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Regency at Stow Condominiums

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
132 people
Connections
66
Water source
Groundwater
Based in
Stow, MA
County
Middlesex
Owner
Private
Hardness
Hard
The ZIP code it serves

01775

The short answer

1 result is above the health goal. The worst: Uranium, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Uranium, nitrate, total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, chromium (total) and fluoride: Massachusetts’s own results, samples taken from May 4, 2020 to April 29, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Uranium

Comes from the source

Above the health goal

15.2ppb

Highest yearly average, 2021 to 2024

Averaged by year, the highest was 15.2 ppb, in 2024: below EPA’s legal limit of 30 ppb, but above its health goal of zero. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 16.5 ppb, in 2016.

What handles it

Below EPA’s limits3

Nitrate

Comes from the source

Below EPA’s limits

3.0ppm

Highest sample; found in 7 of 7

2026, one sample: 2.6 ppm

The highest sample, in 2021, was 3.0 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 2.6 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 2.2 ppm, in 2019.

What handles it

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

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

4.6ppb

Highest yearly average, 2024 to 2025

2025, one sample: 4.5 ppb

Averaged by year, the highest was 4.6 ppb, in 2024, below EPA’s legal limit of 80 ppb. In 2025, the latest year on file, its one sample was 4.5 ppb.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

1.1ppb

Highest yearly average, 2024 to 2025

Averaged by year, the highest was 1.1 ppb, in 2025, below EPA’s legal limit of 60 ppb. That was also the latest year on file.

What handles it

No certification claim covers this compound yet.

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

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?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. How whole-house systems compare.

Filters with those claims on a certifier’s listing

None of the filters TapBuff has checked so far carry these claims. Search the certifier listings for the claim above.

Compare five-year costs

Hardness

Hard, 157 mg/L (9.2 grains per gallon), at its one sampling point, 2018 to 2026.

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 9.2 grains per gallon, salt includedSoftener or salt-free conditioner?Massachusetts water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Revised Total Coliform RuleE. coli was confirmed in the water system.EPA: Maximum Contaminant Level Violation, E. coli (RTCR)Aug. 1, 2023 to Aug. 31, 2023—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record.

What this report can’t tell you

  • Everything else. Uranium, nitrate, total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, chromium (total) and fluoride results here are Massachusetts’s own from 2020 on, with EPA’s national file for 2012 to 2019. Regency at Stow Condominiums’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 May 4, 2020 to April 29, 2026.

Testing your own tap

Regency at Stow Condominiums’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 Regency at Stow Condominiums serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Eurofins Ayer

    Ayer, MA · about 10 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (978) 391-4428

  • Pace Analytical LLC-Westborough

    Westborough, MA · about 12 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (508) 898-9220

  • Eurofins-Worcester

    Worcester, MA · about 16 miles

    Certified for bacteria

    (401) 461-7181

All 81 certified labs for Massachusetts

Sources

PWSID MA2286033. Rebuilt from EPA data on Oct. 18, 2026.

Also in Middlesex County

All Massachusetts utilities

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