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
Walla Walla	32	McNary Slough	08/25/2026	Anatoxin-a	<MDL	0.010	No	No	bridge	MCNAWALL334_26_216
Walla Walla	32	McNary Slough	08/25/2026	Microcystin	101.000	0.150	Yes	No	bridge	MCNAWALL334_26_216
Walla Walla	32	McNary Slough	09/29/2025	Anatoxin-a	0.017	0.010	No	No	Lot #8	MCNAWALL334_25_406
Walla Walla	32	McNary Slough	09/29/2025	Anatoxin-a	<MDL	0.010	No	No	East Side of Lake Road	MCNAWALL334_25_407
Walla Walla	32	McNary Slough	09/29/2025	Microcystin	<MDL	0.300	No	No	East Side of Lake Road	MCNAWALL334_25_407
Walla Walla	32	McNary Slough	09/29/2025	Microcystin	<MDL	0.300	No	No	Lot #8	MCNAWALL334_25_406
Walla Walla	32	McNary Slough	09/22/2025	Anatoxin-a	<MDL	0.010	No	No		MCNAWALL334_25_370
Walla Walla	32	McNary Slough	09/22/2025	Microcystin	<MDL	0.300	No	No		MCNAWALL334_25_370
Walla Walla	32	McNary Slough	09/15/2025	Anatoxin-a	<MDL	0.010	No	No	West side of Lake Rd Behind Visitors Center	MCNAWALL334_25_353
Walla Walla	32	McNary Slough	09/15/2025	Microcystin	24.800	0.300	Yes	No	West side of Lake Rd Behind Visitors Center	MCNAWALL334_25_353
Walla Walla	32	McNary Slough	09/08/2025	Anatoxin-a	<MDL	0.010	No	No		MCNAWALL334_25_321
Walla Walla	32	McNary Slough	09/08/2025	Microcystin	5.890	0.300	No	No		MCNAWALL334_25_321
Walla Walla	32	McNary Slough	09/02/2025	Anatoxin-a	<MDL	0.010	No	No		MCNAWALL334_25_304
Walla Walla	32	McNary Slough	09/02/2025	Microcystin	24.300	0.300	Yes	No		MCNAWALL334_25_304
Walla Walla	32	McNary Slough	08/25/2025	Anatoxin-a	<MDL	0.010	No	No	West side of Lake Rd	MCNAWALL334_25_274
Walla Walla	32	McNary Slough	08/25/2025	Microcystin	321.000	0.300	Yes	No	West side of Lake Rd	MCNAWALL334_25_274
Walla Walla	32	McNary Slough	10/28/2024	Microcystin	0.428	0.300	No	View	Lake Wallula	MCNAWALL334_24_441
Walla Walla	32	McNary Slough	10/08/2024	Anatoxin-a	<MDL	0.010	No	View	Hummorist Road East end	MCNAWALL334_24_379
Walla Walla	32	McNary Slough	10/08/2024	Microcystin	0.333	0.300	No	View	Hummorist Road East end	MCNAWALL334_24_379
Walla Walla	32	McNary Slough	09/30/2024	Anatoxin-a	<MDL	0.010	No	View	Behind Visitors Center	MCNAWALL334_24_346
Walla Walla	32	McNary Slough	09/30/2024	Microcystin	1.820	0.300	No	View	Behind Visitors Center	MCNAWALL334_24_346
Walla Walla	32	McNary Slough	09/09/2024	Anatoxin-a	<MDL	0.010	No	View	Behind Visitor Center	MCNAWALL334_24_289
Walla Walla	32	McNary Slough	09/09/2024	Microcystin	4.100	0.300	No	View	Behind Visitor Center	MCNAWALL334_24_289
Walla Walla	32	McNary Slough	08/28/2023	Anatoxin-a	<MDL	0.010	No	No	McNary Slough 4	MCNAWALL334_23_228
Walla Walla	32	McNary Slough	08/28/2023	Microcystin	4.440	0.150	No	No	McNary Slough 4	MCNAWALL334_23_228
Walla Walla	32	McNary Slough	08/14/2023	Anatoxin-a	<MDL	0.010	No	View	Slough 4 South shore	MCNAWALL334_23_166
Walla Walla	32	McNary Slough	08/14/2023	Microcystin	4.870	0.150	No	View	Slough 4 South shore	MCNAWALL334_23_166
Walla Walla	32	McNary Slough	07/31/2023	Anatoxin-a	<MDL	0.010	No	View	McNary Slough 4	MCNAWALL334_23_118
Walla Walla	32	McNary Slough	07/31/2023	Microcystin	35.800	0.150	Yes	View	McNary Slough 4	MCNAWALL334_23_118
Walla Walla	32	McNary Slough	07/18/2023	Anatoxin-a	<MDL	0.010	No	View		MCNAWALL334_23_091
Walla Walla	32	McNary Slough	07/18/2023	Microcystin	8.600	0.150	Yes	View		MCNAWALL334_23_091
