Canada has extensive high-purity limestone deposits and established kiln capacity in provinces close to major US industrial centers. Cross-border shipments benefit from USMCA trade terms and short overland transit distances, which are particularly advantageous for a heavy, moisture-sensitive commodity where freight cost and delivery speed matter. This geographic and trade-agreement advantage makes Canadian lime highly competitive in northern and midwestern US markets.

Stricter air-quality and water-treatment regulations—including EPA rules on mercury emissions from power plants and effluent limits for industrial discharges—have expanded demand for lime in flue-gas desulfurization and wastewater neutralization applications. Importers supplying environmental end-users should be prepared to document lime reactivity and purity to meet permit-driven specifications.