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Public Water System
CITY OF RIO VISTA
PWSID CA4810004 · California · 10,489 people served
A
ExcellentCITY OF RIO VISTA is an EPA-regulated public water system in California (PWSID CA4810004). It serves an estimated 10,489 residents — a small city of customers — across 1 community across 1 ZIP code.
CITY OF RIO VISTA has maintained full EPA Safe Drinking Water Act compliance over the most recent five-year reporting window. No health-based Maximum Contaminant Level (MCL) exceedances are on record. The grade of A reflects this clean compliance history.
Service Area
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Centered on the averaged ZIP-code centroid of 1 ZIP served.
Population
10,489
Cities
1
ZIPs
1
Violations
0
EPA Health-Based Violations
Health-based Maximum Contaminant Level (MCL) violations on file for CITY OF RIO VISTA over the past five years of EPA SDWIS reporting.
✅
No health-based violations in the last 5 years.
CITY OF RIO VISTA's water systems have met EPA health-based Maximum Contaminant Level (MCL) requirements throughout the EPA reporting window. This does not mean zero detection of regulated contaminants — it means all measured concentrations remained below their federal action levels.
Cities Served by CITY OF RIO VISTA
ZIP Codes Served
About this system
EPA records this system as PWSID CA4810004. Data reflects the most recent EPA SDWIS publication as of 2026-05-18. Public Water System Identifiers (PWSIDs) are assigned by the EPA's Safe Drinking Water Act program to track every regulated water utility in the United States. The first two letters typically indicate the state primacy agency. For real-time water quality information, contact CITY OF RIO VISTA directly or review their annual Consumer Confidence Report (CCR).
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