Cogswell Springs Water Works
EPA ID: NH1121010 · 3,000 people served · 1 ZIP code
ZipCheckup's reading of EPA records for Cogswell Springs Water Works (NH1121010): a lead 90th-percentile reading above the EPA action level. Cogswell Springs Water Works's compliance file in EPA SDWIS lists no violations, whether health-based or monitoring and reporting, for a utility that supplies water to approximately 3,000 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Cogswell Springs Water Works Source: EPA SDWIS service area boundaries.
Service area boundary
Demographics of ZIP Codes Served
The ZIP codes associated with Cogswell Springs Water Works have a median household income of $87,344 and about 6,161 residents live in those ZIP codes (Census; not the number of people this system supplies). 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 classified in EPA records as a groundwater source. 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.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in New Hampshire
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.
Violation History
Lead & Copper
Latest reported 90th-percentile lead result for this PWSID: 0.019 mg/L (1993-12-31).
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
1 of 1 ZIP records with known zones is in EPA Radon Zone 2.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
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 available EPA compliance records for Cogswell Springs Water Works (NH1121010) on EPA.gov.
Frequently Asked Questions
Is Cogswell Springs Water Works water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Cogswell Springs Water Works in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
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.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Cogswell Springs Water Works Water Quality Report, NH. https://zipcheckup.com/water-system/nh1121010/
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author = {{ZipCheckup}},
title = {{Cogswell Springs Water Works Water Quality Report, NH}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/nh1121010/}
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