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Tolland County, CT Water Quality

Water quality data for 9 public water systems serving Tolland 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 · 12 cities
⚠️
Caution Advised — Some Systems Need Attention

Some systems have elevated lead levels or active violations. Check your specific city below.

C

Tolland County Earns a C

Tolland County: 12 communities across 9 water systems. 75.0% have no open violations.

  • Median lead where detected: 1.90 ppb
  • 11 communities with a lead detection, 1 reporting none detected
  • 5 communities with PFAS above the federal limit
  • 4 with significant inspection deficiencies
  • 75.0% of communities have no open violations
1.9 ppb
Median Lead Level
County-wide, 90th percentile
9
Water Systems
Active CWS & NTNCWS
75%
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
  • Coventry
    Not detected
    No federal limits exceeded on record
    A
  • Hebron
    1.50 ppb
    No federal limits exceeded on record
    B
  • Willington
    2.40 ppb
    No federal limits exceeded on record
    B
  • Mansfield
    0.70 ppb
    PFAS above the limit at 1 of 2 sampling points
    B
  • Vernon
    1.90 ppb
    PFAS above the limit at 4 of 7 sampling points
    C
⚠ Needs Attention
  • Stafford
    10.20 ppb
    1 violation currently open
    D
  • Columbia
    39.60 ppb
    Lead above the 15 ppb action level
    C
  • Bolton
    1.20 ppb
    1 violation currently open
    C
  • Andover
    1.00 ppb
    1 violation currently open
    C
  • Vernon
    1.90 ppb
    PFAS above the limit at 4 of 7 sampling points
    C
County Lead Level — Median 1.9 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.9 ppb — 12.7% of the federal action level
Systems by Lead Level
Under 5 ppb
9
10 – 15 ppb
2
No Data
1

All Cities in Tolland County

Vernon 1.90 ppb C
Ellington 1.90 ppb C
Mansfield 0.70 ppb B
Somers 1.90 ppb C
Tolland 1.90 ppb C
Coventry Not detected A
Columbia 39.60 ppb C
Hebron 1.50 ppb B
Willington 2.40 ppb B
Bolton 1.20 ppb C
Stafford 10.20 ppb D
Andover 1.00 ppb C
Showing 12 cities
No active violations Active violations

About Tolland County Drinking Water

Tolland County is served by 9 water systems covering 12 communities. 75% have no open violations.

Of the communities reporting lead results, 11 recorded a detection, with a median of 1.90 ppb — 13% of the federal action level. 1 reported none detected, which means below the laboratory limit rather than an absence of lead.

5 of 12 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 4 of them.

Frequently Asked Questions

Is Tolland County tap water safe to drink?▼
75% of communities have no open violation. 5 of 12 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Tolland County?▼
Among communities with a detection the median is 1.90 ppb, 13% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Tolland County?▼
9 community water systems serve 12 communities here.
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