Ballast water testing and compliance

Ships take on ballast water to maintain stability, trim and structural integrity during their operations. When discharged in another location, ballast water can introduce aquatic organisms and pathogens into environments where they are not native.

The International Maritime Organization (IMO) Ballast Water Management Convention (BWM Convention) was adopted to help prevent the spread of potentially harmful aquatic organisms and pathogens through ships' ballast water and sediments. The Convention entered into force internationally on 8 September 2017.

The Convention establishes requirements for ships to manage their ballast water and maintain appropriate documentation, including a Ballast Water Management Plan, Ballast Water Record Book and International Ballast Water Management Certificate.

What is the IMO D-2 ballast water performance standard?

The D-2 standard specifies limits for viable organisms and certain indicator microbes that may be discharged in ballast water.

The implementation schedule established under the BWM Convention required ships to transition to D-2 compliance, with all applicable ships required to meet the D-2 standard by 8 September 2024. In many cases, compliance is achieved using an approved Ballast Water Management System (BWMS) to treat ballast water before discharge.

Testing of treated ballast water can help verify whether a vessel's ballast water discharge meets the applicable biological performance requirements.

Ballast water analysis for IMO D-2 compliance

Eurofins Environment Testing provides laboratory analysis to support ballast water compliance programmes and verification of D-2 performance.

Our biological analysis includes testing for:

Biological analysis and organism monitoring

• Viable organisms >50 µm – zooplankton enumeration (APHA 10200 G)
• Viable organisms 10–50 µm – phytoplankton enumeration (APHA 10200 F)
• Toxigenic Vibrio cholerae (O1 & O139) – qualitative analysis (APHA 9260H)
• Escherichia coli – (APHA 9222 B & G)
• Intestinal enterococci – (USEPA 1600)

These analyses can provide data for assessing treated ballast water and supporting documentation associated with ballast water management and compliance activities.

Ballast water treatment system monitoring

Effective ballast water management depends on the performance of the vessel's Ballast Water Management System (BWMS) and appropriate monitoring of treated discharge.

Laboratory analysis can help vessel operators and other maritime stakeholders assess treatment performance and identify potential issues that may require investigation or corrective action.

Eurofins Environment Testing can support ballast water management programmes with analytical capabilities covering biological and chemical parameters.

VGP ballast water testing

Where applicable, Eurofins Environment Testing also provides testing to support Vessel General Permit (VGP) monitoring requirements.

VGP biological analysis

Available biological testing includes:

• Heterotrophic plate count – APHA 9215B
• Escherichia coli – APHA 9222 B & H
• Enterococci – EPA 1600

VGP chemical analysis

Chemical monitoring for ballast water treatment systems can include:

• Total Residual Oxidisers (TRO) as Cl₂ – SM 4500-Cl G
• Chlorine dioxide – Internal Probe Method
• Chlorite – EPA 300.1
• Chlorate – EPA 300.1
• Total trihalomethanes (THMs) – EPA 8260D
• Haloacetic acids (HAAs) – EPA 552.3

Testing requirements can vary according to the applicable regulatory framework, vessel, treatment technology and monitoring programme. Contact us to discuss the appropriate analytical scope for your application.

Why is ballast water testing important?

Ballast water testing provides laboratory data that can support environmental compliance and ballast water management activities.

For vessel owners and operators, testing can help to:

• Verify treated ballast water against applicable requirements
• Support IMO D-2 compliance programmes
• Monitor the performance of ballast water treatment systems
• Provide analytical evidence for compliance documentation
• Support preparation for inspections and Port State Control activities
• Help identify potential treatment or operational issues
• Reduce the environmental risk associated with the transfer of invasive aquatic organisms

The IMO identifies Port State Control and compliance monitoring as important elements in the effective implementation of the Ballast Water Management Convention.

Ballast Water Record Book and compliance documentation

The Ballast Water Record Book (BWRB) is an important part of ballast water management and records ballast water operations, including uptake, treatment, circulation and discharge.

The IMO adopted amendments to the BWM Convention's Ballast Water Record Book format in 2023, with the revised format entering into force on 1 February 2025.

Laboratory testing can form part of a broader ballast water compliance programme alongside operational records, ship-specific ballast water management procedures and required certification.

Accredited ballast water testing services

Eurofins Environment Testing provides laboratory testing services to support maritime environmental compliance. Our analytical capabilities include recognised APHA, USEPA and other internationally established test methods, depending on the parameter and applicable testing requirements.

As part of the Eurofins global laboratory network, our teams support customers across a broad range of environmental and maritime testing needs.

Why choose Eurofins for ballast water analysis?

• Accredited laboratory testing to applicable recognised methods and requirements
• Specialised environmental testing expertise supporting maritime applications
• Biological and chemical analysis for ballast water treatment and monitoring programmes
• Rapid turnaround options to support time-sensitive vessel operations, where available
• Experienced technical teams able to discuss testing requirements and analytical scope

Who can use our ballast water testing services?

Our ballast water analysis services can support a range of maritime stakeholders, including:

• Ship owners managing environmental compliance across their vessel fleet
• Ship operators and managers monitoring ballast water treatment performance
• Port authorities supporting environmental monitoring and compliance activities
• Ballast Water Management System providers requiring analytical support
• Maritime consultants and technical service providers supporting vessel compliance
• Other maritime organisations requiring biological or chemical ballast water analysis