Walla Walla	32	McNary Slough	10/26/2022	Anatoxin-a	0.091	0.010	No	View	McNary Slough #4	MCNAWALL334_22_444
Walla Walla	32	McNary Slough	10/26/2022	Anatoxin-a	0.286	0.010	No	View	McNary Slough #3	MCNAWALL334_22_443
Walla Walla	32	McNary Slough	10/26/2022	Microcystin	2.050	0.150	No	View	McNary Slough #3	MCNAWALL334_22_443
Walla Walla	32	McNary Slough	10/26/2022	Microcystin	4.160	0.150	No	View	McNary Slough #4	MCNAWALL334_22_444
Walla Walla	32	McNary Slough	10/19/2022	Anatoxin-a	0.214	0.010	No	View	McNary Slough #4	MCNAWALL334_22_418
Walla Walla	32	McNary Slough	10/19/2022	Anatoxin-a	0.618	0.010	No	View	McNary Slough #3	MCNAWALL334_22_417
Walla Walla	32	McNary Slough	10/19/2022	Microcystin	3.620	0.150	No	View	McNary Slough #3	MCNAWALL334_22_417
Walla Walla	32	McNary Slough	10/19/2022	Microcystin	2.970	0.150	No	View	McNary Slough #4	MCNAWALL334_22_418
Walla Walla	32	McNary Slough	10/12/2022	Anatoxin-a	0.901	0.010	No	View	McNary Slough #3	MCNAWALL334_22_391
Walla Walla	32	McNary Slough	10/12/2022	Anatoxin-a	0.293	0.010	No	View	McNary Slough #4	MCNAWALL334_22_389
Walla Walla	32	McNary Slough	10/12/2022	Microcystin	1.620	0.150	No	View	McNary Slough #4	MCNAWALL334_22_389
Walla Walla	32	McNary Slough	10/12/2022	Microcystin	2.050	0.150	No	View	McNary Slough #3	MCNAWALL334_22_391
Walla Walla	32	McNary Slough	10/05/2022	Anatoxin-a	0.156	0.010	No	View	McNary Slough #4	MCNAWALL334_22_370
Walla Walla	32	McNary Slough	10/05/2022	Anatoxin-a	1.340	0.010	Yes	View	Sough #3 East side of Lake Rd	MCNAWALL334_22_369
Walla Walla	32	McNary Slough	10/05/2022	Microcystin	4.670	0.150	No	View	Sough #3 East side of Lake Rd	MCNAWALL334_22_369
Walla Walla	32	McNary Slough	10/05/2022	Microcystin	20.600	0.150	Yes	View	McNary Slough #4	MCNAWALL334_22_370
Walla Walla	32	McNary Slough	09/28/2022	Anatoxin-a	<MDL	0.010	No	View	McNary Hunting Slough #2	MCNAWALL334_22_351
Walla Walla	32	McNary Slough	09/28/2022	Anatoxin-a		0.010	No	View	Sough #3 East side of Lake Rd	MCNAWALL334_22_349
Walla Walla	32	McNary Slough	09/28/2022	Anatoxin-a		0.010	No	View	McNary Slough #4	MCNAWALL334_22_350
Walla Walla	32	McNary Slough	09/28/2022	Microcystin	23.400	0.150	Yes	View	McNary Slough #4	MCNAWALL334_22_350
Walla Walla	32	McNary Slough	09/28/2022	Microcystin	2.410	0.150	No	View	Sough #3 East side of Lake Rd	MCNAWALL334_22_349
Walla Walla	32	McNary Slough	09/28/2022	Microcystin	2.270	0.150	No	View	McNary Hunting Slough #2	MCNAWALL334_22_351
Walla Walla	32	McNary Slough	09/19/2022	Anatoxin-a	0.615	0.010	No	View	McNary Slough #4	MCNAWALL334_22_320
Walla Walla	32	McNary Slough	09/19/2022	Anatoxin-a	0.875	0.010	No	View	McNary Slough #3	MCNAWALL334_22_321
Walla Walla	32	McNary Slough	09/19/2022	Microcystin	17.500	0.150	Yes	View	McNary Slough #3	MCNAWALL334_22_321
Walla Walla	32	McNary Slough	09/19/2022	Microcystin	13.100	0.150	Yes	View	McNary Slough #4	MCNAWALL334_22_320
Walla Walla	32	McNary Slough	09/01/2022	Anatoxin-a	2.820	0.010	Yes	View	McNary Slough #3	MCNAWALL334_22_277
Walla Walla	32	McNary Slough	09/01/2022	Anatoxin-a	0.147	0.010	No	View	McNary Slough #4	MCNAWALL334_22_278
Walla Walla	32	McNary Slough	09/01/2022	Anatoxin-a	<MDL	0.010	No	View	McNary Headquarters Unit Lot E #8	MCNAWALL334_22_276
