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Lead service lines in Greenwich, CT

Search 11,532 service line records published by 1 water utility for Greenwich.

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Service line status in Greenwich

906Lead
7.9%
29Galvanized requiring replacement
0.3%
5,939Lead status unknown
51.5%
4,652Non-lead
40.3%
6Not 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 Greenwich drinking water

Aquarion Water Company of Connecticut runs 3 public water systems connected with Greenwich (CT0150011, CT0570011, CT1350011); 3 have UCMR 5 results. We can't tell from the inventory which one serves a given address.

Aquarion Water Co of CT-Main System PWSID CT0150011

PFOA (highest result)
10.9 ppt above 4.0 ppt
PFOS (highest result)
6.6 ppt above 4.0 ppt
Other PFAS detected
PFBA 7.6 ppt, PFHxA 7.4 ppt, PFPeA 6.7 ppt, PFBS 4.1 ppt, PFHpA 3.9 ppt
PFAS detected
7 of 29 tested
Sampled
15 sample event(s), 5 sampling point(s), 2023-01-17 to 2024-02-20

Lead service line data on this page: Aquarion Water Company of Connecticut.

Aquarion Water Co of CT-Greenwich System PWSID CT0570011

PFOA (highest result)
5.6 ppt above 4.0 ppt
PFOS (highest result)
4.1 ppt above 4.0 ppt
Other PFAS detected
PFHxA 4 ppt, PFPeA 3.8 ppt
PFAS detected
4 of 29 tested
Sampled
15 sample event(s), 3 sampling point(s), 2024-10-07 to 2025-08-06

Lead service line data on this page: Aquarion Water Company of Connecticut.

Aquarion Water Co of CT-Stamford PWSID CT1350011

PFOA (highest result)
4.3 ppt above 4.0 ppt
PFOS (highest result)
Not detected (below the 4 ppt reporting level)
Other PFAS detected
PFPeA 3.1 ppt, PFHxA 3 ppt
PFAS detected
3 of 29 tested
Sampled
10 sample event(s), 2 sampling point(s), 2025-03-05 to 2025-12-15

Lead service line data on this page: Aquarion Water Company of Connecticut.

Other tested water systems that list Greenwich in their service area

These may or may not serve your address.

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 →

Flood insurance claim history in Greenwich

NFIP community: GREENWICH, TOWN OF (community ID 090008).

1,469NFIP claims since 1978
1,199claims with a payment
$38,886,840total paid

Claims by decade

DecadeClaimsPaid
1970s86$263,405
1980s136$235,590
1990s314$5,905,780
2000s181$2,628,658
2010s542$20,870,948
2020s210$8,982,459

Top flood years (by amount paid)

YearClaimsPaidFEMA event name
2012327$18,051,487Hurricane Sandy
2021181$8,505,305Hurricane Ida
1992218$4,993,726December Storm - Nor'Easter

Data covers losses from 1978 to 2026 (claims data as of 2026-09-07).

Historical statistics only. Counts cover claims filed under National Flood Insurance Program policies for properties in the NFIP community “GREENWICH, TOWN OF” (community ID 090008); they do not include uninsured damage or private flood insurance, and FEMA's data does not identify individual properties. Paid amounts are FEMA's building, contents and Increased Cost of Compliance payments as reported, not adjusted for inflation. This site is not an insurance agent, broker or advisor, and this is not a flood zone determination. For official flood maps, see the FEMA Flood Map Service Center.

Sources: Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: NFIP Redacted Claims - v3 (API endpoint; data refresh 2026-09-09), retrieved 2026-10-08; OpenFEMA Dataset: NFIP Community Status Book - v1 (API endpoint), retrieved 2026-10-08. Used under the OpenFEMA terms and conditions.

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

Data sources

Streets with the most lead or GRR records

StreetLeadGalvanized requiring replacementLead status unknownNon-lead
Hamilton Ave4106465
Water St3123439
Putnam Ave31010652
Connecticut Ave280820
High St241178
Davis Ave2003532
Richland Rd1911410
William St2001314
Pemberwick Rd17214849
Lake Ave1908859
Greenwich Ave1708985
Milbank Ave1616856
Maher Ave170238
Perryridge Rd160920
Old Church Rd1405212

What to do next

  1. 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.
  2. 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.
  3. 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.
  4. Use cold water. EPA: “Use only cold water for drinking, cooking and making baby formula. Remember, boiling water does not remove lead from water.”
  5. 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.