Twin Harbors domoic acid levels

Visit the Twin Harbors page for directions, harvest information, and more.

Domoic acid, a naturally occurring toxin produced by certain types of algae, can be harmful or even fatal to humans if contaminated shellfish is consumed.  The Washington Department of Fish and Wildlife (WDFW) routinely provides razor clams from various ocean beaches to the Washington Department of Health to test for domoic acid.

State public health officials have set the maximum threshold for domoic acid levels in razor clams at 20 parts per million.

See domoic acid levels at Long Beach, Copalis, Mocrocks, Kalaloch, and Willapa Spits.

On desktop/laptop, move the cursor over a data point to see the exact date and level. To zoom in or out on the chart, use the mouse scroll wheel. Click and drag the graph to pan the data left or right.

On touch devices, tap the data point to see the exact date and level. To zoom in or out on the chart, spread or pinch the chart area. Tap and drag the graph to pan the data left or right.
All domoic acid readings in ascending order of sample date
Sample Date Level (ppm)
9/21/2020 4
9/10/2020 5
9/2/2020 2
8/20/2020 5
5/14/2020 1
3/22/2020 4
3/11/2020 3
2/24/2020 2
2/12/2020 4
1/25/2020 5
1/13/2020 6
12/28/2019 7
12/16/2019 4
11/30/2019 4
11/21/2019 6
11/1/2019 3
10/24/2019 6
10/20/2019 6
10/15/2019 5
9/16/2019 1
8/26/2019 3
7/22/2019 1
6/3/2019 3
4/11/2019 5
3/27/2019 7
3/16/2019 4
3/7/2019 5
2/19/2019 6
1/21/2019 7
1/6/2019 5
12/23/2018 3
12/8/2018 3
11/25/2018 2
11/11/2018 2
10/29/2018 1
10/16/2018 1
10/3/2018 1
9/27/2018 1
8/9/2018 2
6/25/2018 3
4/10/2018 5
4/3/2018 4
3/6/2018 5
2/26/2018 6
1/20/2018 6
1/14/2018 5
12/21/2017 7
12/13/2017 6
11/20/2017 8
11/12/2017 6
10/24/2017 8
10/16/2017 4
10/2/2017 10
9/25/2017 12
9/18/2017 12
8/8/2017 6
7/11/2017 8
6/12/2017 12
5/15/2017 36
5/2/2017 36
4/23/2017 13
4/16/2017 10
4/9/2017 10
4/2/2017 11
3/26/2017 9
3/16/2017 21
3/1/2017 17
2/13/2017 15
1/30/2017 13
1/24/2017 16
1/15/2017 20
1/9/2017 25
12/27/2016 17
12/12/2016 23
12/4/2016 25
11/29/2016 16
11/20/2016 13
11/13/2016 17
11/1/2016 19
10/23/2016 24
10/10/2016 14
10/4/2016 17
9/27/2016 14
9/19/2016 11
9/6/2016 5
8/23/2016 11
8/8/2016 6
7/25/2016 14
7/11/2016 8
6/20/2016 15
6/6/2016 20
4/26/2016 25
4/12/2016 22
3/30/2016 29
3/21/2016 30
3/8/2016 26
2/22/2016 37
2/11/2016 34
1/26/2016 53
1/13/2016 31
12/29/2015 33
12/15/2015 50
11/23/2015 36
11/9/2015 35
10/27/2015 56
10/12/2015 74
9/29/2015 44
9/15/2015 68
9/2/2015 61
8/18/2015 60
8/5/2015 38
7/22/2015 86
7/6/2015 99
6/16/2015 115
6/4/2015 152
6/4/2015 152
5/26/2015 169
5/26/2015 169
5/18/2015 42
5/18/2015 42
5/11/2015 39
5/7/2015 27
5/5/2015 15
4/30/2015 2
4/22/2015 1
2/22/2015 1
2/4/2015 1
1/21/2015 1
1/7/2015 1
12/22/2014 2
12/7/2014 1
11/23/2014 2
11/18/2014 2
10/27/2014 1
7/17/2014 2
6/26/2014 2
5/19/2014 2
5/4/2014 3
4/21/2014 3
4/7/2014 3
4/1/2014 2
3/19/2014 3
3/12/2014 3
2/20/2014 3
1/31/2014 4
1/21/2014 2
1/9/2014 3
12/18/2013 3
12/5/2013 3
