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.
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 for a product carrying H400, these are the precautionary statements it assigns, with combined statements written as one line:
Reference information, not legal or professional advice. Statement texts and allocations follow 29 CFR 1910.1200 Appendix C (the GHS as adopted by OSHA HazCom 2024) as implemented by our classification engine; the regulatory text and agency practice control. Claims last reviewed July 23, 2026.
The engine writes these for you.
When SDS HQ authors an SDS, it assigns the hazard statements, signal word, pictograms, and precautionary statements from these same tables — automatically, with the calculation shown.