1. (1) Certified laboratory quality control testing. To become certified, a third-party laboratory must meet the board's certification requirements as described in WAC 314-55-0995 and this chapter before conducting quality control tests required under this section. Cannabis licensees must use a laboratory certified by the board to conduct quality control testing required under this chapter. Prior to becoming certified, laboratories must be accredited by the WSDA as specified in chapter 16-310 WAC.

   1. (a) Licensees must use LCB certified laboratories to conduct testing on cannabis and cannabis products in the following required fields of testing:

      1. (i) Water activity;
      2. (ii) Cannabinoid concentration analysis;
      3. (iii) Foreign matter inspection;
      4. (iv) Microbiological testing;
      5. (v) Mycotoxin testing;
      6. (vi) Pesticide testing; and
      7. (vii) Residual solvent testing.
   2. (b) Certified laboratories may be certified for heavy metal testing and terpene analysis. Certified laboratories must comply with the guidelines for quality control fields of testing described in this chapter and chapter 16-309 WAC if they offer testing services to other certified laboratories.
   3. (c) Certified laboratories may reference samples for testing by subcontracting for fields of testing to other laboratories certified by the LCB.

2. (2) General product quality control testing requirements for certified labs.

   1. (a) Certified laboratories must record an acknowledgment of the receipt of samples from producers or processors. Certified labs must also verify if any unused portion of the sample is destroyed after the completion of required testing.
   2. (b) Certified laboratories must report quality control test results directly to the board in the required format.
   3. (c) Product must not be converted, transferred, or sold by the licensee until the required tests are reported to the board and the licensee.
   4. (d) Certified laboratories must fail a sample if the results for any limit test are above allowable levels regardless of whether the limit test is required in the testing tables in this chapter.
   5. (e) Certified laboratories must test samples on an "as is" or "as received" basis.
   6. (f) For the purposes of this section, certified laboratories are expected to use two significant figures for all test parameters except foreign matter when reporting test results to the board and on associated certificates of analysis.

3. (3) Quality control analysis and testing. The following analysis and testing are only required for samples that have not been previously tested, or that have been authorized by the LCB to retest following failed quality control testing.

   1. (a) Cannabinoid concentration analysis.

      1. (i) A cannabinoid concentration analysis is required to determine the concentration of cannabinoid compounds present in cannabis and cannabis products. The results of the cannabinoid concentration analysis must be reported to the board in the state's traceability system in the required format. The cannabinoid concentration analysis must include testing for at least the following cannabinoids:

         1. (A)

            Cannabinoid	Lower Limit of Quantitation (mg/g)	CAS #
            CBD	1.0	13956-29-1
            CBDA	1.0	1244-58-2
            Δ9-THC	1.0	1972-08-3
            Δ9-THCA	1.0	23978-85-0

         2. (B) Any THC compound that is labeled, advertised, or marketed as part of the product;
         3. (C) Total delta-9 THC;
         4. (D) Total THC for tetrahydrocannabinol compounds other than delta-9 THC;
         5. (E) Total CBD.

      2. (ii) Calculating total THC and total CBD.

         1. (A) Total delta-9 THC must be calculated as follows, where M is the mass or mass fraction of delta-9 THC or delta-9 THCA: M total delta-9 THC = M delta-9 THC + (0.877 × M delta-9 THCA).
         2. (B) Total THC for tetrahydrocannabinol compounds other than delta-9 that are present in an amount greater than 0.2 mg/g must be calculated as follows, where M is the mass or mass fraction of the neutral (THC) or acidic form (THCA) of the tetrahydrocannabinol compound: M total THC = M THC + [(molar mass of THC/molar mass of THCA) × M THCA].
         3. (C) Total CBD must be calculated as follows, where M is the mass or mass fraction of CBD and CBDA: M total CBD = M CBD + (0.877 × M CBDA).
      3. (iii) Regardless of analytical equipment or methodology, certified laboratories must accurately measure and report the acidic (THCA and CBDA) and neutral (THC and CBD) forms of the cannabinoids.

   2. (b) Water activity testing. The sample fails quality control testing for water activity if the results exceed the following limits:

      1. (i) Water activity rate of more than 0.65 a_w for useable cannabis;
      2. (ii) Water activity rate of more than 0.85 a_w for solid edible products.

