D38/100
West Yarmouth Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 38,900 residents · Massachusetts
What's In West Yarmouth's Tap Water?
63
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
Failed to conduct Level 1 Assessment
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: April 6, 2021Rule: Consumer Confidence 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
YARMOUTH WATER DEPARTMENT
Population Served
38,900
Water Source
Groundwater
System ID
MA4351000
Frequently Asked Questions About West Yarmouth Water
Is West Yarmouth tap water safe to drink?
West Yarmouth, Massachusetts tap water receives a grade of D (38/100), which is considered poor. 0 contaminant(s) exceed EPA maximum contaminant levels and 31 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in West Yarmouth's water?
Of the 63 contaminants tested in West Yarmouth'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 West Yarmouth have any water quality violations?
Yes, West Yarmouth has 31 EPA violation(s) on record, with the most recent in 2021. Violation types include MR, RPT, TT. 7 of these are health-based violations, which are the most serious category.
Do I need a water filter in West Yarmouth?
West Yarmouth 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 West Yarmouth's tap water come from?
West Yarmouth's drinking water is sourced from groundwater and supplied by YARMOUTH WATER DEPARTMENT. The system serves approximately 38,900 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is West Yarmouth'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. West Yarmouth'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 West Yarmouth's water compare to other cities in Massachusetts?
West Yarmouth's water quality score of 38/100 earns a grade of D, which is considered poor. 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 West Yarmouth's water quality?
If you have concerns about West Yarmouth'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 (YARMOUTH 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.