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State Water Board previews redesigned Safe2Swim map and BeachWatch data changes

Coastal Beach Water Quality Work Group · November 21, 2025
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Summary

State Water Board staff showed a prototype of Safe2Swim that consolidates BeachWatch, SEED/CDN and other monitoring sources into a dashboard with site safety statuses, controlled vocabularies, new bulk-upload fields and server-side validation; staff aim for testing in November–December and a public go-live in late winter or early spring.

Michelle Tang, research data specialist in the State Water Board’s Office of Information Management and Analysis, demonstrated a prototype of a redesigned Safe2Swim public map aimed at making beach bacteria monitoring data easier to find and interpret.

Tang said the map combines monitoring from BeachWatch, SEED/CDN and a Central Valley E. coli map in a single interface that uses recent single-sample results plus a calculated six-week geometric mean to assign site statuses: “blue for low risk, orange for use caution, and gray for not enough data,” she said. The dashboard includes a site panel with coordinates, last sample date…

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