---
kind: "section"
citation: "40 C.F.R. § 139.28"
title: "40"
number: "139.28"
heading: "Seawater piping."
url: "https://uscodex.org/cfr/40/139.28"
---

# §139.28. Seawater piping.

- (a) The requirements in [paragraphs (b) through (d)](#b..d) of this section apply to discharges from seawater piping systems, including while a vessel is in port or in layup.
- (b) Seawater piping systems must be inspected, maintained, and cleaned as necessary to minimize the accumulation and discharge of biofouling organisms.
- (c) Seawater piping systems that accumulate macrofouling must be fitted with a Marine Growth Prevention System (MGPS).
  - (1) An MGPS must be selected to address:
    - (i) The level, frequency, and type of expected biofouling; and
    - (ii) The design, location, and area in which the system will be used.
  - (2) An MGPS must include one, or some combination of the following:
    - (i) Chemical injection;
    - (ii) Electrolysis, ultrasound, ultraviolet radiation, or electrochlorination;
    - (iii) Application of an antifouling coating;
    - (iv) Use of cupro-nickel piping; or
    - (v) **Use of glass-reinforced/filament-wound epoxy-based composite piping.**
  - (3) Upon identification of macrofouling in a seawater piping system, reactive measures to manage the macrofouling must be used. Discharges resulting from reactive measures to remove macrofouling are prohibited in port.
- (d) Additional standards applicable to discharges from seawater piping systems when a vessel is operating in federally-protected waters are contained in [§ 139.40(l)](/cfr/40/139.40.md?p=l).

## Notes

### Authority

Authority: 33 U.S.C. 1251 et seq.

### Source

Source: 89 FR 82131, Oct. 9, 2024, unless otherwise noted.