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Lead service lines in Cos Cob, CT

Search 1,940 service line records published by 1 water utility for Cos Cob.

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Service line status in Cos Cob

156Lead
8.0%

15Galvanized requiring replacement
0.8%

1,041Lead status unknown
53.7%

726Non-lead
37.4%

2Not classified
0.1%

Counts are records in the utilities' published inventories (not people or buildings). One property can have more than one service line record.

PFAS in Cos Cob drinking water

Aquarion Water Company of Connecticut: no PFAS data found — we could not reliably match this town to one of the utility's water systems.

Source: EPA UCMR 5 final occurrence data (EPA page last updated 2026-08-28; samples collected January 2023 – December 2025) ↗. All PFAS results nationwide →

Data sources

Aquarion Water Company of Connecticut — 1,940 records, data as of 2026-10-05 (official map ↗)

Streets with the most lead or GRR records

Street	Lead	Galvanized requiring replacement	Lead status unknown	Non-lead
Orchard St	16	2	41	39
Valley Rd	13	3	92	72
Valleywood Rd	11	1	38	31
Butler St	12	0	13	10
Sinawoy Rd	12	0	23	17
Tremont St	12	0	4	3
Loughlin Ave	11	0	18	12
Kent Pl	9	1	5	4
Putnam Ave	9	0	16	10
River Rd	8	0	50	39
Cos Cob Ave	8	0	33	27
Meadow Dr	5	2	15	5
Cross Ln	6	0	21	6
Bible St	5	0	19	19
Strickland Rd	3	0	27	15

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Disclaimer: Information is copied from the utility's published service line inventory and may be incomplete, out of date, or contain errors.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.