What is Scrubber Exhaust Washwater Testing?

To comply with the IMO’S 2020 Sulphur Cap, scrubbers are being used frequently to remove contaminants from a vessels’ exhausts by spraying a buffer solution (usually seawater) over exhaust gases. A byproduct of these Exhaust Gas Cleaning Systems (EGCS) or scrubbers, is a lot of exhaust Washwater which is discharged overboard. That washwater needs to be tested annually: it can be much more acidic than the surrounding seawater and contains polycyclic aromatic hydrocarbons, particulate matter, nitrates, nitrites, and heavy metals including nickel, lead, copper, and mercury.

Therefore, releasing this water may have toxic impacts on marine life. For this reason, several countries require you to collect this washwater and have it analyzed in a laboratory.

You can book your Scrubber Exhaust Washwater Test now to keep your fleet compliant and be able to present all documents to Port State Authorities.

How you'll benefit from working with us for your MEPC Scrubber Washwater

Compliance assured

You can be sure that our service is always compliant.

Scrubber regulations are complex. Our services are designed for compliance with VGP2013, MEPC.259(68) and 340(77) as well as your crew’s convenience.

Reliable and honest

Expect no surprises afterwards.

We do not deal in small-print. Our rates are fixed worldwide and our offering is all-inclusive – budgetable and transparent.

Clients' interest first

Your service preference as our valued client comes first.

No ship or crew is the same. We offer bespoke types of Scrubber Washwater Testing solutions, for different service requirements.

Why you need Scrubber Exhaust Washwater Testing?

Scrubber Exhaust Washwater testing is mandatory prior to calling ports Australian waters (AMSA Marine Notice 5/2019 and 5/2022). In addition, as of June 2022 the IMO MEPC.340(77) regulations apply that require sampling once per year. VGP 2013 also includes testing of Scrubber Washwater water that is discharged.

Scrubber Exhaust Washwater regulations are complex, fragmented and difficult in practice. Many ports or countries restrict the use of scrubbers in their waters, making underway sampling activities complex and potentially risky for ship crews. Moreover, Scrubber Exhaust Washwater testing has to meet specific requirements for you: it should leave full operational flexibility for your crews and vessels.

Still have questions whether or not Scrubber Exhaust Washwater Testing is required for your vessel? Or wonder how to get it done?

Control room, planning, helpdesk, support, expert teams, add-on

Control Room: Always on time

Our Control Room saves time and makes being compliant easy. Your vessels’ crews (Master) and shore staff (superintendent) will receive our notification when your vessel:

    1. Requires Water Compliance Testing as per your requirements, and
    2. Calls a port where you can be serviced.


You define your regulatory strategy. We make sure you are on time and help you plan your compliance.

How to get Scrubber Exhaust Washwater Testing now

That’s simple: reach out to our team of expert now. You can secure your Scrubber Exhaust Washwater Tests using our specially developed Sampling Kits. Simply send us an e-mail, whatsapp or call our team. We are happy to explain you the different service options! Even when you’re in a hurry, we can assist.

VPC, trusted all over the world

We are Control Union Vessel Performance Centre B.V. (VPC). We are part of Royal Peterson and Control Union. Our VPC offers vessel compliance and performance solutions to shipping. We deliver our services globally under a single quality system, through our network of Control Union offices. Our central team of experts is your single point of contact for our global services.

Our Scrubber Exhaust Washwater Testing solutions have been tried and tested with leading shipowners. Supported by our in-house network of ISO 17025-accredited laboratories and building on more than hundred years of shipping experience, our solution is practical, safe and delivers real compliance. What more do you need?

More about VPC or Peterson and Control Union?

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MEPC Scrubber Washwater Testing

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VPC Expertise Centre

Want to know more about the Scrubber Exhaust Washwater testing service? Download our Whitepaper now!

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Class Approvals

Control Union Vessel Performance Centre B.V. holds the “Approved subcontractor”- status from leading Class societies. Click the logo to see the certificate.

Control Union Certifications is a US Coast Guard-accepted Independent Laboratory (IL) for testing of BWMS in accordance with 46 CFR 162.060.

GHG Emissions Regulations

The EU requires Monitoring, Reporting and Verification (EU-MRV) for ships over 5,000 GT (and over 400 GT from 1 January 2025) calling European ports regardless of their Flag, as per EU Regulation 2015/757 and amending Regulation (EU)2023/957. Only Accredited Verifiers independent from the entity providing Monitoring and Reporting, can sign-off on Emissions Reports to be reported in Thetis-EU and included in each ships’ Document of Compliance (DoC).

IMODCS and China-DCS
In  2019 the IMO Data Collection System (IMODCS) became obligatory for vessels above 5,000 GT, to collect fuel use, emissions and ship service information per each vessel’s approved SEEMP II. This regulation is based on MARPOL Annex VI . Recognized Organizations (RO) like Class Societies verify IMODCS reports. The Chinese Maritime Safety Administration started its Data Collection on Energy Consumption (China-DCS): similar but different Emission reporting from any vessel calling specific Chinese ports per regulation from the MSA China Maritime Safety Administration in 2018 (contact us for your copy).

The Carbon Intensity Indicator (CII)  is a system for ships to gradually reduce emissions, that the IMO developed as a mandatory measure under MARPOL Annex VI since 1 January 2023. At that time IMO also implemented its Energy Efficiency Existing Ship Index (EEXI) to rate energy-efficiency of different vessels, which is included in each vessel’s International Air Pollution Prevention (IAPP) Survey by Class.

From 1 January 2023, ships of 5,000 GT and above must have a verified Ship Energy Efficiency Management Plan (SEEMP Part III) on board to document how their vessel plans to achieve its CII-targets.

Since  2022, all vessels that are subjected to EU-MRV have to collect data and report emissions per UK-MRV also, for their port calls in the United Kingdom. This is laid down in regulation MIN 669 (M+F) which is likely to be amended in the future.  Verifiers must be UKAS-accredited.

EU-ETS and EUA’s
From 1 January 2024 onwards the EU taxes Emissions from ships through its “cap-and-trade” European Trading System (EU-ETS). Directive (EU) 2023/959 requires vessel owners (or their mandated ISM Company) to purchase and surrender EU Allowances (EUA’s) matching their Emissions that are beyond their yearly allowance.

FuelEU Maritime
As of 2025, the EU is expected to launch its “book-and-claim” FuelEU Maritime Regulation (EU) 2023/1805 which promotes the use of renewable, low-carbon fuels and clean energy technologies for ships – from fuel production wells to ships’ wakes. Fleets of ships should actively lower their GHG intensity of fuels, by 2% in 2025 to 80% in 2050 or pay steep penalties otherwise.