Learn About Your Lake
Lake Health Report Cards
Updated report cards are now available! Please note that only report cards were updates for lakes that are currently monitored. Click in the lake name links below to find out more.
Water Quality Data
Since 1992, Snohomish County surface water management (SWM) has worked with citizen volunteers to monitor lake water quality in about 40 lowland lakes. Current and historical lake water quality data are available online in SWM’s interactive Water Quality Database.
Lake Reports
Snohomish County’s State of the Lakes Report (2003) summarizes the results of SWM’s lake monitoring performed from 1992 through 2002, as well as occasional monitoring from the mid-1970s. In addition, the report contains detailed monitoring summaries for 35 lakes. Annual update reports provide updated water quality monitoring information for each individual lake as new monitoring data are collected.
Individual Lake Resources
Toxic Algae Alerts
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Lakes experiencing toxic algae blooms are listed below and have been posted with WARNING signs. The WA State toxin testing program is closed for the winter, WARNING signs are posted when scum is present.
BLACKMANS LAKE
1/20/2021 - Blackmans Lake is experiencing intermittent blue-green algae blooms with green scum near the shoreline. Previous sample results how that Microcystin, a liver toxin, were detected at 22 ppb. This is above the WA state Recreational limits of 8 ppb. If you would like to sign up for alerts, please visit the City of Snohomish website and sign up for NewsFlash updates.
LAKE HOWARD
1/20/2021 - Lake Howard is experiencing heavy blue-green algae bloom along the shoreline near the boat launch. Previous algae samples contained species known to produce liver toxins and neurotoxins.
LOST LAKE
1/20/2021 - Lost Lake is experiencing an intermittent blue-green algae bloom along the shoreline. Previous algae samples contained species known to produce liver toxins.
MARTHA LAKE (North)
1/20/2021 - Lake Martha is experiencing blue-green algae bloom along the shoreline near the boat launch and the outlet cove. Algae samples contained species known to produce liver toxins and neurotoxins.
LAKE SHOECRAFT
1/20/2021 - Lake Shoecraft is experiencing intermittent blue-green algae bloom along the western shoreline. Previous algae samples contained species known to produce neurotoxins.
Please follow the guidelines on the WARNING sign when recreating.
Contact Us
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Marisa Burghdoff
Water Quality Specialist
Ph: 425-388-3204
Jen Oden
Water Quality Specialist
Ph: 425-262-2601
Katie Ruthenberg
Water Quality Analyst
Ph: 425-262-2907
email us at lakes@snoco.org