F19/100
ROSARIO — Water Quality Report 2026
Serving 1,031 people · Washington
Water Source
Surface Water
County
—
System ID
WA5374270
Violations
50
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2010.
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 ROSARIO
Is ROSARIO water safe to drink?
ROSARIO water receives a grade of F (19/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 50 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has ROSARIO detected?
1 contaminants were tested in ROSARIO's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does ROSARIO have any EPA violations?
Yes, ROSARIO has 50 EPA violation(s) on record, with the most recent in 2010. Violation types include MR, TT. 7 are health-based violations.
How many people does ROSARIO serve?
ROSARIO serves approximately 1,031 people, Washington.
What type of water does ROSARIO provide?
ROSARIO sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WA5374270.
How does ROSARIO compare to other utilities in Washington?
ROSARIO scores 19/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Washington state page for a full comparison of water systems.