Maillet Woods 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
- 55 people
- Connections
- 15
- Water source
- Groundwater
- Based in
- Hopkinton, MA
- County
- Middlesex
- Owner
- Private
- Hardness
- Soft
The ZIP code it serves
The short answer
Nothing in EPA’s and Massachusetts’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.
What was found
Fluoride, nitrate, arsenic, chromium (total) and uranium: Massachusetts’s own results, samples taken from April 28, 2020 to June 22, 2026, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits2
Fluoride
Forms or is added in treatment
0.91ppm
Highest yearly average, 2021 to 2024
Averaged by year, the highest was 0.91 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.4 ppm, in 2015.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Nitrate
Comes from the source
0.19ppm
Highest sample; found in 6 of 7
2026, one sample: 0.18 ppm
The highest sample, in 2021, was 0.19 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its one sample was 0.18 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.22 ppm, in 2016.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Chromium (total)
- Lead
- Uranium
Hardness
Soft, typically 0.9 mg/L (0.1 grains per gallon), across 2 sampling points, 2016 to 2022.
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.
Violations since 2016
No health-based violations on file with EPA since 2016.
What this report can’t tell you
Everything else. Fluoride, nitrate, arsenic, chromium (total) and uranium results here are Massachusetts’s own from 2020 on, with EPA’s national file for 2012 to 2019. Maillet Woods 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 April 28, 2020 to June 22, 2026.
Testing your own tap
The 3 labs Massachusetts certifies closest to the area Maillet Woods Condominiums serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Proverde Environmental, Inc.
Milford, MA · about 5 miles
Certified for PFAS
Pace Analytical LLC-Westborough
Westborough, MA · about 5 miles
Certified for bacteria, nitrate, minerals and other inorganics
Eurofins-Worcester
Worcester, MA · about 14 miles
Certified for bacteria
Sources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Massachusetts Department of Environmental Protection, Drinking Water Program, results from Jan. 2, 2020 to Oct. 5, 2026, read Oct. 8, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: MassDEP Online Searchable Laboratory Certification Listing, potable water, read Oct. 16, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Hardness: Massachusetts Department of Environmental Protection, Drinking Water Program, results from May 2, 2016 to June 22, 2022, read Oct. 10, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID MA2139011. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and Massachusetts’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportMaillet Woods Condominiums must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded