C46/100
Vashon Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 5,774 residents · Washington
What's In Vashon's Tap Water?
51
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
1
Health-Related
TIER 2Resolved
Failed treatment technique requirements
When: August 1, 2025 – August 31, 2025Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
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
HEIGHTS WATER
Population Served
2,051
Water Source
Groundwater
System ID
WA5332300
WATER DISTRICT 19
Population Served
3,723
Water Source
Surface Water
System ID
WA5338900
Frequently Asked Questions About Vashon Water
Is Vashon tap water safe to drink?
Vashon, Washington tap water receives a grade of C (46/100), which is considered fair. 0 contaminant(s) exceed EPA maximum contaminant levels and 116 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Vashon's water?
Of the 51 contaminants tested in Vashon'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 Vashon have any water quality violations?
Yes, Vashon has 116 EPA violation(s) on record, with the most recent in 2025. Violation types include TT, Other, MCL. 5 of these are health-based violations, which are the most serious category.
Do I need a water filter in Vashon?
Vashon 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 Vashon's tap water come from?
Vashon's drinking water is sourced from groundwater and supplied by HEIGHTS WATER and 1 other water system(s). The system serves approximately 5,774 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Vashon'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. Vashon'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 Vashon's water compare to other cities in Washington?
Vashon's water quality score of 46/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our Washington state page to see how all cities in the state compare.
What should I do if I'm concerned about Vashon's water quality?
If you have concerns about Vashon'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 (HEIGHTS WATER) 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.