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Strafford County, NH Water Quality

Water quality data for 13 public water systems serving Strafford County, New Hampshire — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 13 water systems · 13 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

Strafford County Earns a B

Strafford County: 13 communities across 13 water systems. 100.0% have no open violations.

  • Median lead where detected: 11.00 ppb
  • 4 communities with a lead detection, 3 reporting none detected
  • 1 communities with PFAS above the federal limit
  • 1 with significant inspection deficiencies
  • 100.0% of communities have no open violations
11 ppb
Median Lead Level
County-wide, 90th percentile
13
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
  • Dover
    1.00 ppb
    No federal limits exceeded on record
    A
  • Durham
    Not detected
    No federal limits exceeded on record
    A
  • Somersworth
    Not detected
    No federal limits exceeded on record
    A
  • Milton
    Not reported
    No federal limits exceeded on record
    B
  • Barrington
    Not reported
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • Rollinsford
    43.00 ppb
    Lead above the 15 ppb action level
    D
  • Madbury
    Not detected
    PFAS above the limit at 1 of 8 sampling points
    C
  • Strafford
    Not reported
    Copper above the 1,300 ppb action level
    C
  • Farmington
    20.00 ppb
    Lead above the 15 ppb action level
    C
  • Rochester
    2.00 ppb
    3 health-based violations since 2015
    B
County Lead Level — Median 11 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 11 ppb — 73.3% of the federal action level
Systems by Lead Level
Under 5 ppb
2
10 – 15 ppb
2
No Data
9

All Cities in Strafford County

Dover 1.00 ppb A
Rochester 2.00 ppb B
Durham Not detected A
Somersworth Not detected A
Farmington 20.00 ppb C
Rollinsford 43.00 ppb D
Milton Not reported B
Barrington Not reported B
Lee Not reported B
Madbury Not detected C
New Durham Not reported B
Middleton Not reported B
Strafford Not reported C
Showing 13 cities
No active violations Active violations

About Strafford County Drinking Water

Strafford County is served by 13 water systems covering 13 communities. No community here has an open violation on record.

Of the communities reporting lead results, 4 recorded a detection, with a median of 11.00 ppb — 73% of the federal action level. 3 reported none detected, which means below the laboratory limit rather than an absence of lead.

1 of 13 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 1 of them.

Frequently Asked Questions

Is Strafford County tap water safe to drink?▼
No community in Strafford County has an open violation on record. 1 of 13 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Strafford County?▼
Among communities with a detection the median is 11.00 ppb, 73% of the 15 ppb action level. 3 reported none detected and 6 reported no result.
How many water systems serve Strafford County?▼
13 community water systems serve 13 communities here.
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