B65/100
Nashua Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 116,336 residents · New Hampshire
What's In Nashua's Tap Water?
76
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2008.
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
Water Utility Details
LOCKE LAKE
Population Served
2,278
Water Source
Surface Water
System ID
NH0142010
POWDER HILL
Population Served
1,155
Water Source
Purchased Surface Water
System ID
NH0192050
LITTLE POND ESTATES
Population Served
3,000
Water Source
Purchased Surface Water
System ID
NH0192080
BELMONT WATER DEPT
Population Served
1,612
Water Source
Groundwater
System ID
NH0201010
PENACOOK BOSCAWEN WATER PCT
Population Served
3,800
Water Source
Groundwater
System ID
NH0251010
DREW WOODS
Population Served
1,408
Water Source
Purchased Surface Water
System ID
NH0612150
LITCHFIELD
Population Served
7,000
Water Source
Purchased Surface Water
System ID
NH1371010
LONDONDERRY
Population Served
5,380
Water Source
Purchased Surface Water
System ID
NH1391010
PENNICHUCK WATER WORKS
Population Served
89,073
Water Source
Surface Water
System ID
NH1621010
PITTSFIELD AQUEDUCT
Population Served
1,630
Water Source
Surface Water
System ID
NH1911010
Frequently Asked Questions About Nashua Water
Is Nashua tap water safe to drink?
Nashua, New Hampshire tap water receives a grade of B (65/100), which is considered good. Out of 77 contaminants tested, 3 exceed EPA maximum contaminant levels (MCLs) and 3 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Nashua's water?
Of the 77 contaminants tested in Nashua's water supply, the most notable include Lead (90th percentile), PFOA, Copper (90th percentile). 3 contaminant(s) exceed EPA legal limits (MCLs). 3 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Nashua have any water quality violations?
Yes, Nashua has 183 EPA violation(s) on record, with the most recent in 2019. Violation types include MR, MCL, Other. 30 of these are health-based violations, which are the most serious category.
Do I need a water filter in Nashua?
Based on EPA data, using a water filter in Nashua is recommended. 3 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Nashua's tap water come from?
Nashua's drinking water is sourced from surface water and supplied by LOCKE LAKE and 9 other water system(s). The system serves approximately 116,336 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Nashua's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Nashua's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Nashua's water compare to other cities in New Hampshire?
Nashua's water quality score of 65/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our New Hampshire state page to see how all cities in the state compare.
What should I do if I'm concerned about Nashua's water quality?
If you have concerns about Nashua's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (LOCKE LAKE) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.