Enclave at Boxborough
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
- 100 people
- Connections
- 50
- Water source
- Groundwater
- Based in
- Boxborough, MA
- County
- Middlesex
- Owner
- Private
- Hardness
- Moderately hard
The ZIP code it serves
The short answer
1 result is above the health goal. The worst: Uranium, above the health goal. No health-based violations on file since 2016.
What handles itWhat was found
Uranium, nitrate, fluoride, arsenic and chromium (total): Massachusetts’s own results, samples taken from Jan. 14, 2021 to April 6, 2026.
Above the health goal1
Uranium
Comes from the source
4.4ppb
Highest yearly average, 2021
Averaged by year, the highest was 4.4 ppb, in 2021: below EPA’s legal limit of 30 ppb, but above its health goal of zero. That is the only year on file.
What handles it
- NSF/ANSI 58 look for “Uranium”
Below EPA’s limits2
Nitrate
Comes from the source
0.52ppm
Highest sample; found in 16 of 16
2026 average: 0.35 ppm
The highest sample, in 2026, was 0.52 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its three samples averaged 0.35 ppm.
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
0.13ppm
Highest yearly average, 2021 to 2025
Averaged by year, the highest was 0.13 ppm, in 2025, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Chromium (total)
- 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.”
- NSF/ANSI 58
Claim: Uranium
For: Uranium
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 costsHardness
Moderately hard, 61 mg/L (3.6 grains per gallon), at its one sampling point, 2021 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. There is 1 monitoring or reporting violation: a sample missed, late or not reported.
What this report can’t tell you
Everything else. Uranium, nitrate, fluoride, arsenic and chromium (total) results here are Massachusetts’s own from 2021 on, with EPA’s national file for 2012 to 2019. Enclave at Boxborough’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 Jan. 14, 2021 to April 6, 2026.
Testing your own tap
The 3 labs Massachusetts certifies closest to the area Enclave at Boxborough 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 6 miles
Certified for bacteria, nitrate, minerals and other inorganics
Pace Analytical LLC-Westborough
Westborough, MA · about 16 miles
Certified for bacteria, nitrate, minerals and other inorganics
Eurofins-Worcester
Worcester, MA · about 18 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
- 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 Nov. 30, 2021 to June 9, 2022, read Oct. 10, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID MA2037038. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Read up on UraniumWhat each one does to health, where it comes from, and the certification claim that addresses it.About Uranium
- Get the utility’s own reportEnclave at Boxborough 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
- Compare certified filtersWhat the filters certified for these results cost over five years, cartridges included.Compare five-year costs