Rosario
EPA ID: WA5374270 · 1,426 people served · 2 ZIP codes
ZipCheckup's reading of EPA SDWIS for Rosario (WA5374270): no EPA violations recorded in the last five years. For the full five-year period covered by EPA monitoring, Rosario has supplied tap water to 1,426 residents with no violations of any type on record.
Data: EPA SDWIS
Service Area Map
Coverage area for Rosario Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Rosario serves a community with a median household income of $77,665 and an estimated 4,856 residents across its service area. Approximately 46% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Rosario's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
Infrastructure Risk
Comparable Water Systems
Similar-sized systems in Washington
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Rosario (EPA ID: WA5374270) is a community water system in Washington that serves approximately 1,426 people from surface water sources.
This system provides water to 2 ZIP codes across 2 communities.
Violation History
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.0045 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by WA or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Rosario (WA5374270) on EPA.gov.
Frequently Asked Questions
Is Rosario water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Rosario in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Rosario serve?
Rosario serves approximately 1,426 people across 2 ZIP codes in Washington.
Where does Rosario get its water?
The primary water source is surface water.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Rosario Water Quality Report, WA. https://zipcheckup.com/water-system/wa5374270/
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author = {{ZipCheckup}},
title = {{Rosario Water Quality Report, WA}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/wa5374270/}
}