Wrentham Developmental Center
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
- 937 people
- Connections
- 59
- Water source
- Groundwater
- Based in
- Wrentham, MA
- County
- Norfolk
- Owner
- State government
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. 3 health-based violations since 2016.
What was found
Nitrate, total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, chromium (total) and fluoride: Massachusetts’s own results, samples taken from May 11, 2020 to Aug. 4, 2026, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits3
Nitrate
Comes from the source
4.3ppm
Highest sample; found in 12 of 12
2026 average: 3.7 ppm
The highest sample, in 2025, was 4.3 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 3.7 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 3.5 ppm, in 2018.
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
22.1ppb
Highest yearly average, 2020 to 2026
2026 average: 0.72 ppb
Averaged by year, the highest was 22.1 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 34.2 ppb. In 2026, the latest year on file, its two samples averaged 0.72 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 23.5 ppb, in 2019.
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
10.3ppb
Highest yearly average, 2020 to 2026
2026: not found
Averaged by year, the highest was 10.3 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 10.5 ppb. In 2026, the latest year on file, it wasn’t found in any of its two samples. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 3.9 ppb, in 2018.
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
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Revised Total Coliform Rule | E. coli was confirmed in the water system.EPA: Maximum Contaminant Level Violation, E. coli (RTCR) | Dec. 1, 2024 to Dec. 31, 2024 | — | Resolved |
| Revised Total Coliform Rule | Coliform or E. coli results required a detailed review of the system, and it or its fixes were not done on time.EPA: Treatment Technique, Level 2 Assessment (RTCR) | Nov. 5, 2022 | — | Resolved |
| Revised Total Coliform Rule | Coliform results required a check of the system, and the check or its fixes were not done on time.EPA: Treatment Technique, Level 1 Assessment (RTCR) | Dec. 11, 2021 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 7 monitoring or reporting violations not shown. | ||||
What this report can’t tell you
Everything else. 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. Wrentham Developmental Center’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 11, 2020 to Aug. 4, 2026.
Testing your own tap
The 3 labs Massachusetts certifies closest to the area Wrentham Developmental Center 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
Proverde Environmental, Inc.
Milford, MA · about 10 miles
Certified for PFAS
White Lodge Laboratory
Westwood, MA · about 12 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
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID MA4350001. 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 reportWrentham Developmental Center 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