States › New Hampshire › Belknap County

Belknap County, NH Water Quality

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

📅 2026 Report 🔄 Data updated 2026 Q2 📍 9 water systems · 11 cities
⚠️
Caution Advised — Some Systems Need Attention

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

C

Belknap County Earns a C

Belknap County: 11 communities across 9 water systems. 100.0% have no open violations.

  • Median lead where detected: 28.50 ppb
  • 10 communities with a lead detection, 0 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 3 with significant inspection deficiencies
  • 100.0% of communities have no open violations
28.5 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
  • Laconia
    4.00 ppb
    No federal limits exceeded on record
    A
  • Barnstead
    Not reported
    2 health-based violations since 2015
    B
  • Sanbornton
    3.00 ppb
    Copper above the 1,300 ppb action level
    B
  • Meredith
    6.00 ppb
    3 health-based violations since 2015
    B
  • Center Harbor
    6.00 ppb
    3 health-based violations since 2015
    B
⚠ Needs Attention
  • New Hampton
    23.00 ppb
    Lead above the 15 ppb action level
    F
  • Belmont
    85.00 ppb
    Lead above the 15 ppb action level
    D
  • Alton
    210.00 ppb
    Lead above the 15 ppb action level
    D
  • Gilford
    34.00 ppb
    Lead above the 15 ppb action level
    C
  • Tilton Northfield
    36.00 ppb
    Lead above the 15 ppb action level
    C
County Lead Level — Median 28.5 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 28.5 ppb — 190% of the federal action level
Systems by Lead Level
Under 5 ppb
2
5 – 10 ppb
2
10 – 15 ppb
6
No Data
1

All Cities in Belknap County

Laconia 4.00 ppb A
Meredith 6.00 ppb B
Tilton Northfield 36.00 ppb C
Barnstead Not reported B
Belmont 85.00 ppb D
Tilton 36.00 ppb C
Alton 210.00 ppb D
Gilford 34.00 ppb C
New Hampton 23.00 ppb F
Sanbornton 3.00 ppb B
Center Harbor 6.00 ppb B
Showing 11 cities
No active violations Active violations

About Belknap County Drinking Water

Belknap County is served by 9 water systems covering 11 communities. No community here has an open violation on record.

Of the communities reporting lead results, 10 recorded a detection, with a median of 28.50 ppb — 190% of the federal action level. 0 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 3 of them.

Frequently Asked Questions

Is Belknap County tap water safe to drink?▼
No community in Belknap County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Belknap County?▼
Among communities with a detection the median is 28.50 ppb, 190% of the 15 ppb action level. 0 reported none detected and 1 reported no result.
How many water systems serve Belknap County?▼
9 community water systems serve 11 communities here.
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