States › Connecticut › Middlesex County

Middlesex County, CT Water Quality

Water quality data for 11 public water systems serving Middlesex County, Connecticut — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 11 water systems · 15 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

Middlesex County Earns a B

Middlesex County: 15 communities across 11 water systems. 93.3% have no open violations.

  • Median lead where detected: 1.60 ppb
  • 3 communities with a lead detection, 12 reporting none detected
  • 3 communities with PFAS above the federal limit
  • 5 with significant inspection deficiencies
  • 93.3% of communities have no open violations
1.6 ppb
Median Lead Level
County-wide, 90th percentile
11
Water Systems
Active CWS & NTNCWS
93%
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
  • Cromwell
    Not detected
    No federal limits exceeded on record
    A
  • Portland
    Not detected
    No federal limits exceeded on record
    A
  • Essex
    Not detected
    No federal limits exceeded on record
    A
  • Deep River
    Not detected
    No federal limits exceeded on record
    A
  • Chester
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Clinton
    Not detected
    PFAS above the limit at 5 of 8 sampling points
    D
  • Old Saybrook
    Not detected
    PFAS above the limit at 5 of 8 sampling points
    D
  • Westbrook
    Not detected
    PFAS above the limit at 5 of 8 sampling points
    D
  • Middlefield
    1.40 ppb
    1 violation currently open
    C
  • Middletown
    Not detected
    1 significant inspection deficiency
    A
County Lead Level — Median 1.6 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.6 ppb — 10.7% of the federal action level
Systems by Lead Level
Under 5 ppb
3
No Data
12

All Cities in Middlesex County

Middletown Not detected A
Cromwell Not detected A
Clinton Not detected D
Old Saybrook Not detected D
Portland Not detected A
Westbrook Not detected D
Essex Not detected A
Deep River Not detected A
Chester Not detected A
East Hampton Not detected B
Killingworth 2.70 ppb B
Middlefield 1.40 ppb C
Durham Not detected B
East Haddam Not detected B
Haddam 1.60 ppb B
Showing 15 cities
No active violations Active violations

About Middlesex County Drinking Water

Middlesex County is served by 11 water systems covering 15 communities. 93% have no open violations.

Of the communities reporting lead results, 3 recorded a detection, with a median of 1.60 ppb — 11% of the federal action level. 12 reported none detected, which means below the laboratory limit rather than an absence of lead.

3 of 15 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 5 of them.

Frequently Asked Questions

Is Middlesex County tap water safe to drink?▼
93% of communities have no open violation. 3 of 15 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Middlesex County?▼
Among communities with a detection the median is 1.60 ppb, 11% of the 15 ppb action level. 12 reported none detected and 0 reported no result.
How many water systems serve Middlesex County?▼
11 community water systems serve 15 communities here.
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