F14/100
Littleton Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 9,611 residents · Massachusetts
What's In Littleton's Tap Water?
32
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.70 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2023 – February 29, 2024Rule: Ground Water RuleEnforcement: Formal — state order issued
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
LITTLETON WATER DEPARTMENT
Population Served
9,611
Water Source
Groundwater
System ID
MA2158000
Frequently Asked Questions About Littleton Water
Is Littleton tap water safe to drink?
Littleton, Massachusetts tap water receives a grade of F (14/100), which is considered failing. 1 contaminant(s) exceed EPA maximum contaminant levels and 26 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Littleton's water?
Of the 32 contaminants tested in Littleton'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 Littleton have any water quality violations?
Yes, Littleton has 26 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, MCL, Other. 13 of these are health-based violations, which are the most serious category.
Do I need a water filter in Littleton?
Based on EPA data, using a water filter in Littleton 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 Littleton's tap water come from?
Littleton's drinking water is sourced from groundwater and supplied by LITTLETON WATER DEPARTMENT. The system serves approximately 9,611 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Littleton'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. Littleton'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 Littleton's water compare to other cities in Massachusetts?
Littleton's water quality score of 14/100 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 Littleton's water quality?
If you have concerns about Littleton'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 (LITTLETON 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.