A concise snapshot of current and recent water conditions. Data from the DCR Water Quality site.
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This is the official status for Shannon Beach specifically, based on single samples and the cumulative geometric mean of recent results. As always, swim at your own risk and at the discretion of your own best judgement!
⚠️ Recent CSO Incidents
Combined Sewage Overflow events reported in the Winchester area affecting Mystic Lake within the last 2 weeks.
Geometric Mean Test Results
Single Sample Test Results
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Official water quality monitoring is just beginning for the season. No readings have been posted yet for this year. Sampling typically runs weekly from Memorial Day through Labor Day.