11/20/2013 2
11/6/2013 1
10/9/2013 1
9/28/2013 1
9/23/2013 1
9/2/2013 2
8/19/2013 1
8/5/2013 1
5/14/2013 1
4/29/2013 1
3/17/2013 1
2/27/2013 1
2/13/2013 1
1/29/2013 1
1/13/2013 2
12/31/2012 1
12/15/2012 1
12/2/2012 1
11/17/2012 1
11/4/2012 1
10/29/2012 1
10/16/2012 2
9/27/2012 1
9/4/2012 1
1/6/2011 1
9/21/2010 1
6/14/2010 1
6/1/2010 1
4/11/2010 1
3/17/2010 1
2/16/2010 1
2/9/2010 2
1/29/2010 2
1/19/2010 1
1/12/2010 2
12/20/2009 1
12/14/2009 1
11/22/2009 3
10/12/2009 3
10/4/2009 4
9/28/2009 1
9/21/2009 3
8/16/2009 3
8/16/2009 3
8/16/2009 3
8/11/2009 4
8/3/2009 3
7/23/2009 1
6/22/2009 1
5/26/2009 2
5/11/2009 1
4/23/2009 1
3/27/2009 1
3/17/2009 1
3/9/2009 1
1/28/2009 1
1/21/2009 1
12/29/2008 1
12/3/2008 1
11/23/2008 1
10/29/2008 1
12/12/2007 1
8/27/2007 1
7/30/2007 1
7/3/2007 1
6/18/2007 4
6/12/2007 3
5/21/2007 3
5/4/2007 4
4/26/2007 3
4/12/2007 3
4/4/2007 3
3/7/2007 4
2/28/2007 4
2/3/2007 4
1/28/2007 4
1/15/2007 1
12/18/2006 2
11/27/2006 2
11/20/2006 2
10/30/2006 1
10/22/2006 1
10/2/2006 2
9/25/2006 2
9/11/2006 2
8/28/2006 3
8/14/2006 5
7/31/2006 3
7/24/2006 5
7/17/2006 3
7/11/2006 4
6/26/2006 2
6/12/2006 2
5/30/2006 2
5/15/2006 4
4/23/2006 4
4/14/2006 2
3/20/2006 2
3/13/2006 1
2/15/2006 4
2/8/2006 5
1/30/2006 2
1/17/2006 1
1/10/2006 1
12/19/2005 1
12/12/2005 3
11/6/2005 9
10/30/2005 7
10/9/2005 11
10/2/2005 9
9/19/2005 2
9/6/2005 6
8/22/2005 2
8/9/2005 4
7/28/2005 2
7/11/2005 6
6/9/2005 5
5/27/2005 5
5/6/2005 8
5/2/2005 10
5/1/2005 18
4/29/2005 11
4/27/2005 14
4/23/2005 12
4/21/2005 6
4/20/2005 9
4/14/2005 3
3/31/2005 3
3/23/2005 9
3/6/2005 2
2/24/2005 3
2/12/2005 5
1/26/2005 6
1/13/2005 6
12/28/2004 7
12/21/2004 4
12/1/2004 5
11/23/2004 5
11/3/2004 4
10/27/2004 5
10/11/2004 5
10/3/2004 5
9/27/2004 4
9/13/2004 5
8/30/2004 3
8/9/2004 7
8/4/2004 8
7/20/2004 1
7/6/2004 1
6/21/2004 2
5/18/2004 4
5/3/2004 3
5/2/2004 3
4/25/2004 5
4/14/2004 6
4/5/2004 5
3/22/2004 8
3/10/2004 10
2/15/2004 5
2/9/2004 14
2/3/2004 10
1/20/2004 6
1/11/2004 17
1/4/2004 11
12/22/2003 4
12/14/2003 12
12/8/2003 7
11/23/2003 4
11/12/2003 2
10/20/2003 5
10/13/2003 10
10/6/2003 9
9/29/2003 18
9/22/2003 9
9/15/2003 12
9/8/2003 21
9/3/2003 19
8/25/2003 17
8/11/2003 17
7/15/2003 10
7/1/2003 27
6/16/2003 15
6/1/2003 33
5/20/2003 29
5/5/2003 38
4/21/2003 32
4/14/2003 36
4/7/2003 22
3/23/2003 63
3/17/2003 35
2/27/2003 69
2/13/2003 61
1/28/2003 59
1/16/2003 60
12/30/2002 44
12/17/2002 63
12/2/2002 70
11/18/2002 48
11/4/2002 52
10/20/2002 113
10/6/2002 60
9/30/2002 16
7/14/2002 3
6/17/2002 2
5/6/2002 4
4/21/2002 4
3/24/2002 3
2/21/2002 2
1/24/2002 5
12/6/2001 5
11/7/2001 4
10/10/2001 6
9/18/2001 9
9/11/2001 8
8/30/2001 8
7/25/2001 7
6/11/2001 10
5/7/2001 19
4/22/2001 20
3/11/2001 24
2/4/2001 3
1/24/2001 3
11/16/2000 5
10/20/2000 4
9/25/2000 5
8/16/2000 2
7/16/2000 5
6/8/2000 10
4/12/2000 5
3/22/2000 4
2/15/2000 19
1/17/2000 6
12/19/1999 7
11/13/1999 16
10/24/1999 22
9/23/1999 13
8/11/1999 21
7/19/1999 9
6/15/1999 10
5/17/1999 22
4/2/1999 36
3/1/1999 48
2/19/1999 52
1/3/1999 48