Pesticide classes and residue risks

A classification of the most important substance groups, why lists alone are not sufficient, and how residue reports should be read.

Topic

Substance class plus concentration

Mandatory

Method and panel transparency

Practice

Supplier monitoring

Key points

Residue risks can be understood not only through presence, but through concentration, substance class, and context.
Not every list in the COA is fully meaningful when method and coverage are missing.
Supplier approval without a residue strategy remains blind.

Why residue lists are often read too simplistically

A list with many names looks impressive, but says little when detection limits, methods, and relevant substances remain unclear.

A serious assessment requires more than a green checkmark.

What a clean residue check looks like

Check substance coverage, thresholds, method, batch reference, and test frequency. Only then does data become a safety judgment.

This applies equally whether you rely on a test result from a seller or have your own harvest tested.

Checklist

Document panel coverage
Map thresholds to region
Record residue strategy per supplier

Frequently asked questions

Does not detectable mean safe?

Not automatically. It depends on what was tested and how low the detection limit is.

Why do I need to know the substance class?

Because different substance groups have different toxicological and regulatory relevance.

Sources

→ Full register

1
Fungal Contamination and Safety in Cannabis Products
Applied Microbiology and Biotechnology · 2024
Open ↗
2
Water Activity, Microbial Stability and Shelf-Life Extension
Food Control · 2023
Open ↗
3
Plant Growth Regulators and Pesticide Residues in Cannabis
Journal of Food Protection · 2024
Open ↗
4
Heavy Metal Accumulation in Cannabis and Risk Assessment
Toxicology · 2023
Open ↗
5
Chemical Safety and Risk Communication in Food Supply
European Chemicals Agency (ECHA) · 2024
Open ↗

Safety & Education

Avoiding growth regulators (PGR) and other residues

Why some nutrients and flowering boosters can contain growth regulators, how you avoid them when buying, and what should make you suspicious about your own harvest.

Quality & Lab Values

Reading a COA correctly

This is how you interpret lab reports on potency, terpenes, and contaminants without falling into marketing traps.