Monopotassium phosphite

CAS 13977-65-6

Used in 1 industrial sector tracked by the EPA.

Molecular structure of 13977-65-6 — 1 K⁺

US production1.5M lb

Import value, 2024$19M

Import volume187.0K lb

Import dependency11%

Top sourceChina 86%

Production is reported production, not a complete census of factories. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 283510 · basket

EPA reports by year

2023: US production 1.5M lb · Imports 187.0K lb
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 283510, which covers 15 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CN 86%ChinaCH 6%SwitzerlandIN 4%IndiaGB 3%United KingdomDE 1%Germany

Denmark
Canada
Mexico
Turkey
Italy

EPA-registered manufacturers (3)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Nutrien · CA Canada

Nutien Us Top

Wilbur-Ellis Holdings Ii

Domestic parents -- activity not disclosed (2)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Miles Chemical

Valudor Products

EPA-registered importers (1)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Haifa North America

Why It Matters

Sectors

Agriculture

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

•Soil amendments (fertilizers) in Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS13977-65-6

PubChem CID23707081

DTXSIDDTXSID20884521

FormulaHKO3P+

Mol. Weight119.078 g/mol

SMILESO[P+](=O)[O-].[K+]

Data Sources

EPA CompTox (DSSTox) · DTXSID20884521Retrieved 2026-04-06
PubChem · compound 23707081Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Monopotassium phosphite (CAS 13977-65-6) https://chemicalindependence.com/chemical/13977-65-6/ EPA CompTox (DSSTox): DTXSID20884521. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID20884521 PubChem: 23707081. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/23707081 EPA Chemical Data Reporting: 13977-65-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 13977-65-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 283510 for CAS 13977-65-6. Reporting year: 2024. https://usatrade.census.gov/