C46/100
COSMOPOLIS WATER DEPARTMENT — Water Quality Report 2026
Serving 1,812 people · Washington
Water Source
Purchased Surface Water
County
—
System ID
WA5315050
Violations
51
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, 2023 – June 28, 2024Enforcement: 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 COSMOPOLIS WATER DEPARTMENT
Is COSMOPOLIS WATER DEPARTMENT water safe to drink?
COSMOPOLIS WATER DEPARTMENT water receives a grade of C (46/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 51 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has COSMOPOLIS WATER DEPARTMENT detected?
1 contaminants were tested in COSMOPOLIS WATER DEPARTMENT's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does COSMOPOLIS WATER DEPARTMENT have any EPA violations?
Yes, COSMOPOLIS WATER DEPARTMENT has 51 EPA violation(s) on record, with the most recent in 2023. Violation types include Other, MR.
How many people does COSMOPOLIS WATER DEPARTMENT serve?
COSMOPOLIS WATER DEPARTMENT serves approximately 1,812 people, Washington.
What type of water does COSMOPOLIS WATER DEPARTMENT provide?
COSMOPOLIS WATER DEPARTMENT sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WA5315050.
How does COSMOPOLIS WATER DEPARTMENT compare to other utilities in Washington?
COSMOPOLIS WATER DEPARTMENT scores 46/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Washington state page for a full comparison of water systems.