Walla Walla	32	McNary Slough	09/01/2022	Microcystin	0.152	0.150	No	View	McNary Headquarters Unit Lot E #8	MCNAWALL334_22_276
Walla Walla	32	McNary Slough	09/01/2022	Microcystin	38.200	0.150	Yes	View	McNary Slough #4	MCNAWALL334_22_278
Walla Walla	32	McNary Slough	09/01/2022	Microcystin	9.350	0.150	Yes	View	McNary Slough #3	MCNAWALL334_22_277
Walla Walla	32	McNary Slough	08/26/2022	Anatoxin-a	0.012	0.010	No	View	Hood Park West boat launch McNary WLR	MCNAWALL334_22_259
Walla Walla	32	McNary Slough	08/26/2022	Microcystin	<MDL	0.150	No	View	Hood Park West boat launch McNary WLR	MCNAWALL334_22_259
Walla Walla	32	McNary Slough	08/24/2022	Anatoxin-a	0.156	0.010	No	View	Slough #4, Wes side of Lake Rd Bridge	MCNAWALL334_22_254
Walla Walla	32	McNary Slough	08/24/2022	Anatoxin-a	1.630	0.010	Yes	View	Slough #3, North of Humorist Rd	MCNAWALL334_22_255
Walla Walla	32	McNary Slough	08/24/2022	Microcystin	10.100	0.150	Yes	View	Slough #3, North of Humorist Rd	MCNAWALL334_22_255
Walla Walla	32	McNary Slough	08/24/2022	Microcystin	48.600	0.150	Yes	View	Slough #4, Wes side of Lake Rd Bridge	MCNAWALL334_22_254
Walla Walla	32	McNary Slough	08/16/2022	Anatoxin-a	0.480	0.010	No	View	East side of Lake Rd Bridge	MCNAWALL334_22_211
Walla Walla	32	McNary Slough	08/16/2022	Cylindrospermopsin	<MDL	0.025	No	View	East side of Lake Rd Bridge	MCNAWALL334_22_211
Walla Walla	32	McNary Slough	08/16/2022	Microcystin	27.200	0.150	Yes	View	East side of Lake Rd Bridge	MCNAWALL334_22_211
Walla Walla	32	McNary Slough	08/16/2022	Saxitoxin	0.024	0.020	No	View	East side of Lake Rd Bridge	MCNAWALL334_22_211
Walla Walla	32	McNary Slough	08/08/2022	Anatoxin-a	0.462	0.010	No	View	Slough #3	MCNAWALL334_22_172
Walla Walla	32	McNary Slough	08/08/2022	Anatoxin-a	0.124	0.010	No	View	Slough #4	MCNAWALL334_22_170
Walla Walla	32	McNary Slough	08/08/2022	Cylindrospermopsin	<MDL	0.025	No	View	Slough #4	MCNAWALL334_22_170
Walla Walla	32	McNary Slough	08/08/2022	Cylindrospermopsin	<MDL	0.025	No	View	Slough #3	MCNAWALL334_22_172
Walla Walla	32	McNary Slough	08/08/2022	Microcystin	16.800	0.150	Yes	View	Slough #3	MCNAWALL334_22_172
Walla Walla	32	McNary Slough	08/08/2022	Microcystin	31.400	0.150	Yes	View	Slough #4	MCNAWALL334_22_170
Walla Walla	32	McNary Slough	08/08/2022	Saxitoxin	<MDL	0.020	No	View	Slough #4	MCNAWALL334_22_170
Walla Walla	32	McNary Slough	08/08/2022	Saxitoxin	0.028	0.020	No	View	Slough #3	MCNAWALL334_22_172
Walla Walla	32	McNary Slough	09/09/2019	Anatoxin-a	0.336	0.010	No	No		MCNAWALL334_19_268
Walla Walla	32	McNary Slough	09/09/2019	Anatoxin-a	0.191	0.010	No	No		MCNAWALL334_19_269
Walla Walla	32	McNary Slough	09/09/2019	Microcystin	8.410	0.150	Yes	No		MCNAWALL334_19_269
Walla Walla	32	McNary Slough	09/09/2019	Microcystin	4.200	0.150	No	No		MCNAWALL334_19_268
Walla Walla	32	McNary Slough	06/18/2019	Anatoxin-a	<MDL	0.010	No	No		SLOUWALL334_19_049
Walla Walla	32	McNary Slough	06/18/2019	Cylindrospermopsin	<MDL	0.025	No	No		SLOUWALL334_19_049
Walla Walla	32	McNary Slough	06/18/2019	Microcystin	0.243	0.150	No	No		SLOUWALL334_19_049
Walla Walla	32	McNary Slough	06/18/2019	Saxitoxin	0.033	0.020	No	No		SLOUWALL334_19_049

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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.

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