Domoic Acid Levels

Razor clam toxin testing

Washington Razor Clam Domoic Acid Levels

Long Beach

Latest Domoic Acid Test
22.0 ppm
At or above 20 ppm threshold

Sampled

Regulatory threshold: 20 ppm

Past measurements
  • 22.0 ppm
  • 5.0 ppm
  • 1.0 ppm
  • 1.0 ppm
  • 2.0 ppm
  • 2.0 ppm
  • 2.0 ppm
  • 2.0 ppm
  • 3.0 ppm
  • 2.0 ppm
  • 3.0 ppm
  • 2.0 ppm
  • 3.0 ppm
  • 3.0 ppm

Twin Harbors

Latest Domoic Acid Test
18.0 ppm
Below 20 ppm threshold

Sampled

Regulatory threshold: 20 ppm

Past measurements
  • 18.0 ppm
  • 3.0 ppm
  • 2.0 ppm
  • 3.0 ppm
  • 2.0 ppm
  • 3.0 ppm
  • 2.0 ppm
  • 3.0 ppm
  • 3.0 ppm
  • 2.0 ppm
  • 4.0 ppm
  • 4.0 ppm
  • 4.0 ppm
  • 3.0 ppm

Copalis

Latest Domoic Acid Test
9.0 ppm
Below 20 ppm threshold

Sampled

Regulatory threshold: 20 ppm

Past measurements
  • 9.0 ppm
  • 5.0 ppm
  • 4.0 ppm
  • 2.0 ppm
  • 1.0 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 1.0 ppm
  • 1.0 ppm
  • 1.0 ppm
  • 1.0 ppm
  • 1.0 ppm
  • 2.0 ppm

Mocrocks

Latest Domoic Acid Test
8.0 ppm
Below 20 ppm threshold

Sampled

Regulatory threshold: 20 ppm

Past measurements
  • 8.0 ppm
  • 6.0 ppm
  • 4.0 ppm
  • 2.0 ppm
  • 1.0 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 0.5 ppm
  • 1.0 ppm
  • 1.0 ppm
  • 1.0 ppm
  • 1.0 ppm
  • 1.0 ppm

Kalaloch

Latest available WDFW sample
2.0 ppm
Below 20 ppm threshold

Sampled

This test result is older than 45 days.

Regulatory threshold: 20 ppm

State public health officials consider domoic acid levels of 20 ppm and above unsafe for human consumption. A reading alone does not indicate that harvesting is approved or a beach is open.

Source: Washington Department of Fish & Wildlife. Razor clams are collected by WDFW and analyzed by the Washington Department of Health.

WDFW sample history

Domoic Acid History Chart

Long Beach

Latest measurement: 22.0 ppm
Sampled

At or above 20 ppm threshold

Long Beach domoic acid measurements over time ppm 0 6.3 12.7 19 25.3 20 ppm threshold Long Beach, November 21, 2025, 3.0 ppm. Below 20 ppm threshold Long Beach, December 5, 2025, 3.0 ppm. Below 20 ppm threshold Long Beach, December 19, 2025, 2.0 ppm. Below 20 ppm threshold Long Beach, January 5, 2026, 3.0 ppm. Below 20 ppm threshold Long Beach, January 20, 2026, 2.0 ppm. Below 20 ppm threshold Long Beach, February 3, 2026, 3.0 ppm. Below 20 ppm threshold Long Beach, February 15, 2026, 2.0 ppm. Below 20 ppm threshold Long Beach, March 2, 2026, 2.0 ppm. Below 20 ppm threshold Long Beach, March 22, 2026, 2.0 ppm. Below 20 ppm threshold Long Beach, April 6, 2026, 2.0 ppm. Below 20 ppm threshold Long Beach, April 22, 2026, 1.0 ppm. Below 20 ppm threshold Long Beach, May 6, 2026, 1.0 ppm. Below 20 ppm threshold Long Beach, September 11, 2026, 5.0 ppm. Below 20 ppm threshold Long Beach, September 30, 2026, 22.0 ppm. At or above 20 ppm threshold Nov 25 Mar 26 Sep 26 Sample date

