40 CFR § 436.140 - Applicability; description of the potash subcategory.

---
identifier: "/us/cfr/t40/s436.140"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 436.140 - Applicability; description of the potash subcategory."
title_number: 40
title_name: "Protection of Environment"
section_number: "436.140"
section_name: "Applicability; description of the potash subcategory."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "N"
subchapter_name: "EFFLUENT GUIDELINES AND STANDARDS"
part_number: "436"
part_name: "MINERAL MINING AND PROCESSING POINT SOURCE CATEGORY"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Secs. 301, 304 (b) and (c), Federal Water Pollution Control Act, as amended (33 U.S.C. 1251, 1311, 1314 (b) and (c), 86 Stat. 816  Pub. L. 92-500) (the Act)."
regulatory_source: "40 FR 48657, Oct. 16, 1975, unless otherwise noted."
cfr_part: "436"
---


# 436.140 Applicability; description of the potash subcategory.

The provisions of this subpart are applicable to the processing of potash. Potash obtained from brine lakes is regulated in the saline from brine lakes subcategory (subpart L of this part).