Algae - Detail search

Detailed search for your lake

This database contains the most current toxicity data available. All instances of values above the recreational guidelines are kept as up to date as possible, but values below the guidelines may be somewhat delayed in entry.Since there is a lag time from the date of sample to the date of analysis, be sure to check the sample date when looking at data or before you use the lake. Remember to use caution and avoid scums. "When in doubt, stay out!"

Your local jurisdiction may have more specific information about your lake. Questions? Contact toxicalgae at Department of Ecology.

If a lake is not listed, it has not been tested for toxic algae through the Ecology program.

The pins on the map represent the center of small lakes, regardless of where the sample was taken. To find more precise location information, download the toxin data and click the "view scum info" link. That is where specific sampling location information will be if it was provided. On larger lakes, (such as Lake Washington, Moses Lake and Potholes) pins represent the location of the sample if provided.

Toxin:

County	WRIA Number	Site	Collect Date	Parameter	Toxin Conc. (µg/L)	MDL (µg/L)	Above State Guideline	Additional Information	Sample Location	Ecology Tracking Number
Benton	40	Howard Amon Park (Columbia River)	08/24/2026	Anatoxin-a	645.000	0.010	Yes	No	Near Old Swim Dock	HOWABENT593_26_200
Benton	40	Howard Amon Park (Columbia River)	08/24/2026	Microcystin	<MDL	0.150	No	No	Near Old Swim Dock	HOWABENT593_26_200
Benton	40	Howard Amon Park (Columbia River)	09/08/2025	Anatoxin-a	36.400	1.000	Yes	No	Swimming Beach	HOWABENT593_25_339
Benton	40	Howard Amon Park (Columbia River)	09/02/2025	Anatoxin-a	21.000	0.500	Yes	No	Near old swim dock	HOWABENT593_25_314
Benton	40	Howard Amon Park (Columbia River)	08/25/2025	Anatoxin-a	9.340	0.200	Yes	No	near old swim dock	HOWABENT593_25_285
Benton	40	Howard Amon Park (Columbia River)	09/23/2024	Anatoxin-a	0.116	0.010	No	View	Swim Beach	HOWABENT593_24_336
Benton	40	Howard Amon Park (Columbia River)	09/23/2024	Microcystin	<MDL	0.300	No	View	Swim Beach	HOWABENT593_24_336
Benton	40	Howard Amon Park (Columbia River)	09/16/2024	Anatoxin-a	0.095	0.010	No	View	Swim Beach	HOWABENT593_24_304
Benton	40	Howard Amon Park (Columbia River)	09/16/2024	Microcystin	<MDL	0.300	No	View	Swim Beach	HOWABENT593_24_304
Benton	40	Howard Amon Park (Columbia River)	11/07/2023	Anatoxin-a	0.047	0.010	No	No	Swim Dock	HOWABENT593_23_441
Benton	40	Howard Amon Park (Columbia River)	11/07/2023	Microcystin	<MDL	0.150	No	No	Swim Dock	HOWABENT593_23_441
Benton	40	Howard Amon Park (Columbia River)	10/31/2023	Anatoxin-a	0.144	0.010	No	No	Swim Dock	HOWABENT593_23_431
Benton	40	Howard Amon Park (Columbia River)	10/23/2023	Anatoxin-a	1.170	0.010	Yes	View		HOWABENT593_23_411
Benton	40	Howard Amon Park (Columbia River)	10/17/2023	Anatoxin-a	0.076	0.010	No	View	human case site 1	HOWABENT593_23_386
Benton	40	Howard Amon Park (Columbia River)	10/17/2023	Anatoxin-a	<MDL	0.010	No	View		HOWABENT593_23_306
Benton	40	Howard Amon Park (Columbia River)	10/17/2023	Microcystin	1.270	0.150	No	View		HOWABENT593_23_306
Benton	40	Howard Amon Park (Columbia River)	10/09/2023	Anatoxin-a	3.170	0.010	Yes	No	Swim Dock	HOWABENT593_23_364
Benton	40	Howard Amon Park (Columbia River)	10/09/2023	Microcystin	<MDL	0.150	No	No	Swim Dock	HOWABENT593_23_364
Benton	40	Howard Amon Park (Columbia River)	10/03/2023	Anatoxin-a	1.520	0.010	Yes	No	boat lauch area	HOWABENT593_23_341
Benton	40	Howard Amon Park (Columbia River)	10/03/2023	Anatoxin-a	0.719	0.010	No	No	boat launch area (in weed layer)	HOWABENT593_23_342
Benton	40	Howard Amon Park (Columbia River)	09/25/2023	Anatoxin-a	0.317	0.010	No	No	Swim Dock	HOWABENT593_23_322
