- Lead, 90th percentile: 5.9 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2025–Dec 31, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
What EPA records show for MWRA
EPA MA6000000 · serves Boston, MA · about 2,580,000 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
MWRA (EPA MA6000000)
What EPA records show for MWRA, as of October 14, 2026
We found no health-based violations in EPA's records for this system (MA6000000) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for MWRA (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 5.9 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2025–Dec 31, 2025). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
We found no PFAS results for this system (MA6000000) in EPA's UCMR 5 data, as of October 14, 2026.
Source: EPA UCMR 5 occurrence data. Data as of October 14, 2026.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does MWRA use chloramine?
EPA treatment records (state-reported) list chloramines for MWRA. EPA record
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)