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Measurement data table
Long Beach measurements — 1 year
Sample dateDomoic acid (ppm)Threshold comparison
November 21, 20253.0Below 20 ppm threshold
December 5, 20253.0Below 20 ppm threshold
December 19, 20252.0Below 20 ppm threshold
January 5, 20263.0Below 20 ppm threshold
January 20, 20262.0Below 20 ppm threshold
February 3, 20263.0Below 20 ppm threshold
February 15, 20262.0Below 20 ppm threshold
March 2, 20262.0Below 20 ppm threshold
March 22, 20262.0Below 20 ppm threshold
April 6, 20262.0Below 20 ppm threshold
April 22, 20261.0Below 20 ppm threshold
May 6, 20261.0Below 20 ppm threshold
September 11, 20265.0Below 20 ppm threshold
September 30, 202622.0At or above 20 ppm threshold
Twin Harbors

Latest measurement: 18.0 ppm
Sampled

Below 20 ppm threshold

Twin Harbors domoic acid measurements over time ppm 0 5.8 11.5 17.3 23 20 ppm threshold Twin Harbors, November 21, 2025, 3.0 ppm. Below 20 ppm threshold Twin Harbors, December 5, 2025, 4.0 ppm. Below 20 ppm threshold Twin Harbors, December 21, 2025, 4.0 ppm. Below 20 ppm threshold Twin Harbors, January 5, 2026, 4.0 ppm. Below 20 ppm threshold Twin Harbors, January 18, 2026, 2.0 ppm. Below 20 ppm threshold Twin Harbors, February 3, 2026, 3.0 ppm. Below 20 ppm threshold Twin Harbors, February 15, 2026, 3.0 ppm. Below 20 ppm threshold Twin Harbors, March 2, 2026, 2.0 ppm. Below 20 ppm threshold Twin Harbors, March 22, 2026, 3.0 ppm. Below 20 ppm threshold Twin Harbors, April 6, 2026, 2.0 ppm. Below 20 ppm threshold Twin Harbors, April 22, 2026, 3.0 ppm. Below 20 ppm threshold Twin Harbors, May 6, 2026, 2.0 ppm. Below 20 ppm threshold Twin Harbors, September 11, 2026, 3.0 ppm. Below 20 ppm threshold Twin Harbors, September 30, 2026, 18.0 ppm. Below 20 ppm threshold Nov 25 Mar 26 Sep 26 Sample date

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Measurement data table
Twin Harbors measurements — 1 year
Sample dateDomoic acid (ppm)Threshold comparison
November 21, 20253.0Below 20 ppm threshold
December 5, 20254.0Below 20 ppm threshold
December 21, 20254.0Below 20 ppm threshold
January 5, 20264.0Below 20 ppm threshold
January 18, 20262.0Below 20 ppm threshold
February 3, 20263.0Below 20 ppm threshold
February 15, 20263.0Below 20 ppm threshold
March 2, 20262.0Below 20 ppm threshold
March 22, 20263.0Below 20 ppm threshold
April 6, 20262.0Below 20 ppm threshold
April 22, 20263.0Below 20 ppm threshold
May 6, 20262.0Below 20 ppm threshold
September 11, 20263.0Below 20 ppm threshold
September 30, 202618.0Below 20 ppm threshold
Copalis

Latest measurement: 9.0 ppm
Sampled

Below 20 ppm threshold

Copalis domoic acid measurements over time ppm 0 5.8 11.5 17.3 23 20 ppm threshold Copalis, February 15, 2026, 2.0 ppm. Below 20 ppm threshold Copalis, March 2, 2026, 1.0 ppm. Below 20 ppm threshold Copalis, March 22, 2026, 1.0 ppm. Below 20 ppm threshold Copalis, April 6, 2026, 1.0 ppm. Below 20 ppm threshold Copalis, April 22, 2026, 1.0 ppm. Below 20 ppm threshold Copalis, May 6, 2026, 1.0 ppm. Below 20 ppm threshold Copalis, May 21, 2026, 0.5 ppm. Below 20 ppm threshold Copalis, June 15, 2026, 0.5 ppm. Below 20 ppm threshold Copalis, June 29, 2026, 0.5 ppm. Below 20 ppm threshold Copalis, July 14, 2026, 0.5 ppm. Below 20 ppm threshold Copalis, August 1, 2026, 0.5 ppm. Below 20 ppm threshold Copalis, August 13, 2026, 0.5 ppm. Below 20 ppm threshold Copalis, August 27, 2026, 1.0 ppm. Below 20 ppm threshold Copalis, September 10, 2026, 2.0 ppm. Below 20 ppm threshold Copalis, September 22, 2026, 4.0 ppm. Below 20 ppm threshold Copalis, September 30, 2026, 5.0 ppm. Below 20 ppm threshold Copalis, October 5, 2026, 9.0 ppm. Below 20 ppm threshold Feb 26 Jun 26 Oct 26 Sample date

