40 CFR 370.43

How do you convert gallons to pounds for Tier II?

Tier II thresholds and range codes are in pounds, so a product kept in gallons is multiplied by its density. Note 1 to 40 CFR 370.43(a) says to “multiply by an appropriate density factor.” The EPA’s May 2026 instructions write pounds = density (lbs/gal) × gallons, with density = specific gravity × 8.34, and an EPA FAQ lets you estimate a liquid at the density of water when its SDS lists none, for threshold determinations.