Wastewater that accumulates in the lower compartments of vessels — especially in the engine room — is known as bilge water. This fluid results from various onboard operations carried out to keep the ship’s systems functioning properly.

Bilge water is stored in the bilge tank and contains a complex mixture of substances, including:

• Lubricating and hydraulic oils
• Sewage water, greywater, and scrubber water
• Combustion residues, dust, and soot
• Fluids from drainage systems, sludge tanks, and machinery spaces
• Various chemicals

Due to its potentially polluting composition, the effluent from the Oily Water Separator (OWS) must be periodically analyzed to ensure that oil and grease levels comply with environmental standards, such as the Vessel General Permit (VGP).

Conducting Bilge Water Testing is essential for companies in the maritime and offshore sectors. In addition to ensuring compliance with international environmental regulations, this service protects shipowners from severe penalties, such as million-dollar fines and legal sanctions resulting from leaks or improper discharges.