Cannabis Heavy Metal Testing

The detection of heavy metals in cannabis has become increasingly important to protect consumers’ health. There are many potential sources of heavy metal contamination in cannabis, ranging from soil and water contamination to exposure from processing and packaging materials.

Therefore, it’s essential to perform cannabis heavy metal testing to make sure that products are free from harmful substances. At Encore Labs, we use ICP-MS (Inductively Coupled Plasma Mass Spectrometry) to evaluate cannabis.

Our tests may examine different components of the plant, such as the leaves, stems, and flowers, for a comprehensive analysis. Use our cannabis heavy metal testing services soon.

Definition

Heavy metals can be present in cannabis as a result of low-grade pesticides, fertilizers, contaminated water sources, and growing in areas of old industrial sites. Testing for heavy metals in cannabis can not only help identify dangerous product but also sources of contamination within a cultivation and manufacturing process.

Test Benefits

Rigorous cannabis heavy metal testing is a mandatory step for ensuring product safety and meeting strict regulatory standards. Cannabis and hemp plants are bioaccumulators, meaning they can absorb heavy metals like lead, arsenic, cadmium, and mercury from the soil, water, and fertilizers used during cultivation. These toxic elements can then become concentrated in final products, posing a significant health risk to consumers. For cultivators, testing raw plant material provides essential verification that their growing environment is clean and their crops are safe for processing.

Pesticide Limits By State

For manufacturers, comprehensive hemp heavy metal testing and heavy metal testing for THC products are critical quality control checkpoints. This analysis confirms the purity of all inputs and guarantees the final product complies with state-mandated action limits. Failing to detect these contaminants can lead to forced recalls, legal action, and severe damage to a brand’s reputation. By partnering with an accredited lab like Encore Labs, you demonstrate a commitment to consumer safety and product integrity, building trust with regulators and customers.

Category I Residual Pesticides	Action Level (Inhalable) μg/g	Action Level (Non-Inhalable) μg/g
Cadmium	0.2	0.5
Lead	0.5	0.5
Arsenic	0.2	1.5
Mercury	0.1	3

Category I Residual Pesticides

Action Level (Inhalable) μg/g

Action Level (Non-Inhalable) μg/g

Cadmium

0.2

0.5

Lead

0.5

Arsenic

0.2

1.5

Mercury

0.1

Pesticides, Fungicides, Growth Regulators	Allowable Limit (ppm)
Arsenic	0.4 ppm
Cadmium	0.4 ppm
Lead	1 ppm
Mercury	0.2ppm (inhalable); 1.2ppm (Non-Inhalable)

Pesticides, Fungicides, Growth Regulators

Allowable Limit (ppm)

Arsenic

0.4 ppm

Cadmium

0.4 ppm

Lead

1 ppm

Mercury

0.2ppm (inhalable); 1.2ppm (Non-Inhalable)

What We Test For

Regulation

Heavy Metals Testing

The laboratory shall analyze a sample of cannabis flower or cannabis product to determine whether heavy metals like cadmium, lead, arsenic, and mercury are present.
The laboratory shall report the result of the heavy metals test in micrograms per gram (µg/g) on the COA and indicate “pass” or “fail” on the COA.
A sample shall be deemed to have passed the heavy metals testing if the presence of heavy metals does not exceed the action levels defined by the state.