C43/100
Groton Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 7,309 residents · Massachusetts
What's In Groton's Tap Water?
32
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.50 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.005 mg/L | 0.015 mg/L | Above Goal |
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
Water Utility Details
GROTON WATER DEPARTMENT
Population Served
5,456
Water Source
Groundwater
System ID
MA2115000
WEST GROTON WATER SUPPLY DISTRICT
Population Served
1,853
Water Source
Groundwater
System ID
MA2115001
Frequently Asked Questions About Groton Water
Is Groton tap water safe to drink?
Groton, Massachusetts tap water receives a grade of C (43/100), which is considered fair. 1 contaminant(s) exceed EPA maximum contaminant levels and 75 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Groton's water?
Of the 32 contaminants tested in Groton's water supply, the most notable include Copper (90th percentile), Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Groton have any water quality violations?
Yes, Groton has 75 EPA violation(s) on record, with the most recent in 2013. Violation types include MR, MCL, Other. 5 of these are health-based violations, which are the most serious category.
Do I need a water filter in Groton?
Based on EPA data, using a water filter in Groton 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 Groton's tap water come from?
Groton's drinking water is sourced from groundwater and supplied by GROTON WATER DEPARTMENT and 1 other water system(s). The system serves approximately 7,309 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Groton'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. Groton'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 Groton's water compare to other cities in Massachusetts?
Groton's water quality score of 43/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our Massachusetts state page to see how all cities in the state compare.
What should I do if I'm concerned about Groton's water quality?
If you have concerns about Groton'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 (GROTON WATER DEPARTMENT) 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.