DRAFT, needs technical review. Not for publication. The title is our own wording, not the official Paris MoU text.
PSC deficiency code 14402: Sewage treatment plant and discharge arrangements
| Category | MARPOL Annex IV |
| Related certificate | International Sewage Pollution Prevention |
| Main references | MARPOL Annex IV Reg. 9–11 |
| Typical action codes | 17 (rectify before departure), 30 (detainable) if serious |
| Commonly detainable? | Can be, depending on severity (no statistics claimed) |
What PSC officers look for
- Treatment plant not producing compliant effluent
- Chemical dosing or air blower not working
- Discharge in restricted area without comminution
- Placards missing on overboard valves
- Maintenance log not up to date
Typical root causes
- Incorrect chemicals or dosing pump failure
- Plant sized for complement exceeded by extra crew
- Valve lineup wrong after drydock
- Crew treat plant as black box
Corrective action (example)
Repair plant; restore dosing; test effluent sample; verify valve locks and placards; train crew on operation.
Preventive action (example)
Include STP function in environmental rounds; stock chemicals with expiry control.
Evidence to attach for close-out
- Effluent test result
- Maintenance log
- Photo of placards
- Training record
Related
Generate a close-out report for this finding · Download the CAP template
Official code list: Paris MoU, List of Deficiency Codes (1 July 2026). Action codes: Paris MoU, Inspection outcome. Reviewed by: _pending_ · Review date: _pending_ This page is general guidance, not legal, flag or class advice. Always follow the PSC officer's instructions and your flag and class requirements.