B61/100
COGSWELL SPRINGS WATER WORKS — Water Quality Report 2026
Serving 3,000 people · New Hampshire
Water Source
Groundwater
County
—
System ID
NH1121010
Violations
11
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.019 mg/L | 0.015 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2019.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About COGSWELL SPRINGS WATER WORKS
Is COGSWELL SPRINGS WATER WORKS water safe to drink?
COGSWELL SPRINGS WATER WORKS water receives a grade of B (61/100), which is considered good. Out of 1 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has COGSWELL SPRINGS WATER WORKS detected?
1 contaminants were tested in COGSWELL SPRINGS WATER WORKS's water. Notable contaminants include Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does COGSWELL SPRINGS WATER WORKS have any EPA violations?
Yes, COGSWELL SPRINGS WATER WORKS has 11 EPA violation(s) on record, with the most recent in 2019. Violation types include MR, MCL, Other. 5 are health-based violations.
How many people does COGSWELL SPRINGS WATER WORKS serve?
COGSWELL SPRINGS WATER WORKS serves approximately 3,000 people, New Hampshire. The system provides water to 1 community: Henniker.
What type of water does COGSWELL SPRINGS WATER WORKS provide?
COGSWELL SPRINGS WATER WORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is NH1121010.
How does COGSWELL SPRINGS WATER WORKS compare to other utilities in New Hampshire?
COGSWELL SPRINGS WATER WORKS scores 61/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our New Hampshire state page for a full comparison of water systems.