Clinton, CT · PWSID CT0608011
CTWC - Shoreline Region-Guilford System lead service lines
200 lead or galvanized lines to replace
CTWC - Shoreline Region-Guilford System reported 129 lead and 71 galvanized-requiring-replacement service lines out of 18,580 in its inventory. That's about 1 in 93 lines. Another 3,618 (19%) are still listed as unknown material.
Ranks #9 of 71 Connecticut systems with confirmed lead lines, and #1,249 nationally.
1.1% of CTWC - Shoreline Region-Guilford System's service lines are lead or galvanized requiring replacement. That's lower than the Connecticut average (1.6%) and lower than the national average (3.1%).
- Lead 0.7%
- Galvanized (replace) 0.4%
- Unknown 19%
- Non-lead 79%
Total service lines reported: 18,580. Reported all required service line types. Population served: 33,975; 18,424 connections.
Lead test results
CTWC - Shoreline Region-Guilford System's most recent 90th-percentile lead result (2026) was not detected, below both the 15 ppb action level and the 10 ppb level that takes effect in 2027. This means 90% of homes sampled were at or below that level; individual homes, especially those with lead lines, can be higher.
Lead and Copper Rule 90th-percentile results reported to EPA, in parts per billion. Dashed lines: 15 ppb action level and the 10 ppb level from November 1, 2027.
Progress since 2025 Q1
Reported lead and galvanized-requiring-replacement lines went from 200 in 2025 Q1 to 200 in 2026 Q3: no change. Lines of unknown material went from 3,618 to 3,618, no change.
Quarterly counts reported to EPA. A drop usually means lines were replaced or confirmed non-lead; a rise usually means more lines were identified. Replacement progress rankings.
Lead rule violations
EPA's data lists no Lead and Copper Rule violations for CTWC - Shoreline Region-Guilford System since 2015. That covers testing, reporting, corrosion control and public notice requirements; it isn't a guarantee about any individual home.
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
CTWC - Shoreline Region-Guilford System's main water source is surface water (rivers, lakes or reservoirs). It buys treated water from Regional Water Authority, CTWC - Shoreline Region-Chester System. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while CTWC - Shoreline Region-Guilford System is responsible for its own service line inventory and replacement program. It sells water to 1 other water system: Regional Water Authority.
Source: EPA SDWIS water system and facility records.
Check your own address
These counts cover the whole system. To see whether your line is lead, use the utility's address-level inventory. Utilities had to prepare one by October 16, 2024 and make it publicly accessible; systems serving more than 50,000 people must post it online.
No map yet? Do the 2-minute scratch and magnet test on the pipe where water enters your home.
Protect your drinking water now
If your line is lead, galvanized or unknown, filter water for drinking, cooking and baby formula. Use a filter certified to NSF/ANSI 53 for lead. Run cold water for a few minutes after it sits for hours, and never use hot tap water for cooking.
How to pick a lead-certified filter · How to test your water for lead
Getting the line replaced
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask CTWC - Shoreline Region-Guilford System whether it replaces the private side for free or with a cost share before you hire anyone. If you want it done sooner, or your utility doesn't cover your side, a licensed plumber can quote it. What replacement costs.
County pages: Lead pipes in New Haven County
ZIP codes served
ZIP codes whose center falls inside CTWC - Shoreline Region-Guilford System's mapped service area (EPA service area boundaries). Neighboring utilities may serve parts of the same ZIP.
0641306475
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| Regional Water Authority | 2,224 | 5,963 |
| Waterbury Water Department | 1,080 | 0 |
| Meriden Water Division | 30 | 417 |
| CTWC - Naugatuck Region-Central System | 17 | 5,977 |
| Aquarion-Valley | 46 | 4,783 |
| Heritage Water Company | 2 | 1,106 |
| Aquarion-East Derby | 0 | 492 |
| Aquarion-Lakeside | 0 | 178 |
Check another water system
Questions
Does CTWC - Shoreline Region-Guilford System have lead pipes?
Yes. CTWC - Shoreline Region-Guilford System reported 129 lead service lines and 71 galvanized lines that must be replaced, out of 18,580 total. 3,618 more are of unknown material.
How do I check if my home's service line is lead?
Look up your address on CTWC - Shoreline Region-Guilford System's official service line inventory, which utilities must make publicly available. You can also scratch the pipe where it enters your home: lead is soft, dull gray, scratches to shiny silver and does not attract a magnet.
When will CTWC - Shoreline Region-Guilford System replace lead service lines?
Under EPA's Lead and Copper Rule Improvements, most systems must replace lead and galvanized-requiring-replacement lines by December 31, 2037, starting from November 1, 2027. The rule is being challenged in court, so dates could change. Many utilities run free or cost-share programs now.
Has CTWC - Shoreline Region-Guilford System had lead violations?
EPA's data shows no Lead and Copper Rule violations since 2015 for CTWC - Shoreline Region-Guilford System.
Which water filters remove lead?
Use a filter certified to NSF/ANSI Standard 53 for lead reduction, or NSF/ANSI 58 for reverse osmosis. Check the certification on NSF's listings, not just the box.
Embed or cite this data
Local news sites, blogs and community groups can embed this card. It updates when EPA releases new data.
Citation: Lead Pipe Map, "CTWC - Shoreline Region-Guilford System lead service lines," https://leadpipemap.com/ct/ctwc-shoreline-region-guilford-system/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.