   3. (c) Foreign matter inspection. The sample fails quality control testing for foreign matter inspection if the results exceed the following limits:

      1. (i) Five percent of stems 3 mm or more in diameter; or
      2. (ii) Two percent of seeds or other foreign matter; or
      3. (iii) One insect fragment, one hair, or one mammalian excreta in sample.

   4. (d) Microbiological testing. The sample and the related population fails quality control testing for microbiological testing if the results exceed the following limits:

      Unprocessed Plant Material	Colony Forming Unit per Gram (CFU/g)
      Bile Tolerant Gram Negative bacteria (BTGN)	10,000
      Shiga toxin-producing Escherichia coli (STEC)	<1
      Salmonella spp.	<1

      Processed Plant Material	Colony Forming Unit per Gram (CFU/g)
      Bile Tolerant Gram Negative bacteria (BTGN)	1,000
      Shiga toxin-producing Escherichia coli (STEC)	<1
      Salmonella spp.	<1

   5. (e) Mycotoxin testing. The sample and the related population fails quality control testing if the results exceed the following limits:

      Mycotoxin	μg/kg	CAS #
      Aflatoxins (Sum of Isomers)	20.
      	• Aflatoxin B1		1162-65-8
      	• Aflatoxin B2		7220-81-7
      	• Aflatoxin G1		1165-39-5
      	• Aflatoxin G2		7241-98-7
      Ochratoxin A	20.	303-47-9

   6. (f) Residual solvent testing. Except as otherwise provided in this subsection, a sample and the related population fails quality control testing for residual solvents if the results exceed the limits provided in the table below. Residual solvent results of more than 5,000 ppm for class three solvents, 50 ppm for class two solvents, and 2 ppm for any class one solvents as defined in United States Pharmacopoeia USP 30 Chemical Tests / <467˃ - Residual Solvents (USP <467˃) not listed in the table below fail quality control testing. When residual solvent testing is required, certified laboratories must test for the solvents listed in the table below at a minimum.

      Solvent	µg/g	CAS #
      Acetone	5000	67-64-1
      Benzene	2.0	71-43-2
      Butanes (Sum of Isomers)	5000
      	• n-butane		106-97-8
      	• 2-methylpropane (isobutane)		75-28-5
      Cyclohexane	3880	110-82-7
      Chloroform	2.0	67-66-3
      Dichloromethane	600	75-09-2
      Ethanol	5000	64-17-5
      Ethyl acetate	5000	141-78-6
      Heptanes (Single Isomer)	5000
      	• n-heptane		142-82-5
      Hexanes (Sum of Isomers)	290
      	• n-hexane		110-54-3
      	• 2-methylpentane		107-83-5
      	• 3-methylpentane		96-14-0
      	• 2,2-dimethylbutane		75-83-2
      	• 2,3-dimethylbutane		79-29-8
      Isopropanol (2-propanol)	5000	67-63-0
      Methanol	3000	67-56-1
      Pentanes (Sum of Isomers)	5000
      	• n-pentane		109-66-0
      	• methylbutane (isopentane)		78-78-4
      	• dimethylpropane (neopentane)		463-82-1
      Propane	5000	74-98-6
      Toluene	890	108-88-3
      Xylenes (Sum of Isomers)	2170
      	• 1,2-dimethylbenzene (ortho-)		95-47-6
      	• 1,3-dimethylbenzene (meta-)		108-38-3
      	• 1,4-dimethylbenzene (para-)		106-42-3

   7. (g) Heavy metal testing. Heavy metal testing is required for all DOH compliant product as described in chapter 246-70 WAC. Heavy metal testing is optional for non-DOH compliant product; however, heavy metal limits provided below apply to all products. Any product exceeding the provided limits is subject to recall and destruction. The board may conduct random or investigation driven heavy metal testing for compliance. A sample and related quantity of product fail quality control testing for heavy metals if the results exceed the limits provided in the table below.

      Metal	μg/g
      Arsenic	2.0
      Cadmium	0.82
      Lead	1.2
      Mercury	0.40

   8. (h) Pesticide testing. For purposes of pesticide testing, a sample and the related quantity of cannabis is considered to have passed if it meets the standards described in WAC 314-55-108 and applicable department of agriculture rules.

