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Updated 2026-09-16
County water report

Suffolk County Water Quality

Suffolk County, Massachusetts: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Suffolk County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Lead (90th percentile)BOSTON WATER AND SEWER COMMISSION (MWRA)15 µg/L federal action level · US EPA5.8 µg/L
Haloacetic acids (HAA5)BOSTON WATER AND SEWER COMMISSION (MWRA)60 ppb federal MCL · US EPA15.8 ppb
Total trihalomethanes (TTHM)BOSTON WATER AND SEWER COMMISSION (MWRA)80 ppb federal MCL · US EPA16.1 ppb
FluorideBOSTON WATER AND SEWER COMMISSION (MWRA)4.0 mg/L · US EPA0.71 mg/L
CopperBOSTON WATER AND SEWER COMMISSION (MWRA)1.3 mg/L (action level) · US EPA0.097 mg/L
NitrateBOSTON WATER AND SEWER COMMISSION (MWRA)10 mg/L · US EPA0.64 mg/L
30 substances tested, none detected in this systemShow

Tested in this system: BOSTON WATER AND SEWER COMMISSION (MWRA)

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • Lithium
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorobutanesulfonic acid (PFBS)
  • Perfluorobutanoic acid (PFBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluoroheptanoic acid (PFHpA)
  • Perfluorohexanesulfonic acid (PFHxS)
  • Perfluorohexanoic acid (PFHxA)
  • Perfluorononanoic acid (PFNA)
  • Perfluorooctanesulfonic acid (PFOS)
  • Perfluorooctanoic acid (PFOA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluoropentanoic acid (PFPeA)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
1 city

Cities ranked by the records

  • 1
    BostonBOSTON WATER AND SEWER COMMISSION (MWRA)
    No PFAS detectedLead below action level
    Open city report →
Showing 1 of 1 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Suffolk CountyPFAS detected in 0 of 1 city; none above a federal limit
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Massachusetts
Lead

0of 1 city above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Massachusetts
Who supplies the county

Largest water systems

  1. BostonBOSTON WATER AND SEWER COMMISSION (MWRA) · MA3035000
    675,647 served
Questions

Frequently asked

How does Suffolk County tap water compare across cities?

PurityMap ranks 1 city in Suffolk County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Boston's main water system: BOSTON WATER AND SEWER COMMISSION (MWRA) · PWSID MA3035000 · Purity Score 74 (Fair) · Confidence: high · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Suffolk County cities have PFAS above the federal limit?

None of the 1 Suffolk County cities on record had a regulated PFAS above the 2024 federal limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 0.

Is there lead in Suffolk County tap water?

Utilities report lead as a 90th-percentile result from home taps. 1 of 1 Suffolk County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

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