B71/100
Belmont Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 27,295 residents · Massachusetts
What's In Belmont's Tap Water?
69
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Monitoring / Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: June 1, 2023Rule: 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
BELMONT WATER DEPT. (MWRA)
Population Served
27,295
Water Source
Purchased Surface Water
System ID
MA3026000
Frequently Asked Questions About Belmont Water
Is Belmont tap water safe to drink?
Belmont, Massachusetts tap water receives a grade of B (71/100), which is considered good. Out of 69 contaminants tested, none 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 Belmont's water?
Of the 69 contaminants tested in Belmont's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Belmont have any water quality violations?
Yes, Belmont has 6 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, TT. 5 of these are health-based violations, which are the most serious category.
Do I need a water filter in Belmont?
Belmont water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Belmont's tap water come from?
Belmont's drinking water is sourced from purchased surface water and supplied by BELMONT WATER DEPT. (MWRA). The system serves approximately 27,295 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Belmont'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. Belmont'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 Belmont's water compare to other cities in Massachusetts?
Belmont's water quality score of 71/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Massachusetts state page to see how all cities in the state compare.
What should I do if I'm concerned about Belmont's water quality?
If you have concerns about Belmont'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 (BELMONT WATER DEPT. (MWRA)) 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.