4. (4) Required quality control tests. The following quality control tests are required for each of the cannabis products described below. Licensees and certified laboratories may opt to perform optional quality control tests on the same sample.

   1. (a) Cannabis flower. Cannabis flower requires the following quality control tests:

      Product	Test(s) Required
      Cannabis flower	1. Water activity testing2. Cannabinoid concentration analysis3. Foreign matter inspection4. Microbiological testing5. Mycotoxin testing6. Pesticide testing

   2. (b) If cannabis flower will be sold as useable flower, no further testing is required.

   3. (c) Intermediate products. Intermediate products must meet the following requirements related to quality control testing:

      1. (i) All intermediate products must be homogenized prior to quality assurance testing;
      2. (ii) For the purposes of this section, a batch is defined as a single run through the extraction or infusion process;
      3. (iii) Cannabis mix must be chopped or ground so no particles are greater than 3 mm; and

      4. (iv) Intermediate products require the following quality assurance tests:

         Intermediate Product Type	Tests Required
         Cannabis mix	1. Water activity testing2. Cannabinoid concentration analysis3. Foreign matter inspection4. Microbiological testing5. Mycotoxin testing6. Pesticide testing
         Concentrate or extract made with hydrocarbons (solvent based made using n-butane, isobutane, propane, heptane, or other solvents or gases approved by the board of at least 99% purity)	1. Cannabinoid concentration analysis2. Mycotoxin testing3. Residual solvent testing4. Pesticide testing
         Concentrate or extract made with a CO2 extractor like hash oil	1. Cannabinoid concentration analysis2. Mycotoxin testing3. Residual solvent testing4. Pesticide testing
         Concentrate or extract made with ethanol	1. Cannabinoid concentration analysis2. Mycotoxin testing3. Residual solvent testing4. Pesticide testing
         Concentrate or extract made with approved food grade solvent	1. Cannabinoid concentration analysis2. Microbiological testing3. Mycotoxin testing4. Residual solvent testing5. Pesticide testing
         Concentrate or extract (nonsolvent) such as kief, hash, rosin, or bubble hash	1. Cannabinoid concentration analysis2. Microbiological testing3. Mycotoxin testing4. Pesticide testing
         Infused cooking oil or fat in solid form	1. Cannabinoid concentration analysis2. Microbiological testing3. Mycotoxin testing4. Pesticide testing

   4. (d) End products. All cannabis, cannabis-infused products, cannabis concentrates, cannabis mix packaged, and cannabis mix infused sold from a processor to a retailer require the following quality assurance tests:

      End Product Type	Tests Required
      Infused solid edible	1. Cannabinoid concentration analysis2. Water activity testing
      Infused liquid (like a soda or tonic)	1. Cannabinoid concentration analysis
      Infused topical	1. Cannabinoid concentration analysis
      Cannabis mix packaged (loose or rolled)	1. Cannabinoid concentration analysis
      Cannabis mix infused (loose or rolled)	1. Cannabinoid concentration analysis
      Concentrate or cannabis-infused product for inhalation	1. Cannabinoid concentration analysis

   5. (e) End products consisting of only one intermediate product that has not been changed in any way are not subject to cannabinoid concentration analysis.

5. (5) Useable flower, a batch of cannabis concentrate, or a batch of cannabis-infused product may not be sold until the completion and successful passage of required quality control testing, except:

   1. (a) Licensees may wholesale and transfer batches or quantities of cannabis flower and other material that will be extracted, and cannabis mix and nonsolvent extracts, for the purposes of further extraction prior to completing required quality control testing.
   2. (b) Business entities with multiple locations licensed under the same UBI number may transfer cannabis products between the licensed locations under the same UBI number prior to quality control testing.
   3. (c) Licensees may wholesale and transfer failed batches or quantities of cannabis flower to be extracted pursuant to subsection (6) of this section, unless failed for tests that require immediate destruction.

6. (6) Failed test samples.

   1. (a) Upon approval by the board, failed quantities of cannabis or batches may be used to create extracts. After processing, the extract must pass all quality control tests required in this section before it may be sold, unless failed for heavy metal or pesticide tests that require immediate destruction.
   2. (b) Retesting. A producer or processor must request retesting. The board may authorize the retest to validate a failed test result on a case-by-case basis. The producer or the processor requesting the retest must pay for the cost of all retesting.

