Well water in Mashpee, Massachusetts

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Testing strongly recommended

tested well samples in Mashpee exceeded the EPA limit for PFOS (4 ng/L), based on public data from USGS Water Quality Portal.

380 test results across 12 contaminants from at least 59 wells, 1972 to 2020; chloride has the most at 88. Data refreshed September 3, 2026.

Compiled by Nick at Well Water Nerd from public records. How these pages are built

What individual samples found

Each row summarizes every public sample for that contaminant inside Mashpee. Above limit means above the EPA maximum contaminant level; where EPA has no enforceable limit, the row shows a health guideline or nuisance level instead.

Contaminant	Above limit	Samples	Detected	Median	Highest	Limit
PFOS 2020	75%	59	80%	63	610	4 ng/L EPA limit
PFOA 2020	56%	59	73%	7.3	90	4 ng/L EPA limit
Nitrate 1972 to 2016	0%	69	91%	0.2	6.2	10 mg/L EPA limit
Chloride 1972 to 2016	no limit	88	100%	14	16,000	250 mg/L nuisance level
Sodium 1972 to 2016	no limit	62	100%	10	21	20 mg/L health guideline
Iron 1975 to 2016	no limit	15	60%	50	19,000	300 ug/L nuisance level
Manganese 1975 to 2016	no limit	10	70%	80	2,200	300 ug/L health guideline

Sampled fewer than 10 times, too few to summarize: Copper (6), Fluoride (6), Arsenic (2), Uranium (2), Lead (2).

Closer than the town

See the sampled wells near your address

The same records, drawn around one point: which wells within a few miles were sampled and what they found, how deep the wells next to you were drilled, and any leaking tank or cleanup site within a mile.

Check my address

What this means

The contaminants most often above their limit here are pfos (75% of 59 samples) and pfoa (56% of 59 samples). A well next door can differ sharply from yours because bedrock fractures, well depth and plumbing all matter, so these rates describe the area, not your tap.

Chloride, Iron, and Manganese are widespread in local groundwater. They are mainly a staining and taste problem, but high manganese also carries a health advisory for infants.

What to test for in Mashpee

1
PFOS
75% of 59 local samples were above the limit.
2
PFOA
56% of 59 local samples were above the limit.
3
Coliform bacteria
Recommended for every private well, every year.
4
Nitrate
Recommended for every private well, especially near farms or septic systems.
5
Chloride
Detected in 100% of local samples.
6
Manganese
Detected in 70% of local samples.
7
Copper
Detected in 67% of local samples.
8
PFAS
1 unlined landfill on record locally.
9
Volatile organic compounds (VOCs)
1 unlined landfill on record locally.
10
Metals panel
3 hazardous waste sites on record locally.

Test your Mashpee well for PFOS, PFOA and coliform bacteria

Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.

Order the Tap Score well water test kit, from $209 Already tested? Upload the report

Just want bacteria checked first? Tap Score coliform and E. coli test, $99. Coliform and E. coli are the tests every well needs every year.

Want a quick look before paying for a lab? Home well water test strips on Amazon check hardness, iron, pH and nitrate in minutes. They are a screen, not a result: arsenic, bacteria, uranium and PFAS need a certified lab.

Affiliate links: the merchant pays us a commission and the price is the same for you. It does not change what the data above says. As an Amazon Associate we earn from qualifying purchases.

Where to get a well tested in Massachusetts: certified labs, state programs and prices.

Already have results back? Get your lab report read against the Mashpee numbers, $29. Every line explained, ranked by what matters, with the fix for each.

Wells in Mashpee

754 domestic wells in Mashpee are on record with the state since 1914. <1% are drilled into bedrock, and the typical well is 53 feet deep (one in ten goes past 78 feet).

In a typical Mashpee well, bedrock starts about 0 feet down, the median yield is 15 gallons per minute.

1910s

1970s

119

1980s

480

1990s

122

2000s

2010s

Find your own well's report

The state keeps the driller's report for most wells drilled since 1984. It tells you how deep your well is, where bedrock starts, and how much water it makes, which decides what treatment can work.

Open MassDEP Well Location Viewer and choose Water Well.
The completion report lists total depth, depth to bedrock, static water level, yield and the driller.

Drillers have filed completion reports with the state since 1984; the viewer's public copy is refreshed a few times a year.

