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Updated 2026-10-15
County water report

Norfolk County Water Quality: 18 Cities Ranked by the Records

Norfolk County, Massachusetts: 18 city reports 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 Norfolk 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.

Perfluorooctanesulfonic acid (PFOS)Detected in 14 systems of 18 tested4.0 ng/L federal MCL (2024) · US EPAHighest15 ng/L
Perfluorohexanesulfonic acid (PFHxS)Detected in 3 systems of 18 tested10 ng/L federal MCL (2024) · US EPAHighest29 ng/L
Perfluorooctanoic acid (PFOA)Detected in 16 systems of 18 tested4.0 ng/L federal MCL (2024) · US EPAHighest8.1 ng/L
Copper (90th percentile)Detected in 1 system1.3 mg/L federal action level · US EPAHighest1.37 mg/L
Lead (90th percentile)Detected in 16 systems of 18 tested15 µg/L federal action level · US EPAHighest7 µg/L
Perfluorobutanesulfonic acid (PFBS)Detected in 11 systems of 18 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest5.9 ng/L
Perfluorohexanoic acid (PFHxA)Detected in 14 systems of 18 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest7.1 ng/L
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)Detected in 1 system of 18 testedNo federal or state limit; shown for transparencyHighest3 ng/L
3 more contaminants detectedShow
Perfluorobutanoic acid (PFBA)Detected in 4 systems of 18 testedNo federal or state limit; shown for transparencyHighest16 ng/L
Perfluoroheptanoic acid (PFHpA)Detected in 2 systems of 18 testedNo federal or state limit; shown for transparencyHighest3 ng/L
Perfluoropentanoic acid (PFPeA)Detected in 14 systems of 18 testedNo federal or state limit; shown for transparencyHighest12 ng/L
21 substances tested, none detected in any systemShow

Tested in these 18 systems: BELLINGHAM DPW WATER SEWER DIVISION, BRAINTREE WATER AND SEWER DEPT., BROOKLINE WATER AND SEWER DIVISION, CANTON WATER DEPT, DEDHAM WESTWOOD WATER DIST., FOXBORO WATER DEPARTMENT, FRANKLIN WATER DEPARTMENT, HOLBROOK PUBLIC WORKS DEPT, MEDFIELD WATER DEPT., MEDWAY WATER DEPARTMENT, NEEDHAM WATER DEPT, RANDOLPH WATER DEPARTMENT, SHARON WATER DEPT, STOUGHTON WATER DEPARTMENT, WALPOLE WATER DEPT, WELLESLEY WATER DIVISION, WEYMOUTH WATER DEPARTMENT, WRENTHAM WATER DIVISION

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 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)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluorononanoic acid (PFNA)
  • Perfluoropentanesulfonic acid (PFPeS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
18 cities

Cities ranked by the records

Showing 6 of 18 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 Norfolk County15 of 18 city reports had a PFAS sample above a 2024 EPA limit
  1. Sharon15 ng/L
  2. Randolph13 ng/L
  3. Holbrook11.9 ng/L
  4. Braintree8.5 ng/L
  5. Stoughton7.1 ng/L
  6. Foxboro6.7 ng/L
  7. Medfield6.7 ng/L
  8. Wellesley6.6 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Massachusetts
Lead

0of 18 cities 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. BrooklineBROOKLINE WATER AND SEWER DIVISION · MA3046000
    63,191 served
  2. WeymouthWEYMOUTH WATER DEPARTMENT · MA4336000
    57,871 served
  3. DedhamDEDHAM WESTWOOD WATER DIST. · MA3073000
    41,630 served
  4. BraintreeBRAINTREE WATER AND SEWER DEPT. · MA4040000
    39,143 served
  5. RandolphRANDOLPH WATER DEPARTMENT · MA4244000
    35,114 served
  6. FranklinFRANKLIN WATER DEPARTMENT · MA2101000
    33,706 served
  7. NeedhamNEEDHAM WATER DEPT · MA3199000
    31,664 served
  8. WellesleyWELLESLEY WATER DIVISION · MA3317000
    29,550 served
  9. StoughtonSTOUGHTON WATER DEPARTMENT · MA4285000
    29,281 served
  10. WalpoleWALPOLE WATER DEPT · MA4307000
    24,070 served
Questions

Frequently asked

How does Norfolk County tap water compare across cities?

PurityMap ranks 18 cities in Norfolk 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 Brookline's main water system: BROOKLINE WATER AND SEWER DIVISION · PWSID MA3046000 · Purity Score 99 (Excellent) · Confidence: moderate · 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 Norfolk County cities had a PFAS sample above a 2024 EPA limit?

15 of 18 Norfolk County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Sharon (PFOS 15 ng/L), Randolph (PFOS 13 ng/L), Holbrook (PFOS 11.9 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 17.

Is there lead in Norfolk County tap water?

Utilities report lead as a 90th-percentile result from home taps. 16 of 18 Norfolk 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.

Have Norfolk County water systems had drinking-water violations?

1 city in Norfolk County has a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.

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