States › Connecticut › Fairfield County

Fairfield County, CT Water Quality

Water quality data for 9 public water systems serving Fairfield County, Connecticut — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 9 water systems · 25 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Fairfield County Earns a A

Fairfield County: 25 communities across 9 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.00 ppb
  • 5 communities with a lead detection, 20 reporting none detected
  • 4 communities with PFAS above the federal limit
  • 5 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2 ppb
Median Lead Level
County-wide, 90th percentile
9
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
  • Bridgeport
    Not detected
    No federal limits exceeded on record
    A
  • Stamford
    Not detected
    No federal limits exceeded on record
    A
  • Fairfield
    Not detected
    No federal limits exceeded on record
    A
  • Greenwich
    Not detected
    No federal limits exceeded on record
    A
  • Stratford
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Ridgefield
    3.10 ppb
    PFAS above the limit at 3 of 4 sampling points
    D
  • Bethel
    1.40 ppb
    PFAS above the limit at 1 of 1 sampling points
    D
  • Danbury
    Not detected
    PFAS above the limit at 1 of 2 sampling points
    C
  • Brookfield
    2.00 ppb
    PFAS above the limit at 2 of 5 sampling points
    C
  • Norwalk
    Not detected
    1 significant inspection deficiency
    C
County Lead Level — Median 2 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2 ppb — 13.3% of the federal action level
Systems by Lead Level
Under 5 ppb
5
No Data
20

All Cities in Fairfield County

Bridgeport Not detected A
Stamford Not detected A
Danbury Not detected C
Fairfield Not detected A
Greenwich Not detected A
Stratford Not detected A
Norwalk Not detected C
Shelton Not detected A
Trumbull Not detected A
Westport Not detected A
Darien Not detected A
Monroe Not detected A
Ridgefield 3.10 ppb D
New Canaan Not detected A
Bethel 1.40 ppb D
Newtown Not detected A
Wilton Not detected A
Brookfield 2.00 ppb C
Easton Not detected A
Georgetown Not detected A
New Fairfield 2.80 ppb B
Weston Not detected B
Plattsville Not detected A
Redding Not detected A
Sherman 1.00 ppb B
Showing 25 cities
No active violations Active violations

About Fairfield County Drinking Water

Fairfield County is served by 9 water systems covering 25 communities. No community here has an open violation on record.

Of the communities reporting lead results, 5 recorded a detection, with a median of 2.00 ppb — 13% of the federal action level. 20 reported none detected, which means below the laboratory limit rather than an absence of lead.

4 of 25 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 Fairfield County tap water safe to drink?▼
No community in Fairfield County has an open violation on record. 4 of 25 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Fairfield County?▼
Among communities with a detection the median is 2.00 ppb, 13% of the 15 ppb action level. 20 reported none detected and 0 reported no result.
How many water systems serve Fairfield County?▼
9 community water systems serve 25 communities here.
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