 | 0 | 16 | 12 |
| Terryville, CT | 2,493 | 0 | 34 | 846 | 1,613 |
| Thomaston, CT | 1,627 | 1 | 15 | 517 | 1,094 |
| Thompson, CT | 8 | 0 | 0 | 0 | 8 |
| Tolland, CT | 1,056 | 0 | 2 | 590 | 464 |
| Union City, CT | 330 | 0 | 0 | 182 | 148 |
| Unionville, CT | 1,963 | 0 | 6 | 635 | 1,322 |
| Vernon, CT | 7,891 | 18 | 6 | 1,626 | 6,241 |
| Voluntown, CT | 55 | 0 | 0 | 4 | 51 |
| Waterbury, CT | 283 | 0 | 0 | 48 | 235 |
| Wauregan, CT | 382 | 0 | 1 | 235 | 146 |
| Weatogue, CT | 161 | 0 | 0 | 79 | 82 |
| West Simsbury, CT | 18 | 0 | 0 | 11 | 7 |
| West Suffield, CT | 81 | 0 | 8 | 23 | 50 |
| Westbrook, CT | 2,463 | 4 | 16 | 403 | 2,040 |
| Willington, CT | 53 | 0 | 0 | 0 | 53 |
| Willington - Northern, CT | 5 | 0 | 0 | 1 | 4 |
| Windsor Locks, CT | 5,185 | 1 | 47 | 1,301 | 3,836 |
| Woodstock, CT | 46 | 0 | 0 | 9 | 37 |
What to do next
- Confirm with your utility. Inventories change as lines are inspected and replaced. The utility's official map and customer service line are the authoritative source.
- If your status is unknown, many utilities ask customers to report what they see where the water pipe enters the building. EPA's Protect Your Tap guide explains how to check.
- Consider testing. EPA: “Since you cannot see, taste, or smell lead dissolved in water, testing is the only sure way of telling whether there are harmful quantities of lead in your drinking water.” Your utility or state health department can point you to certified laboratories.
- Use cold water. EPA: “Use only cold water for drinking, cooking and making baby formula. Remember, boiling water does not remove lead from water.”
- Filters. EPA: “If you use a filter, make sure you use a filter certified to remove lead.” See EPA's consumer tool for filters certified to reduce lead.
Disclaimer: Information is copied from the utility's published service line inventory and may be incomplete, out of date, or contain errors. It is not a substitute for water testing and does not describe interior plumbing. Contact your water utility for the official status of your service line. Health information is limited to quotations from EPA and CDC.