How have others handled EPA-exempt products that aren't found on the SF list? It seems you can't rely on the label of the product to determine if it has any of the hazards that would indicate Tier 1, 2, or 3 like you would other products that aren't listed on the SF list. For instance: http://www.envincio.com/essentria/product-dload/Essentria_IC3_label.pdf ?
With the discussion below indicating that DE and pyrethrins aren't Tier 3, it is clear you can't make any assumptions.