States › New Hampshire › Cheshire County

Cheshire County, NH Water Quality

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

📅 2026 Report 🔄 Data updated 2026 Q2 📍 11 water systems · 14 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

Cheshire County Earns a B

Cheshire County: 14 communities across 11 water systems. 100.0% have no open violations.

  • Median lead where detected: 33.00 ppb
  • 5 communities with a lead detection, 5 reporting none detected
  • 2 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
33 ppb
Median Lead Level
County-wide, 90th percentile
11
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
  • Walpole
    Not reported
    No federal limits exceeded on record
    B
  • Keene
    Not detected
    Copper above the 1,300 ppb action level
    A
  • Hinsdale
    Not reported
    Copper above the 1,300 ppb action level
    B
  • Winchester
    Not reported
    Copper above the 1,300 ppb action level
    B
  • Marlborough
    Not reported
    Copper above the 1,300 ppb action level
    B
⚠ Needs Attention
  • Fitzwilliam
    53.00 ppb
    Lead above the 15 ppb action level
    D
  • Westmoreland
    32.00 ppb
    Lead above the 15 ppb action level
    D
  • Surry
    17.00 ppb
    Lead above the 15 ppb action level
    D
  • Troy
    37.00 ppb
    Lead above the 15 ppb action level
    C
  • Jaffrey
    Not detected
    PFAS above the limit at 1 of 4 sampling points
    C
County Lead Level — Median 33 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 33 ppb — 220% of the federal action level
Systems by Lead Level
10 – 15 ppb
5
No Data
9

All Cities in Cheshire County

Keene Not detected A
Jaffrey Not detected C
Hinsdale Not reported B
Winchester Not reported B
Troy 37.00 ppb C
Walpole Not reported B
Marlborough Not reported B
Rindge Not detected C
Swanzey Not detected A
Fitzwilliam 53.00 ppb D
Westmoreland 32.00 ppb D
Alstead 33.00 ppb C
Surry 17.00 ppb D
Roxbury Not detected A
Showing 14 cities
No active violations Active violations

About Cheshire County Drinking Water

Cheshire County is served by 11 water systems covering 14 communities. No community here has an open violation on record.

Of the communities reporting lead results, 5 recorded a detection, with a median of 33.00 ppb — 220% of the federal action level. 5 reported none detected, which means below the laboratory limit rather than an absence of lead.

2 of 14 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Cheshire County tap water safe to drink?▼
No community in Cheshire County has an open violation on record. 2 of 14 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Cheshire County?▼
Among communities with a detection the median is 33.00 ppb, 220% of the 15 ppb action level. 5 reported none detected and 4 reported no result.
How many water systems serve Cheshire County?▼
11 community water systems serve 14 communities here.
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