A90/100
LONDONDERRY — Water Quality Report 2026
Serving 5,380 people · New Hampshire
Water Source
Purchased Surface Water
County
—
System ID
NH1391010
Violations
2
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOA | 0.006 µg/L | 0.004 µg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2013.
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 LONDONDERRY
Is LONDONDERRY water safe to drink?
LONDONDERRY water receives a grade of A (90/100), which is considered excellent. Out of 34 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has LONDONDERRY detected?
34 contaminants were tested in LONDONDERRY's water. Notable contaminants include PFOA. 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does LONDONDERRY have any EPA violations?
Yes, LONDONDERRY has 2 EPA violation(s) on record, with the most recent in 2013. Violation types include MR.
How many people does LONDONDERRY serve?
LONDONDERRY serves approximately 5,380 people, New Hampshire. The system provides water to 1 community: Londonderry.
What type of water does LONDONDERRY provide?
LONDONDERRY sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is NH1391010.
How does LONDONDERRY compare to other utilities in New Hampshire?
LONDONDERRY scores 90/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our New Hampshire state page for a full comparison of water systems.