   3. (c) Remediation. Remediation is a process or technique applied to quantities of cannabis flower, lots, or batches. Remediation may occur after the first failure, depending on the failure, or if a retest process results in a second failure. Pesticide failures may not be remediated.

      1. (i) Producers and processors may remediate failed cannabis flower, lots, or batches so long as the remediation method does not impart any toxic or harmful substance to the useable cannabis, cannabis concentrates, or cannabis-infused product. Remediation solvents or methods used on the cannabis product must be disclosed to:

         1. (A) A licensed processor;
         2. (B) The producer or producer/processor who transfers the cannabis products;
         3. (C) A licensed retailer carrying cannabis products derived from the remediated cannabis flower, lot, or batch; or
         4. (D) The consumer upon request.
      2. (ii) The entire quantity of cannabis from which the failed sample(s) were deducted must be remediated.
      3. (iii) No remediated quantity of cannabis may be sold or transported until quality control testing consistent with the requirements of this section is completed.
      4. (iv) If a failed quantity of remediated cannabis is not remediated or reprocessed in any way after a first failure, it cannot be retested. Any subsequent certificates of analysis produced without remediation or reprocessing of the failed quantity of cannabis will not supersede the original compliance testing certificate of analysis.

7. (7) Referencing. Certified laboratories may reference samples for testing to other certified laboratories by subcontracting for fields of testing. Laboratories may not reference samples for conducting retesting of samples for fields of testing they have already analyzed.

   1. (a) Laboratories must record all referencing to other laboratories on a chain-of-custody manifest that includes, but is not limited to, the following information: Laboratory name, certification number, transfer date, address, contact information, delivery personnel, sample ID numbers, field of testing, and receiving personnel.
   2. (b) All test results (fields of testing) that were subcontracted to other certified laboratories must be clearly indicated on the certificate of analysis including the name, address, and certification number of the laboratory that tested the sample.
8. (8) Certified laboratories are not limited in the amount of useable cannabis and cannabis products they may have on their premises at any given time, but a certified laboratory must have records proving all cannabis and cannabis-infused products in the certified laboratory's possession are held only for the testing purposes described in this chapter.
9. (9) A certificate of analysis issued by a certified laboratory for any cannabis product subject to the requirements of this chapter and chapter 246-70 WAC that has not already been transferred to a retail location expires 12 calendar months after issuance.
10. (10) The board, or its designee, may request that a licensee or a certified laboratory provide an employee of the board or their designee samples of cannabis or cannabis products, or samples of the growing medium, soil amendments, fertilizers, crop production aids, pesticides, or water for random or investigatory compliance checks. Samples may be randomly screened and used for other quality control tests deemed necessary by the board.

11. (11) All cannabis products produced, processed, distributed, or sold after the effective date of these rules, must comply with these rules and this chapter.

    Reviser's note: The brackets and enclosed material in the text of the above section occurred in the copy filed by the agency.

[Statutory Authority: RCW 69.50.342, 69.50.345, and 69.50.348. WSR 25-09-167, s 314-55-102, filed 4/23/25, effective 5/24/25. Statutory Authority: RCW 69.50.342 and 69.50.345. WSR 24-21-051, s 314-55-102, filed 10/9/24, effective 1/7/25. Statutory Authority: RCW 69.50.342 and 2022 c 16 § 168. WSR 22-14-111, § 314-55-102, filed 7/6/22, effective 8/6/22. Statutory Authority: RCW 69.50.345 and 69.50.348. WSR 22-06-097, § 314-55-102, filed 3/2/22, effective 4/2/22. Statutory Authority: RCW 69.50.342 and 69.50.345. WSR 17-12-032, § 314-55-102, filed 5/31/17, effective 8/31/17; WSR 16-11-110, § 314-55-102, filed 5/18/16, effective 6/18/16; WSR 15-11-107, § 314-55-102, filed 5/20/15, effective 6/20/15; WSR 14-07-116, § 314-55-102, filed 3/19/14, effective 4/19/14. Statutory Authority: RCW 69.50.325, 69.50.331, 69.50.342, 69.50.345. WSR 13-21-104, § 314-55-102, filed 10/21/13, effective 11/21/13.]