States › New Hampshire › Grafton County

Grafton County, NH Water Quality

Water quality data for 29 public water systems serving Grafton County, New Hampshire — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 29 water systems · 33 cities
⚠️
Caution Advised — Some Systems Need Attention

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

C

Grafton County Earns a C

Grafton County: 33 communities across 29 water systems. 100.0% have no open violations.

  • Median lead where detected: 21.00 ppb
  • 24 communities with a lead detection, 2 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 5 with significant inspection deficiencies
  • 100.0% of communities have no open violations
21 ppb
Median Lead Level
County-wide, 90th percentile
29
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
  • Hanover
    Not detected
    No federal limits exceeded on record
    A
  • Woodstock
    Not reported
    No federal limits exceeded on record
    B
  • Thornton
    Not reported
    No federal limits exceeded on record
    B
  • Lyme
    Not reported
    No federal limits exceeded on record
    B
  • Piermont
    Not reported
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Lisbon
    21.00 ppb
    Lead above the 15 ppb action level
    D
  • Landaff
    21.00 ppb
    Lead above the 15 ppb action level
    D
  • Bethlehem
    21.00 ppb
    Lead above the 15 ppb action level
    D
  • Campton
    37.00 ppb
    Lead above the 15 ppb action level
    D
  • Holderness
    17.00 ppb
    Lead above the 15 ppb action level
    D
County Lead Level — Median 21 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 21 ppb — 140% of the federal action level
Systems by Lead Level
Under 5 ppb
1
5 – 10 ppb
4
10 – 15 ppb
19
No Data
9

All Cities in Grafton County

Lebanon Not detected B
Hanover Not detected A
Plymouth 2.00 ppb A
Littleton 8.00 ppb B
Bristol 7.00 ppb B
Bethlehem 21.00 ppb D
Haverhill 36.00 ppb C
Lincoln 7.00 ppb C
Enfield Not reported B
Ashland 31.00 ppb C
Woodstock Not reported B
Lisbon 21.00 ppb D
Canaan 16.00 ppb D
Franconia 18.00 ppb C
Campton 37.00 ppb D
Waterville Valley 69.00 ppb C
Monroe 32.00 ppb C
Mountain Lakes 32.00 ppb C
Thornton Not reported B
Lyme Not reported B
Bath 36.00 ppb C
Alexandria 7.00 ppb B
Warren 22.00 ppb D
Piermont Not reported B
Rumney 21.00 ppb C
Benton 24.00 ppb C
Orford 383.00 ppb C
Bridgewater 24.00 ppb C
Hebron Not reported B
Landaff 21.00 ppb D
Holderness 17.00 ppb D
Groton Not reported B
Sugar Hill 18.00 ppb C
Showing 33 cities
No active violations Active violations

About Grafton County Drinking Water

Grafton County is served by 29 water systems covering 33 communities. No community here has an open violation on record.

Of the communities reporting lead results, 24 recorded a detection, with a median of 21.00 ppb — 140% of the federal action level. 2 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded significant deficiencies at 5 of them.

Frequently Asked Questions

Is Grafton County tap water safe to drink?▼
No community in Grafton County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Grafton County?▼
Among communities with a detection the median is 21.00 ppb, 140% of the 15 ppb action level. 2 reported none detected and 7 reported no result.
How many water systems serve Grafton County?▼
29 community water systems serve 33 communities here.
← Back to New Hampshire water quality overview