40 CFR § 139.29 - Sonar domes.

---
identifier: "/us/cfr/t40/s139.29"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 139.29 - Sonar domes."
title_number: 40
title_name: "Protection of Environment"
section_number: "139.29"
section_name: "Sonar domes."
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: "2026-04-05"
last_updated: "2026-04-05"
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"
---


# 139.29 Sonar domes.

(a) The requirements in paragraphs (b) and (c) of this section apply to discharges from sonar domes.

(b) The discharge of water from inside the sonar dome is prohibited during maintenance or repair.

(c) Any discharge from the use of bioaccumulative biocides on the exterior of the sonar dome is prohibited when non-bioaccumulative alternatives are available.