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Mount St Marys Abbey

What EPA’s and Massachusetts’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
60 people
Connections
7
Water source
Groundwater
Based in
Wrentham, MA
County
Norfolk
Owner
Private
Hardness
Moderately hard
The ZIP code it serves

02093

The short answer

1 result is above EPA’s legal limit. The worst: Lead, above the action level. 18 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2002 to 2026.

Nitrate, fluoride, arsenic and chromium (total): Massachusetts’s own results, samples taken from Aug. 23, 2022 to Sept. 1, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Lead

Comes from pipes, often your own

Above the action level

15.6ppb

90th percentile, 2024 to 2026

In the latest period, 9 in 10 homes sampled were at or below 15.6 ppb, above EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027, and this result is at or above that. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits2

Nitrate

Comes from the source

Below EPA’s limits

3.0ppm

Highest sample; found in 4 of 5

2026, one sample: 3.0 ppm

The highest sample, in 2026, was 3.0 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its one sample was 3.0 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 3.1 ppm, in 2015.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.82ppm

Highest yearly average, 2023

Averaged by year, the highest was 0.82 ppm, in 2023, below EPA’s legal limit of 4.0 ppm. That is the only year on file.

What handles it

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best water filters for lead, ranked

Hardness

Moderately hard, 74 mg/L (4.3 grains per gallon), at its one sampling point, 2019 to 2025.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared at 4.3 grains per gallon, salt includedSoftener or salt-free conditioner?Massachusetts water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2021 to Dec. 31, 20218.9 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2021 to Sept. 30, 20218.5 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2021 to June 30, 20217.8 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2021 to March 31, 20216.9 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2020 to Dec. 31, 20206.8 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2020 to Sept. 30, 20206.1 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2020 to June 30, 20206.0 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2020 to March 31, 20206.9 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2019 to Dec. 31, 20197.0 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2019 to June 30, 20196.7 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2019 to March 31, 20196.1 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2018 to Dec. 31, 20186.4 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2018 to Sept. 30, 20186.5 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2018 to June 30, 20186.8 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2018 to March 31, 20186.1 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2017 to Dec. 31, 20176.6 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2017 to June 30, 20175.8 PCI/LResolved
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2017 to March 31, 20176.0 PCI/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 17 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Nitrate, fluoride, arsenic and chromium (total) results here are Massachusetts’s own from 2022 on, with EPA’s national file for 2012 to 2019. Mount St Marys Abbey’s own annual report, which it must send you every year, has the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Massachusetts’s results run from Aug. 23, 2022 to Sept. 1, 2026.

Testing your own tap

Mount St Marys Abbey’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Massachusetts certifies.

The 3 labs Massachusetts certifies closest to the area Mount St Marys Abbey serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Pace Analytical LLC-Mansfield-320 Forbes

    Mansfield, MA · about 8 miles

    Certified for lead and copper, metals, PFAS

    (508) 822-9300

  • Proverde Environmental, Inc.

    Milford, MA · about 11 miles

    Certified for PFAS

    (617) 221-3356

  • White Lodge Laboratory

    Westwood, MA · about 14 miles

    Certified for bacteria

    (781) 710-6498

All 81 certified labs for Massachusetts

Sources

PWSID MA4350003. Rebuilt from EPA data on Oct. 18, 2026.

Also in Norfolk County

All Massachusetts utilities

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