Public water system record
Wilmington Water Dept
Serves Wilmington, Middlesex County, MA · 22,481 people served
Federal records show 1 health-based violation and 1 monitoring/reporting issue for Wilmington Water Dept in the last ten years. The most serious issue in this window was a resolved Revised Total Coliform Rule violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 1
- Unresolved
- 0
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 1
Key facts
- Wilmington Water Dept draws water from 11 wells (2 of them for emergency, seasonal or other part-time use).
- Most recent formal enforcement: compliance order (no penalty) by Massachusetts, September 2022.
- Record on file since 1991, with 4 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 7,675 service lines.
Check whether Wilmington Water Dept serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Revised Total Coliform Rule
Contaminant limit exceeded
|
110 | Sep 1, 2022 | Resolved | Yes |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 1, 2013 | Active |
Full record since 1991
EPA's records for Wilmington Water Dept go back to 1991. Before October 19, 2016 they list 4 health-based violations (1 resolved, 3 archived by EPA without a recorded fix) and 25 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 3 | 0 |
| 2000s | 1 | 2 |
| 2010 to October 18, 2016 | 0 | 23 |
| 2020s | 1 | 0 |
Most recent health-based violation before October 19, 2016: Nitrite (acute), began October 2002, Archived.
Show all 4 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrite (acute)
Contaminant limit exceeded
Measured 1.2 mg/L, federal limit 1 mg/L (1.2 times the limit)
|
Oct 1, 2002 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 1998 | Archived |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 1993 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 1991 | Archived |
Enforcement actions
Massachusetts regulators took 5 formal enforcement actions against Wilmington Water Dept between 2002 and 2022. The most recent was a compliance order (no penalty) in September 2022.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Sep 8, 2022 | Massachusetts | Compliance order (no penalty) | 1 violation (1 health-based): Revised Total Coliform Rule |
| Nov 9, 2010 | Massachusetts | Compliance order (no penalty) | 21 violations: Vinyl chloride, CHLOROBENZENE, o-Dichlorobenzene, trans-1,2-Dichloroethylene, cis-1,2-Dichloroethylene |
| Dec 5, 2008 | Massachusetts | Compliance order (no penalty) | 1 violation: Total Coliform |
| Oct 23, 2007 | Massachusetts | Compliance order (no penalty) | 1 violation: Nitrite |
| Oct 24, 2002 | Massachusetts | Compliance order (no penalty) | 1 violation (1 health-based): Nitrite |
What the violations mean
Revised Total Coliform Rule
1 incidentThe system did not meet a requirement of the Revised Total Coliform Rule
Coliform and E. coli rules protect against bacteria in the distribution system
Where the water comes from
Wilmington Water Dept draws water from 11 wells (2 of them for emergency, seasonal or other part-time use). It also buys water from MWRA. 1 smaller public system such as schools, businesses or campgrounds buys water from Wilmington Water Dept.
Buys water from
- MWRA Chelsea, MA
Annual water quality report
Wilmington Water Dept must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Massachusetts.
Certified drinking water labs by state EPA guidance for private wells