States › New Hampshire › Rockingham County

Rockingham County, NH Water Quality

Water quality data for 29 public water systems serving Rockingham 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 · 38 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

Rockingham County Earns a B

Rockingham County: 38 communities across 29 water systems. 100.0% have no open violations.

  • Median lead where detected: 3.00 ppb
  • 16 communities with a lead detection, 10 reporting none detected
  • 9 communities with PFAS above the federal limit
  • 5 with significant inspection deficiencies
  • 100.0% of communities have no open violations
3 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
  • Derry
    Not detected
    No federal limits exceeded on record
    A
  • Newmarket
    2.00 ppb
    No federal limits exceeded on record
    A
  • Epping
    Not reported
    No federal limits exceeded on record
    B
  • Windham
    Not reported
    No federal limits exceeded on record
    B
  • Danville
    Not reported
    No federal limits exceeded on record
    B
⚠ Needs Attention
  • New Castle
    17.00 ppb
    Lead above the 15 ppb action level
    D
  • Hampstead
    2.00 ppb
    PFAS above the limit at 5 of 12 sampling points
    D
  • Atkinson
    2.00 ppb
    PFAS above the limit at 5 of 12 sampling points
    D
  • Kingston
    2.00 ppb
    PFAS above the limit at 5 of 12 sampling points
    D
  • Brentwood
    22.00 ppb
    Lead above the 15 ppb action level
    C
County Lead Level — Median 3 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 3 ppb — 20% of the federal action level
Systems by Lead Level
Under 5 ppb
11
10 – 15 ppb
5
No Data
22

All Cities in Rockingham County

Salem 2.00 ppb B
Portsmouth Not detected C
Derry Not detected A
Hampton Not detected A
Exeter Not detected B
Londonderry Not detected B
Seabrook 3.00 ppb A
Newmarket 2.00 ppb A
Hampstead 2.00 ppb D
Atkinson 2.00 ppb D
Raymond 1.00 ppb A
Rye Not detected B
North Hampton Not detected A
Plaistow Not reported B
Epping Not reported B
Windham Not reported B
Greenland Not detected C
Newfields 31.00 ppb C
New Castle 17.00 ppb D
Brentwood 22.00 ppb C
Seabrook Beach 3.00 ppb A
Newington Not detected C
Danville Not reported B
Auburn Not detected B
Stratham Not reported B
Sandown Not reported B
Chester Not reported B
Kingston 2.00 ppb D
Northwood Not reported B
Newton Not reported B
Fremont 20.00 ppb C
East Kingston Not reported B
Candia 20.00 ppb C
Hampton Falls 3.00 ppb A
Deerfield Not reported B
Nottingham Not reported B
Kensington 3.00 ppb A
South Hampton 3.00 ppb A
Showing 38 cities
No active violations Active violations

About Rockingham County Drinking Water

Rockingham County is served by 29 water systems covering 38 communities. No community here has an open violation on record.

Of the communities reporting lead results, 16 recorded a detection, with a median of 3.00 ppb — 20% of the federal action level. 10 reported none detected, which means below the laboratory limit rather than an absence of lead.

9 of 38 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 5 of them.

Frequently Asked Questions

Is Rockingham County tap water safe to drink?▼
No community in Rockingham County has an open violation on record. 9 of 38 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Rockingham County?▼
Among communities with a detection the median is 3.00 ppb, 20% of the 15 ppb action level. 10 reported none detected and 12 reported no result.
How many water systems serve Rockingham County?▼
29 community water systems serve 38 communities here.
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