New Hampshire County Water Quality Reports
Water quality reports for all counties in New Hampshire. Browse by county to see safety scores, violations, and ZIP code data.
Browse water quality data by county in New Hampshire. Each county page lists all ZIP codes with safety scores and EPA violation data.
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Belknap County, NH: Lead Above EPA Limits — 67/100 (2026)
2026 report: Belknap County, NH scores 67/100 (Grade C). 20 ZIP codes analyzed. 80 EPA violations found. Lead above EPA limits. Free report with contami...
Carroll County, NH: Lead Above EPA Limits — 45/100 (2026)
2026 report: Carroll County, NH scores 45/100 (Grade D). 32 ZIP codes analyzed. 115 EPA violations found. Lead above EPA limits. Free report with contam...
Cheshire County, NH: Lead Above EPA Limits — 64/100 (2026)
2026 report: Cheshire County, NH scores 64/100 (Grade C). 28 ZIP codes analyzed. 18 EPA violations found. Lead above EPA limits. Free report with contam...
Coos County, NH: 1 Health Violation — 67/100 (2026)
2026 report: Coos County, NH scores 67/100 (Grade C). 16 ZIP codes analyzed. 6 EPA violations found. Free report with contaminant data and filter picks.
Grafton County, NH: Lead Above EPA Limits — 65/100 (2026)
2026 report: Grafton County, NH scores 65/100 (Grade C). 39 ZIP codes analyzed. 92 EPA violations found. Lead above EPA limits. Free report with contami...
Hillsborough County, NH: Lead Above EPA Limits — 71/100
2026 report: Hillsborough County, NH scores 71/100 (Grade B). 41 ZIP codes analyzed. 138 EPA violations found. Lead above EPA limits. Free report with c...
Merrimack County, NH: Lead Above EPA Limits — 63/100 (2026)
2026 report: Merrimack County, NH scores 63/100 (Grade C). 32 ZIP codes analyzed. 146 EPA violations found. Lead above EPA limits. Free report with cont...
Rockingham County, NH: Lead Above EPA Limits — 69/100 (2026)
2026 report: Rockingham County, NH scores 69/100 (Grade C). 41 ZIP codes analyzed. 97 EPA violations found. Lead above EPA limits. Free report with cont...
Strafford County, NH: Lead Above EPA Limits — 70/100 (2026)
2026 report: Strafford County, NH scores 70/100 (Grade B). 20 ZIP codes analyzed. 108 EPA violations found. Lead above EPA limits. Free report with cont...
Sullivan County, NH: Lead Above EPA Limits — 63/100 (2026)
2026 report: Sullivan County, NH scores 63/100 (Grade C). 13 ZIP codes analyzed. 9 EPA violations found. Lead above EPA limits. Free report with contami...
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