NAICSSector 32
U.S. imports of lime & calcined dolomite (NAICS 327410) totaled $9.6M in July 2026, traded with 26 countries.
Importers of Lime & Calcined Dolomite paid $74K in duties in July 2026 — an effective duty rate of 11% on $704K in dutiable value, based on actual customs collections rather than the published tariff schedule. Lime & Calcined Dolomite imports of $9.6M in July 2026 ran 18% above the year-to-date monthly average of $8.1M.
Last updated: July 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.
1.4K shipments/mo
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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National industry 1 of 1 in naics industry 32741
National industry 327410 · $9.6M of $9.6M
ImportsExports
Imports
$9.6MYoY · Pro
Exports
$6.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
Canada and Mexico together supply 92% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census publishes state breakdowns for NAICS to the 4-digit level only. See NAICS 3274 for those.
entry
Census does not publish port detail for this classification system.