MA / Wellesley
MA · Tap water records
Wellesley tap water, in plain English
Here is what the EPA's own data shows about tap water in Wellesley. According to EPA SDWIS data retrieved June 2026, Wellesley is served by 3 active community water systems, together reported to serve about 32,630 people.
As of June 2026, EPA records show 7 violations across the community water system(s) serving Wellesley, going back to the earliest EPA record. 4 of these are classified by the EPA as health-based (a contaminant recorded above the limit the EPA tracks); the rest are monitoring or reporting violations. Each is listed by system below, with its status.
What the EPA has on record, by system
Wellesley Water Division
29,550 served · surface water · PWSID MA3317000 - Health-based Lead and Copper Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in January 1997. The EPA record for these does not include a measured level. All have since returned to compliance, per EPA records.
- Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in July 2022. EPA records do not show all of these as returned to compliance.
Wellesley College
3,000 served · groundwater · PWSID MA3317001 - Health-based Revised Total Coliform Rule: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded once in April 2016. The EPA record for these does not include a measured level. EPA records do not show all of these as returned to compliance.
- Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded 2 times between October 2006 and July 2023. EPA records do not show all of these as returned to compliance.
Northbrook Village Ii
80 served · groundwater · PWSID MA2028018 - Health-based Perchlorate: a health-based violation (a contaminant recorded above the limit the EPA tracks), recorded 2 times in July 2019. The EPA record lists a level of 3 UG/L; the limit (MCL) is 2 UG/L. EPA records do not show all of these as returned to compliance.
What this means
A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.
This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.
Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.