B76/100
Winchester Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 2,800 residents · New Hampshire
What's In Winchester's Tap Water?
1
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.51 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2016.
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
WINCHESTER WATER DEPT
Population Served
2,800
Water Source
Groundwater
System ID
NH2531010
Frequently Asked Questions About Winchester Water
Is Winchester tap water safe to drink?
Winchester, New Hampshire tap water receives a grade of B (76/100), which is considered good. Out of 1 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 1 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 Winchester's water?
Of the 1 contaminants tested in Winchester's water supply, the most notable include Copper (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Winchester have any water quality violations?
Yes, Winchester has 4 EPA violation(s) on record, with the most recent in 2016. Violation types include MR, MCL, TT. 3 of these are health-based violations, which are the most serious category.
Do I need a water filter in Winchester?
Based on EPA data, using a water filter in Winchester is recommended. 1 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 Winchester's tap water come from?
Winchester's drinking water is sourced from groundwater and supplied by WINCHESTER WATER DEPT. The system serves approximately 2,800 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Winchester'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. Winchester'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 Winchester's water compare to other cities in New Hampshire?
Winchester's water quality score of 76/100 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 Winchester's water quality?
If you have concerns about Winchester'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 (WINCHESTER WATER DEPT) 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.