County · Massachusetts

Barnstable County, Massachusetts: drinking water records

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

Explore EPA records for 30 community water systems across 47 ZIP codes in Barnstable County, then find water-testing resources and available recent monitoring-station readings.

In focus30Community 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 20 of the 30 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 30 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
Falmouth Water Dept MA4096000	97,551	306	0	1	1.1 ppbbelow the action level
Yarmouth Water Department MA4351000	38,900	899	5	1	1.5 ppbbelow the action level
Otis Air National Guard Base MA4096001	6,000	60	0	2	1.5 ppbbelow the action level
Dennis Water District MA4075000	65,000	540	2	0	0 ppbbelow the action level
Centerville Osterville Marstons Mills WD MA4020002	50,000	900	5	0	2.4 ppbbelow the action level
Harwich Water Department MA4126000	39,144	300	0	0	0 ppbbelow the action level
Mashpee Water District MA4172039	36,922	360	1	0	1.4 ppbbelow the action level
Brewster Water Department MA4041000	35,000	300	0	0	3.4 ppbbelow the action level
Hyannis Water System, Town of Barnstable MA4020004	35,000	180	3	0	0 ppbbelow the action level
Chatham Water Department MA4055000	30,000	300	0	0	1.1 ppbbelow the action level
Sandwich Water District MA4261000	23,000	600	0	0	0 ppbbelow the action level
Bourne Water District MA4036000	22,500	390	3	0	4.4 ppbbelow the action level
Provincetown Water Department MA4242000	22,250	120	0	0	2 ppbbelow the action level
Orleans Water Department MA4224000	17,460	120	0	0	0 ppbbelow the action level
Buzzards Bay Water District MA4036001	7,700	300	0	0	1 ppbbelow the action level
Town of Eastham MA4086095	6,199	120	0	0	0 ppbbelow the action level
Barnstable Fire District MA4020000	5,400	180	6	0	1.4 ppbbelow the action level
Cotuit Fire District Water Department MA4020003	4,938	300	0	0	3.1 ppbbelow the action level
North Sagamore Water District MA4036002	4,668	120	2	0	1 ppbbelow the action level
Wellfleet Municipal Water System MA4318094	750	0	0	1	3 ppbbelow the action level
Upper Cape Regional Water Cooperative MA4261024	56,250	180	0	0	not reported
Barnstable County Jail MA4036015	600	0	0	0	5 ppbbelow the action level
Sea Oaks Condominiums MA4172033	222	0	0	0	1.4 ppbbelow the action level
Pleasant Water MA4318091	200	0	0	0	1.9 ppbbelow the action level
Harborside Village MA4318040	165	0	0	0	3 ppbbelow the action level
Schooner Pass Trustees Condominiums MA4036011	136	0	0	0	3.5 ppbbelow the action level
Massasoit Hills Trailer Park MA4318056	120	0	0	0	9.3 ppbbelow the action level
Beechwood Point Condos MA4172035	112	0	0	0	0 ppbbelow the action level
Stones Throw Condos MA4300040	80	0	0	0	0 ppbbelow the action level
Wellfleet Apartments MA4318107	48	0	0	0	0 ppbbelow the action level

USGS · Monitoring stations

The water, more recently.

Available station readings in Barnstable County, Massachusetts. 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 Barnstable County

47ZIP 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

Barnstable Town
Brewster
Buzzards Bay
Chatham
Dennis
Dennis Port
East Dennis
East Falmouth
East Harwich
East Sandwich
Forestdale
Harwich Port
Monument Beach
New Seabury
North Eastham
North Falmouth
Northwest Harwich
Orleans
Pocasset
Provincetown
Sagamore
Sandwich
South Dennis
South Yarmouth
West Dennis
West Falmouth
West Yarmouth
Yarmouth Port

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

02532Buzzards Bay
02534Pocasset
02536East Falmouth
02537East Sandwich
02540West Falmouth
02542
02553Monument Beach
02556North Falmouth
02559Pocasset
02561Sagamore
02562Sagamore
02563Sandwich
02601Barnstable Town
02630Barnstable Town
02631Brewster
02632Barnstable Town
02633Chatham
02635Barnstable Town
02637Barnstable Town
02638Dennis
02639Dennis Port
02641East Dennis
02642North Eastham
02643
02644Forestdale
02645East Harwich
02646Harwich Port
02647Barnstable Town
02648Barnstable Town
02649New Seabury
02650
02652
02653Orleans
02655Barnstable Town
02657Provincetown
02659
02660South Dennis
02663
02664South Yarmouth
02666
02667
02668Barnstable Town
02670West Dennis
02671Northwest Harwich
02672Barnstable Town
02673West Yarmouth
02675Yarmouth Port

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 8 of the 20 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter23 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 Barnstable County

All Massachusetts 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.