Public water system record
Lexington Water Dept. (MWRA)
Serves Lexington, Middlesex County, MA · 34,074 people served
Federal records show no health-based violations and 2 monitoring/reporting issues for Lexington Water Dept. (MWRA) in the last ten years. At least one of these issues remains unresolved.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 2
Key facts
- Lexington Water Dept. (MWRA) buys its water from MWRA.
- Most recent formal enforcement: compliance order (no penalty) by Massachusetts, March 2026.
- Record on file since 1991, with 7 health-based violations before October 19, 2016.
- Lead pipe inventory: 12 lead and 78 unknown out of 11,189 service lines.
Check whether Lexington Water Dept. (MWRA) 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.
None since October 2016.
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, 2025 |
Active
Enforcement action in place
|
|
Lead and Copper Rule
Monitoring and reporting
|
Jul 1, 2024 |
Active
Enforcement action in place
|
Full record since 1991
EPA's records for Lexington Water Dept. (MWRA) go back to 1991. Before October 19, 2016 they list 7 health-based violations (4 resolved, 3 archived by EPA without a recorded fix) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 7 | 0 |
| 2020s | 0 | 2 |
Most recent health-based violation before October 19, 2016: Lead and Copper Rule, began January 1999, Resolved.
Show all 7 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 1999 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 1994 | Archived |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 1994 | Resolved |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 1993 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 1992 | Archived |
|
Lead and Copper Rule
Treatment technique failure
|
Jan 1, 1992 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Aug 1, 1991 | Archived |
Enforcement actions
Massachusetts regulators took 4 formal enforcement actions against Lexington Water Dept. (MWRA) between 1993 and 2026. The most recent was a compliance order (no penalty) in March 2026.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 11, 2026 | Massachusetts | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| Feb 21, 2025 | Massachusetts | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| Feb 10, 2000 | Massachusetts | Compliance order (no penalty) | 1 violation (1 health-based): Lead and Copper Rule |
| Jun 29, 1993 | Massachusetts | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
Where the water comes from
Lexington Water Dept. (MWRA) buys its water from MWRA. It lists no wells or intakes of its own. 2 other community water systems buy water from Lexington Water Dept. (MWRA).
Buys water from
- MWRA Chelsea, MA
Community systems that buy water from it
- Bedford Water Dept. Bedford, MA
- Hanscom AFB Bedford, MA
Annual water quality report
Lexington Water Dept. (MWRA) 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