F0/100
Leominster Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 41,683 residents · Massachusetts
What's In Leominster's Tap Water?
70
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.90 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2018.
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
LEOMINSTER WATER DIVISION
Population Served
41,683
Water Source
Surface Water
System ID
MA2153000
Frequently Asked Questions About Leominster Water
Is Leominster tap water safe to drink?
Leominster, Massachusetts tap water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA maximum contaminant levels and 137 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Leominster's water?
Of the 70 contaminants tested in Leominster'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 Leominster have any water quality violations?
Yes, Leominster has 137 EPA violation(s) on record, with the most recent in 2018. Violation types include MCL, MR, Other. 12 of these are health-based violations, which are the most serious category.
Do I need a water filter in Leominster?
Based on EPA data, using a water filter in Leominster 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 Leominster's tap water come from?
Leominster's drinking water is sourced from surface water and supplied by LEOMINSTER WATER DIVISION. The system serves approximately 41,683 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Leominster'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. Leominster'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 Leominster's water compare to other cities in Massachusetts?
Leominster's water quality score of 0/100 earns a grade of F, which is considered failing. This is a concerning score that suggests significant water quality issues. Visit our Massachusetts state page to see how all cities in the state compare.
What should I do if I'm concerned about Leominster's water quality?
If you have concerns about Leominster'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 (LEOMINSTER WATER DIVISION) 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.