The rock under Mashpee

Not a principal aquifer

The USGS map places this area outside any principal aquifer, which usually means wells here draw from fractured bedrock or thin local deposits rather than a large regional aquifer. Bedrock wells of that kind are where arsenic, radon and uranium turn up, and yields vary from well to well.

Classification from the USGS Principal Aquifers of the United States (national map, 2003 edition, GIS release 2015), read at the town centroid. A single well can sit in a different unit, especially near a boundary.

Official help in Massachusetts

Two places to start that are not selling anything: the state program that answers private well questions, and its list of labs certified to run drinking water tests. A certified lab is the difference between a result you can act on and a number.

Private Wells, MassDEP
Certified Laboratories, MassDEP

Contamination sources on record in Mashpee

MassDEP records 1 unlined landfill and 3 hazardous waste sites in Mashpee, among 12 regulated sites in total. Groundwater does not follow property lines, so a well within a few hundred feet of one of these is worth testing for what that site could release.

1: unlined landfillOlder unlined landfills are a leading source of PFAS, VOCs and metals in nearby wells.
3: hazardous waste sitesSolvents, degreasers and metals from industrial sites can travel far in fractured bedrock.
7: registered underground storage tank sitesRegistered tanks are regulated and inspected; they matter most when they are old or near a shallow well.
1: other remediation project

Treatment that fits the local profile

PFOS

Granular activated carbon whole-house; Point-of-use reverse osmosis; Anion exchange

PFOA

Granular activated carbon whole-house; Point-of-use reverse osmosis; Anion exchange

Manganese

Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis

Iron

Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration

Systems we would look at first

Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.

For PFOS

Under-sink reverse osmosis system

under-sink or countertop, about $300

Look for NSF/ANSI 58 certification listing the contaminant you need removed.

For PFOS

Whole-house PFAS carbon system

whole-house, at the point of entry, about $3,000

Granular activated carbon certified to NSF/ANSI 53 for PFOA and PFOS; replace media on schedule.

For PFOS

Aquasana SmartFlow reverse osmosis

under-sink or countertop, about $225

Certified to NSF/ANSI 58 and 53 to reduce arsenic (96%, pentavalent), fluoride (90%), lead (99%), nitrate, nitrite and PFOA/PFOS at the kitchen tap, with a remineralizer.

For PFOA

Aquasana Claryum 3-Stage under-sink filter

under-sink or countertop, about $175

Certified to NSF/ANSI 53 to reduce 99% of lead and 99.7% of PFOA and PFOS at the tap. Not a fix for arsenic, nitrate or bacteria.

For PFOA

Aquasana HealthShield whole-house filter

whole-house, at the point of entry, about $2,099

Whole-house carbon system the maker certifies to reduce PFAS (PFOA and PFOS) and VOCs at every tap; a UV option adds bacteria protection.

For iron

Iron and manganese oxidizing filter

whole-house, at the point of entry, about $1,800

Air-injection or greensand media; fixes staining at the source.

Free, no obligation

Get on the list for a free in-home water test in Mashpee

No water treatment company serves Mashpee through Well Water Nerd yet. We are signing licensed companies on county by county: they test at your tap for free, walk you through the numbers, and quote treatment only if something needs fixing. Leave your details and you are first in line. Nothing is shared until a company joins for Mashpee, and you get an email naming it first.

Common questions

How deep are wells in Mashpee?

The typical domestic well in Mashpee is 53 feet deep, based on 754 wells reported to the state since 1914. One in ten is deeper than 78 feet. <1% are drilled into bedrock.

How often should I test a private well in Mashpee?

Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.

Towns near Mashpee

Closest first. Groundwater does not stop at a line on a map, so the next town over is a fair second opinion.

Want the numbers themselves? Download the Massachusetts dataset as CSV, every county and town, with the sources named.

Sources

USGS Water Quality Portal: 380 samples in Mashpee. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
MassDEP well completion reports: 1,202 well records in Mashpee, 754 domestic. Well completion reports filed with the Massachusetts Department of Environmental Protection, as published in the Well Location Viewer (April 2023 vintage). Only aggregates are shown; owner names and addresses are never stored. Retrieved September 16, 2026.
MassDEP regulated sites: 12 regulated sites located in Mashpee. Chapter 21E release sites, solid waste landfills and underground storage tank facilities from the Massachusetts Department of Environmental Protection, through MassGIS. Retrieved September 16, 2026.

Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.