Hemlock Haven
EPA ID: NH1053020 · 207 people served · 6 ZIP codes
Five clean years on EPA record — Hemlock Haven, 207 residents served.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Stable · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 6 (2023) to 4 (2025). Violation counts have remained relatively steady.
Service Area Map
Coverage area for Hemlock Haven Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Hemlock Haven serves a community with a median household income of $100,477 and an estimated 39,411 residents across its service area. Approximately 71% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Hemlock Haven's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
About 1% of homes in Rockingham County, New Hampshire rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Superfund Proximity Note: This service area ranks in the 80th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 18 detections recorded. 6 exceed federal EPA limits (4 ppt for PFOA/PFOS).
Comparable Water Systems
Similar-sized systems in New Hampshire
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Hemlock Haven (EPA ID: NH1053020) is a community water system in New Hampshire that serves approximately 207 people from groundwater sources.
This system provides water to 6 ZIP codes across 2 communities.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 1 ZIP code confirmed via EPA Community Water System Service Area Boundaries v3 plus 5 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
- 03801 — Portsmouth
- 03802 — Portsmouth
- 03803 — Portsmouth
- 03804 — Portsmouth
- 03842 — Hampton
- 03843 — Hampton
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Hemlock Haven (NH1053020) on EPA.gov.
Frequently Asked Questions
Is Hemlock Haven water safe to drink?
Based on EPA records, Hemlock Haven has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Hemlock Haven serve?
Hemlock Haven serves approximately 207 people across 6 ZIP codes in New Hampshire.
Where does Hemlock Haven get its water?
The primary water source is groundwater.