A92/100
SUQUAMISH — Water Quality Report 2026
Serving 4,203 people · Washington
Water Source
Groundwater
County
—
System ID
WA5386400
Violations
5
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – February 24, 2025Enforcement: 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
Frequently Asked Questions About SUQUAMISH
Is SUQUAMISH water safe to drink?
SUQUAMISH water receives a grade of A (92/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has SUQUAMISH detected?
31 contaminants were tested in SUQUAMISH's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does SUQUAMISH have any EPA violations?
Yes, SUQUAMISH has 5 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, MR.
How many people does SUQUAMISH serve?
SUQUAMISH serves approximately 4,203 people, Washington.
What type of water does SUQUAMISH provide?
SUQUAMISH sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5386400.
How does SUQUAMISH compare to other utilities in Washington?
SUQUAMISH scores 92/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Washington state page for a full comparison of water systems.