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NAICSSector 32
U.S. imports of lime & calcined dolomite (NAICS 327410) totaled $7.6M in April 2026, traded with 22 countries.
Importers of Lime & Calcined Dolomite paid $75K in duties in April 2026 — an effective duty rate of 9.4% on $800K in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataAt the six-digit NAICS level, NAICS 327410 captures establishments manufacturing quicklime, hydrated lime, and calcined dolomite from limestone or dolomite rock through high-temperature kiln processes. The steel industry is the largest single end-use market for lime, consuming it as a flux to remove impurities during smelting, while environmental applications—including flue-gas desulfurization and acid mine drainage treatment—represent a growing demand segment. Import competitiveness is closely tied to proximity to limestone quarries and kiln energy costs, making Canada a natural cross-border supplier for northern US markets.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
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.
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No geographic breakdown available
U.S. trade for this product is not broken down by state or port in the latest Census Bureau release.
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $4.4M | $5.6M | +$1.1M |
| MEXICO | $2.3M | $320K | -$2.0M |
| DOMINICAN REPUBLIC | $130K | -- | -$130K |
| UNITED KINGDOM | $127K | -- | -$127K |
| FRANCE | $98K | -- | -$98K |
Monthly import values over time