Neighborhood Report
Grade B
Portsmouth, NH Neighborhood Water Quality — Grade B
4 ZIP codes · 12 EPA violations
Data source: EPA SDWIS Last verified: 2026-06-04
Water quality varies significantly across Portsmouth, NH. We analyzed 4 ZIP codes to help you compare neighborhoods by water safety, lead risk, and EPA compliance.
City Overview: Grade B (81/100)
| Grade | Neighborhoods | % |
|---|---|---|
| A | 0 | 0% |
| B | 4 | 100% |
| C | 0 | 0% |
| D | 0 | 0% |
| F | 0 | 0% |
Neighborhood Rankings
Every ZIP code in Portsmouth ranked by Home Safety Score:
| Rank | ZIP Code | Score | Grade | Violations | Lead Risk |
|---|---|---|---|---|---|
| 1 | 03802 | 82 | B | 3 | 0.0010 mg/L |
| 2 | 03803 | 82 | B | 3 | 0.0010 mg/L |
| 3 | 03804 | 82 | B | 3 | 0.0010 mg/L |
| 4 | 03801 | 77 | B | 3 | 0.0010 mg/L |
How Neighborhoods Compare
Each ZIP code compared to county and state averages:
- 4 neighborhoods score better than county average
- 0 neighborhoods score worse than county average
EPA Violations
- 12 total violations across Portsmouth
- 4 health-based violations
- 4 of 4 ZIP codes have violations
- 0 ZIP codes exceed EPA lead action level
Top Contaminants
| Contaminant | Violations | ZIPs |
|---|---|---|
| Stage 1 DBP Rule | 8 | 4 |
| Consumer Confidence Report Rule | 4 | 4 |
Frequently Asked Questions
What is the safest neighborhood in Portsmouth?
ZIP code 03802 has the highest safety score in Portsmouth at 82/100 (grade B). Check the full report for details.
Is Portsmouth water safe to drink?
Portsmouth has an average water safety score of 81/100 (B). Water quality varies by neighborhood — no ZIP codes currently exceed EPA lead limits. Always check your specific ZIP code.
Related Pages
Data Sources
- EPA SDWIS
- U.S. Census Bureau
Updated daily.