Cogswell Springs Water Works
EPA ID: NH1121010 · 3,000 people served · 1 ZIP code
1 open EPA finding remain on record at Cogswell Springs Water Works — the utility supplies approximately 3,000 people.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Cogswell Springs Water Works Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The Cogswell Springs Water Works serves a community with a median household income of $87,344 and an estimated 6,161 residents across its service area. Approximately 77% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Cogswell Springs Water Works'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 Merrimack County, New Hampshire rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How Cogswell Springs Water Works compares to EPA limits
Nickel was detected in this water system. reverse osmosis filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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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
Cogswell Springs Water Works (EPA ID: NH1121010) is a community water system in New Hampshire that serves approximately 3,000 people from groundwater sources.
This system serves ZIP code 03242 in Henniker.
Average Home Safety Score: D (54/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Nickel | Inorganic | 1 | Yes |
Health Risk Details
Fluoride (EPA limit: 4 mg/L (secondary standard: 2.0 mg/L))
Tooth & bone damage at high levels At-risk groups: children under 8 during tooth development, elderly with compromised bone density, people with kidney disease.
Removal methods: reverse osmosis, activated alumina, distillation. Find the right filter →
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 03242 | 0.023 mg/L | Yes | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
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: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by NH or modeled from parcel and building-footprint data.
- 03242 — Henniker
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Cogswell Springs Water Works (NH1121010) on EPA.gov.
Frequently Asked Questions
Is Cogswell Springs Water Works water safe to drink?
Cogswell Springs Water Works has recorded 1 health-based violation in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Cogswell Springs Water Works serve?
Cogswell Springs Water Works serves approximately 3,000 people across 1 ZIP code in New Hampshire.
Where does Cogswell Springs Water Works get its water?
The primary water source is groundwater.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Cogswell Springs Water Works (EPA ID: NH1121010) — request the latest Consumer Confidence Report or ask about specific contaminants.