H400 — Very toxic to aquatic life
The GHS hazard statement for hazardous to the aquatic environment — acute, category 1. Here is what it means, the label elements that travel with it, and the substances that carry it.
At a glance
| Official statement | Very toxic to aquatic life. |
| Hazard class | Hazardous to the aquatic environment — acute |
| Category | Category 1 |
| Signal word | Warning |
| Pictogram |  GHS09 — Environment |
What it means
Toxic to fish, crustaceans, or algae in short-term exposure. Environmental classes appear on SDSs and labels, but in the US they sit with EPA and DOT rather than OSHA.
When H410 ("Very toxic to aquatic life with long lasting effects") is present, H400 is not stated separately on the label — the stronger statement covers it.
Precautionary statements paired with H400
When the engine writes SDS Section 2 or a container label for a product carrying H400, these are the P-codes it assigns, in the official Annex 3 groups:
Substances that carry H400
1,219 of the 4,225 substances in our database carry H400 when classified in pure form — recognizable examples:
- sodium hypochlorite, solution Cl active — CAS 7681-52-9
- glutaral — CAS 111-30-8
- naphthalene — CAS 91-20-3
- d-limonene — CAS 5989-27-5
The engine writes these for you.
When SDS HQ authors an SDS or a container label, it assigns the hazard statements, signal word, pictograms, and precautionary statements from these same tables — automatically, with the calculation shown.