U.S. imports of Parts (Including Regulators) for Hydraulic Turbines & Water Wheels (HS 841090) totaled $6.0M in August 2026, imported from 28 countries.
Importers of Parts (Including Regulators) for Hydraulic Turbines & Water Wheels paid $1.4M in duties in August 2026, an average duty rate of 23.88% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataRegulators, runner blades, wicket gates, draft tubes, and other replacement components for hydraulic turbines and water wheels all enter under a single 10-digit line (8410900000), making this heading the primary aftermarket and MRO channel for the US hydropower fleet. Canada leads US imports, consistent with its role as both a major turbine supplier and a country with extensive cross-border hydropower infrastructure. Italy, Slovenia, China, and Spain round out the top supplier group, reflecting a globally distributed spare-parts manufacturing base.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
89 import shipments a month
Governors and speed regulators specifically designed for hydraulic turbines are classified as parts under heading 841090 (8410900000) by virtue of Note 2 to Section XVI, which directs parts principally used with a specific machine to that machine's heading. Generic electronic controllers or programmable logic controllers not dedicated to turbine regulation may instead fall under Chapter 85 or 90 instrument headings, so the design specificity of the component is the key classification factor.
Many turbine components — particularly runner blades and custom-cast parts — are manufactured to original equipment specifications and may have lead times of several months. With suppliers spread across Canada, Europe, and China, importers managing aging hydro installations should maintain safety stock for critical wear parts and consider the impact of any trade-remedy actions on Chinese-origin castings when planning procurement.
Subheading 1 of 4 in heading 8410
Subheading 841090 · $6.0M of $7.1M
ImportsExports
Imports
$6.0MYoY · free account
Exports
$781KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $68.3M of Parts (Including Regulators) for Hydraulic Turbines & Water Wheels and exported $37.7M.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8410900000 | Parts, Inc Regulators, For Hydraulic Turb & Wtr Wh | $6.0M | 23.88% | 73.40% | $1.4M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8410900000 | Parts, Inc Regulators, For Hydraulic Turb & Wtr Wh | $781K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
Canada and Brazil together supply 76% of it. Brazil pays 44.2% duty; Canada 12.2%.
customs district
destination
entry
rate provision · imports
26.6% enters free of duty; duty collected equals 23.88% of imports for consumption.
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