The International Maritime Organization has increased its focus on Ballast Water Treatment System (BWTS) operation in 2026.
Most ships already have an approved BWTS installed.
What has changed is how inspections are carried out.
Operation is now a key inspection point
In 2026, inspectors focus more on real BWTS operation, not only certificates.
During inspections, crews may be asked to:
- Start and stop the BWTS
- Change operating modes
- Show alarms and logs
- Explain basic system operation
This applies during Port State Control and flag inspections.
Common BWTS issues seen onboard
Many BWTS systems are installed correctly but face problems in daily use.
Common findings include:
- High filter differential pressure
- Low UV intensity
- Incorrect sensor readings
- Valve or actuator faults
These issues can cause alarms, reduced flow, or inspection remarks.
Maintenance and records matter
Inspectors increasingly check:
- Maintenance records
- Sensor calibration
- Alarm history
- Recent operating data
Clear records help show that the BWTS is working correctly and maintained as required.
What this means for ship operators
BWTS compliance now depends on:
- Correct operation
- Regular maintenance
- Accurate sensors
- Crew familiarity
- Clear documentation
Good preparation reduces inspection risk and delays.
Why Nordast
Nordast supports BWTS compliance with practical onboard service.
We provide:
- Commissioning and re-commissioning
- Operational testing during ballast and deballast
- Filter, valve, and UV system service
- Sensor checks and calibration support
- Genuine/OEM spare parts
- Clear service reports for inspections
Our teams support vessels worldwide with real operational readiness, not paperwork only.