Benton	40	Howard Amon Park (Columbia River)	09/20/2023	Anatoxin-a	0.147	0.010	No	No		HOWABENT593_23_306
Benton	40	Howard Amon Park (Columbia River)	09/20/2023	Anatoxin-a	0.175	0.010	No	No		POINBENT5937_23_307
Benton	40	Howard Amon Park (Columbia River)	09/11/2023	Anatoxin-a	10.200	0.010	Yes	No	Swim Dock	HOWABENT593_23_265
Benton	40	Howard Amon Park (Columbia River)	09/11/2023	Anatoxin-a	0.529	0.010	No	No	Swim Dock	HOWABENT593_23_266
Benton	40	Howard Amon Park (Columbia River)	09/04/2023	Anatoxin-a	1.030	0.010	Yes	No	Swim Dock	HOWABENT593_23_247
Benton	40	Howard Amon Park (Columbia River)	08/29/2023	Anatoxin-a	58.500	0.010	Yes	No	Swim Dock	HOWABENT593_23_237
Benton	40	Howard Amon Park (Columbia River)	08/21/2023	Anatoxin-a	1.040	0.010	Yes	No	Howard Amon Swim Dock	HOWABENT593_23_195
Benton	40	Howard Amon Park (Columbia River)	08/15/2023	Anatoxin-a	11.400	0.010	Yes	View		HOWABENT593_23_180
Benton	40	Howard Amon Park (Columbia River)	10/31/2022	Anatoxin-a	0.180	0.010	No	View	Howard Amon Park	HOWABENT593_22_447
Benton	40	Howard Amon Park (Columbia River)	10/24/2022	Anatoxin-a	0.235	0.010	No	View	Richland Washington	HOWABENT593_22_438
Benton	40	Howard Amon Park (Columbia River)	10/17/2022	Anatoxin-a	0.610	0.010	No	View	Swim Dock	HOWABENT593_22_397
Benton	40	Howard Amon Park (Columbia River)	10/10/2022	Anatoxin-a	0.548	0.010	No	View		HOWABENT593_22_382
Benton	40	Howard Amon Park (Columbia River)	09/12/2022	Anatoxin-a	0.115	0.010	No	View	Swim Dock	HOWABENT593_22_314
Benton	40	Howard Amon Park (Columbia River)	08/15/2022	Anatoxin-a	<MDL	0.010	No	View		HOWABENT593_22_191
Benton	40	Howard Amon Park (Columbia River)	08/15/2022	Microcystin	<MDL	0.150	No	View		HOWABENT593_22_191
Benton	40	Howard Amon Park (Columbia River)	11/30/2021	Anatoxin-a	0.010	0.010	No	No		HOWABENT593
Benton	40	Howard Amon Park (Columbia River)	11/16/2021	Anatoxin-a	0.022	0.010	No	No		HOWABENT593
Benton	40	Howard Amon Park (Columbia River)	11/08/2021	Anatoxin-a	0.132	0.010	No	No		HOWABENT593
Benton	40	Howard Amon Park (Columbia River)	11/02/2021	Anatoxin-a	1.480	0.010	Yes	No		HOWABENT593
Benton	40	Howard Amon Park (Columbia River)	10/26/2021	Anatoxin-a	0.454	0.010	No	No		HOWABENT593
Benton	40	Howard Amon Park (Columbia River)	10/19/2021	Anatoxin-a	0.340	0.010	No	No		HOWABENT593
Benton	40	Howard Amon Park (Columbia River)	10/12/2021	Anatoxin-a	0.424	0.010	No	View	Richland Washington	HOWABENT593_21_509
Benton	40	Howard Amon Park (Columbia River)	10/04/2021	Anatoxin-a	0.542	0.010	No	View	Boat Launch	HOWABENT593_21_466
Benton	40	Howard Amon Park (Columbia River)	09/27/2021	Anatoxin-a	0.332	0.010	No	View		HOWABENT593_21_437
Benton	40	Howard Amon Park (Columbia River)	09/20/2021	Anatoxin-a	67.200	0.010	Yes	View	Howard Amon Park Beach	HOWABENT593_21_392
Benton	40	Howard Amon Park (Columbia River)	09/13/2021	Anatoxin-a	3.590	0.010	Yes	View		HOWABENT593_21_376
Benton	40	Howard Amon Park (Columbia River)	09/13/2021	Cylindrospermopsin	<MDL	0.025	No	View		HOWABENT593_21_376
Benton	40	Howard Amon Park (Columbia River)	09/13/2021	Microcystin	<MDL	0.150	No	View		HOWABENT593_21_376
Benton	40	Howard Amon Park (Columbia River)	09/13/2021	Saxitoxin	<MDL	0.020	No	View		HOWABENT593_21_376

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As of 6/26/2018 the format of the toxin and phytoplankton export has changed. A unique identification number has been added to each site.

Links to external sites do not constitute endorsements by King County. By visiting this and other King County web pages, you expressly agree to be bound by terms and conditions of the site. For questions on the Freshwater Algae Program please contact . For information or concerns about a current Algal Bloom please contact your local Health Department.