States › Massachusetts › Plymouth County

Plymouth County, MA Water Quality

Water quality data for 23 public water systems serving Plymouth County, Massachusetts — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 23 water systems · 28 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Plymouth County Earns a B

Plymouth County: 28 communities across 23 water systems. 100.0% have no open violations.

  • Median lead where detected: 3.00 ppb
  • 27 communities with a lead detection, 1 reporting none detected
  • 12 communities with PFAS above the federal limit
  • 2 with significant inspection deficiencies
  • 100.0% of communities have no open violations
3 ppb
Median Lead Level
County-wide, 90th percentile
23
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Plymouth
    2.50 ppb
    No federal limits exceeded on record
    A
  • Whitman
    Not detected
    No federal limits exceeded on record
    A
  • Lakeville
    1.80 ppb
    No federal limits exceeded on record
    A
  • Pembroke
    3.00 ppb
    1 health-based violation since 2015
    A
  • West Bridgewater
    1.00 ppb
    1 health-based violation since 2015
    A
⚠ Needs Attention
  • Bridgewater Town
    3.00 ppb
    PFAS above the limit at 3 of 3 sampling points
    D
  • Rockland
    4.00 ppb
    PFAS above the limit at 1 of 3 sampling points
    D
  • Abington
    4.00 ppb
    PFAS above the limit at 1 of 3 sampling points
    D
  • Middleborough
    3.00 ppb
    PFAS above the limit at 3 of 10 sampling points
    D
  • Marshfield
    4.00 ppb
    PFAS above the limit at 4 of 15 sampling points
    C
County Lead Level — Median 3 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 3 ppb — 20% of the federal action level
Systems by Lead Level
Under 5 ppb
25
5 – 10 ppb
2
No Data
1

All Cities in Plymouth County

Brockton 4.00 ppb B
Plymouth 2.50 ppb A
Bridgewater Town 3.00 ppb D
Marshfield 4.00 ppb C
Hingham 1.00 ppb A
Middleborough 3.00 ppb D
Wareham 2.00 ppb B
Scituate 2.00 ppb C
Pembroke 3.00 ppb A
Rockland 4.00 ppb D
Abington 4.00 ppb D
Duxbury 4.40 ppb C
Whitman Not detected A
Hanover 4.00 ppb C
East Bridgewater 1.00 ppb C
Kingston 1.00 ppb B
Norwell 4.00 ppb C
Hull 1.00 ppb A
Hanson 8.00 ppb C
West Bridgewater 1.00 ppb A
Halifax 6.00 ppb A
Mattapoisett 4.00 ppb A
Marion 4.00 ppb B
Lakeville 1.80 ppb A
Rochester 4.00 ppb B
Carver 2.00 ppb B
Green Harbor 4.40 ppb C
Plympton 1.00 ppb B
Showing 28 cities
No active violations Active violations

About Plymouth County Drinking Water

Plymouth County is served by 23 water systems covering 28 communities. No community here has an open violation on record.

Of the communities reporting lead results, 27 recorded a detection, with a median of 3.00 ppb — 20% of the federal action level. 1 reported none detected, which means below the laboratory limit rather than an absence of lead.

12 of 28 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 2 of them.

Frequently Asked Questions

Is Plymouth County tap water safe to drink?▼
No community in Plymouth County has an open violation on record. 12 of 28 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Plymouth County?▼
Among communities with a detection the median is 3.00 ppb, 20% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Plymouth County?▼
23 community water systems serve 28 communities here.
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