40 CFR § 139.12 - Boilers.

---
identifier: "/us/cfr/t40/s139.12"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 139.12 - Boilers."
title_number: 40
title_name: "Protection of Environment"
section_number: "139.12"
section_name: "Boilers."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "D"
subchapter_name: "WATER PROGRAMS"
part_number: "139"
part_name: "DISCHARGES INCIDENTAL TO THE NORMAL OPERATION OF VESSELS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1251"
regulatory_source: "89 FR 82131, Oct. 9, 2024, unless otherwise noted."
cfr_part: "139"
---


# 139.12 Boilers.

(a) The requirements in paragraphs (b) and (c) of this section apply to discharges resulting from boiler blowdown.

(b) The discharge from boiler blowdown must be minimized in port.

(c) Additional standards applicable to discharges from boilers when a vessel is operating in federally-protected waters are contained in § 139.40(d).