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Measurement data table
Copalis measurements — 1 year
Sample dateDomoic acid (ppm)Threshold comparison
February 15, 20262.0Below 20 ppm threshold
March 2, 20261.0Below 20 ppm threshold
March 22, 20261.0Below 20 ppm threshold
April 6, 20261.0Below 20 ppm threshold
April 22, 20261.0Below 20 ppm threshold
May 6, 20261.0Below 20 ppm threshold
May 21, 20260.5Below 20 ppm threshold
June 15, 20260.5Below 20 ppm threshold
June 29, 20260.5Below 20 ppm threshold
July 14, 20260.5Below 20 ppm threshold
August 1, 20260.5Below 20 ppm threshold
August 13, 20260.5Below 20 ppm threshold
August 27, 20261.0Below 20 ppm threshold
September 10, 20262.0Below 20 ppm threshold
September 22, 20264.0Below 20 ppm threshold
September 30, 20265.0Below 20 ppm threshold
October 5, 20269.0Below 20 ppm threshold
Mocrocks

Latest measurement: 8.0 ppm
Sampled

Below 20 ppm threshold

Mocrocks domoic acid measurements over time ppm 0 5.8 11.5 17.3 23 20 ppm threshold Mocrocks, February 15, 2026, 1.0 ppm. Below 20 ppm threshold Mocrocks, March 2, 2026, 1.0 ppm. Below 20 ppm threshold Mocrocks, March 23, 2026, 1.0 ppm. Below 20 ppm threshold Mocrocks, April 6, 2026, 1.0 ppm. Below 20 ppm threshold Mocrocks, April 22, 2026, 1.0 ppm. Below 20 ppm threshold Mocrocks, May 6, 2026, 0.5 ppm. Below 20 ppm threshold Mocrocks, May 21, 2026, 0.5 ppm. Below 20 ppm threshold Mocrocks, June 15, 2026, 0.5 ppm. Below 20 ppm threshold Mocrocks, June 29, 2026, 0.5 ppm. Below 20 ppm threshold Mocrocks, July 14, 2026, 0.5 ppm. Below 20 ppm threshold Mocrocks, August 1, 2026, 0.5 ppm. Below 20 ppm threshold Mocrocks, August 13, 2026, 0.5 ppm. Below 20 ppm threshold Mocrocks, August 27, 2026, 1.0 ppm. Below 20 ppm threshold Mocrocks, September 10, 2026, 2.0 ppm. Below 20 ppm threshold Mocrocks, September 22, 2026, 4.0 ppm. Below 20 ppm threshold Mocrocks, September 30, 2026, 6.0 ppm. Below 20 ppm threshold Mocrocks, October 5, 2026, 8.0 ppm. Below 20 ppm threshold Feb 26 Jun 26 Oct 26 Sample date

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Measurement data table
Mocrocks measurements — 1 year
Sample dateDomoic acid (ppm)Threshold comparison
February 15, 20261.0Below 20 ppm threshold
March 2, 20261.0Below 20 ppm threshold
March 23, 20261.0Below 20 ppm threshold
April 6, 20261.0Below 20 ppm threshold
April 22, 20261.0Below 20 ppm threshold
May 6, 20260.5Below 20 ppm threshold
May 21, 20260.5Below 20 ppm threshold
June 15, 20260.5Below 20 ppm threshold
June 29, 20260.5Below 20 ppm threshold
July 14, 20260.5Below 20 ppm threshold
August 1, 20260.5Below 20 ppm threshold
August 13, 20260.5Below 20 ppm threshold
August 27, 20261.0Below 20 ppm threshold
September 10, 20262.0Below 20 ppm threshold
September 22, 20264.0Below 20 ppm threshold
September 30, 20266.0Below 20 ppm threshold
October 5, 20268.0Below 20 ppm threshold
Kalaloch

Latest measurement: 2.0 ppm
Sampled

Below 20 ppm threshold

This test result is older than 45 days.

No measurements in this time range. Select All to see older samples.

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Measurement data table
Kalaloch measurements — 1 year
Sample dateDomoic acid (ppm)Threshold comparison

Points are actual stored samples. Lines connect samples; they do not represent testing between dates. A reading alone does not indicate that harvesting is approved or a beach is open.

Source: Washington Department of Fish & Wildlife. Samples analyzed by the Washington Department of Health.