COUNTY WATER-SYSTEM LEDGER
Napa, California
EPA’s September 2026 export lists 5 active community water systems serving Napa, California, with 3 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Napa, California
EPA associates 5 covered systems with Napa, California; their reported population-served values total 120,024 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Napa, City OfCA2810003 | 84,804 | Surface water | No current violation flagged |
| American Canyon, City OfCA2810005 | 21,437 | Surface water | Current monitoring/reporting flag |
| Calistoga, City OfCA2810002 | 5,610 | Surface water | Current monitoring/reporting flag |
| St. Helena, City OfCA2810004 | 5,386 | Surface water | Current monitoring/reporting flag |
| Town Of YountvilleCA2810007 | 2,787 | Surface water purchased | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Napa, California
EPA classifies 5 systems serving Napa, California across 2 primary-source categories; Surface water is the largest category with 4 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.