County · Connecticut

New Haven County, Connecticut: drinking water records

Name: Drinking water records for New Haven County, Connecticut
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 31 community water systems across 41 ZIP codes in New Haven County, then find water-testing resources and available recent monitoring-station readings.

In focus31Community water systems

Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

Drinking-water records

EPA survey and compliance records are historical reports. UCMR 5 results are available for 9 of the 31 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

systems with a health-based violation since 2016

System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.

Water systems in this county

All 31 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.

Water system	People served	PFAS survey results	PFAS found	Health-based violations	Lead, 9 in 10 homes at or below
Meriden Water Division CT0800011	58,441	566	7	1	0 ppbbelow the action level
Regional Water Authority CT0930011	418,900	900	4	0	0 ppbbelow the action level
Waterbury Water Department CT1510011	107,271	120	0	0	4 ppbbelow the action level
Wallingford Water Department CT1480011	37,267	240	3	0	0 ppbbelow the action level
Ctwc - Shoreline Region-Guilford System CT0608011	33,975	660	7	0	0 ppbbelow the action level
Ctwc - Naugatuck Region-Central System CT0880011	22,735	120	0	0	0 ppbbelow the action level
Aquarion-Valley CT1240011	13,080	300	6	0	1.1 ppbbelow the action level
Heritage Water Company CT1300021	7,300	120	2	0	0.7 ppbbelow the action level
Blue Trails Water Association CT0990011	224	0	0	2	2.4 ppbbelow the action level
Countryside Apartments CT1662051	218	0	0	1	5.6 ppbbelow the action level
Crestview Condominium Association CT0251021	84	0	0	1	0 ppbbelow the action level
Northford Glen Condominium Association CT0990031	84	0	0	2	0 ppbbelow the action level
Aquarion-Woodrich Village CT1666011	72	60	5	0	1.6 ppbbelow the action level
Oakdale Manor Water Association CT1300071	40	0	0	3	0 ppbbelow the action level
Wolcott Water Department CT1661423	2,550	0	0	0	0 ppbbelow the action level
Ctwc - Legend Hill System CT0765101	1,368	0	0	0	0 ppbbelow the action level
Aquarion-East Derby CT0378011	1,101	0	0	0	0 ppbbelow the action level
Southbury Training School CT1300011	816	0	0	0	1.8 ppbbelow the action level
Quonnipaug Hills - Main System CT0600041	564	0	0	0	2.8 ppbbelow the action level
Harmony Acres Mobile Home Park CT1150031	465	0	0	0	1.4 ppbbelow the action level
Aquarion-Lakeside CT1300031	455	0	0	0	0 ppbbelow the action level
Aquarion-Oxford Towne Center CT1085061	449	0	0	0	0 ppbbelow the action level
Arrowhead By the Lake Association, INC. CT1669011	288	0	0	0	1 ppbbelow the action level
Aquarion-Clearview Hills CT1668011	215	0	0	0	2.3 ppbbelow the action level
Bethany Mobile Home Park CT0081011	138	0	0	0	0 ppbbelow the action level
Idleview Mobile Home Park CT0880031	138	0	0	0	0 ppbbelow the action level
Aquarion-Hawkstone CT1080011	120	0	0	0	0 ppbbelow the action level
Ctwc - Green Springs System CT0760021	104	0	0	0	3.3 ppbbelow the action level
Aquarion-West Shore CT0819061	100	0	0	0	0 ppbbelow the action level
Middlebury Commons CT0815051	76	0	0	0	6 ppbbelow the action level
Quonnipaug Hills - Section I CT0606011	27	0	0	0	0 ppbbelow the action level

USGS · Monitoring stations

The water, more recently.

Available station readings in New Haven County, Connecticut. Each measurement keeps its time, unit and original source.

These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.

Recent observations load when this section comes into view.

How these readings update

We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.

Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.

Your next step

Water testing, reports & local help.

Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.

Official national directories

Water testing

Find your state’s private-well program

EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-05

Water testing

Find a certified drinking-water laboratory

Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-11

Public records

Find your utility’s Consumer Confidence Report

EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-09-09

Public records

Explore USGS water observations

Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.

U.S. Geological Survey
Source reviewed 2026-09-15

A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.

Understand water testing and laboratory reports

Resource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction

Explore your area

Local coverage in New Haven County

41ZIP areas in this overview

Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.

Towns and communities

Ansonia
Branford Center
Cheshire Village
Derby
East Haven
Guilford Center
Heritage Village
Madison Center
Meriden
Milford
Naugatuck
New Haven
North Haven
Northford
Orange
Quinnipiac University
Wallingford Center
Waterbury
West Haven

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

06401Ansonia
06403
06405Branford Center
06410Cheshire Village
06418Derby
06437Guilford Center
06443Madison Center
06450Meriden
06451Meriden
06460Milford
06461Milford
06471
06472Northford
06473North Haven
06477Orange
06478
06483
06488Heritage Village
06492Wallingford Center
06510New Haven
06511New Haven
06512East Haven
06513New Haven
06514New Haven
06515New Haven
06516West Haven
06517
06518Quinnipiac University
06519New Haven
06524
06525
06702Waterbury
06704Waterbury
06705Waterbury
06706Waterbury
06708Waterbury
06710Waterbury
06712
06716
06762Naugatuck
06770Naugatuck

These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.

Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.

Beyond this county page

Keep reading. Compare nearby.

PFASChoosing a PFAS filterPFAS was found in 7 of the 9 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter11 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near New Haven County

All Connecticut counties

Sources and scope

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.

Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.