Our marine waters are a valuable natural asset. They support a huge variety of wildlife and function a lot for humans. We need to protect our marine waters to ensure that they are fit for marine life growth and different human uses in a sustainable manner.

Parameter of Water Test – WCZs

According to Water Quality Objectives (WQOs) for marine waters of Hong Kong, Hong Kong is divided into ten water control zones (WCZs), each of which has a set of WQOs applied. The following parameters are required to be monitored in WCZs.


Aesthetic appearanceDissolved Oxygen
Dissolved Oxygen (bottom)
NutrientsUnionized AmmoniaTotal Inorganic Nitrogen
Total Inorganic NitrogenE. coliSalinity
pHTemperatureSuspended Solids

The marine water test plays a crucial role in ensuring the safety and health of both marine life and humans. The parameters that are tested in the marine water test include pH levels, dissolved oxygen, temperature, salinity, and turbidity. These parameters are crucial in determining the quality of water in different marine zones and the potential risks to aquatic life and human health.

The marine water test is conducted regularly to monitor the water quality in different zones and to ensure that the water meets the set WQOs. It is important to note that water quality can be directly affected by natural and human activities such as pollution, waste disposal, and climate change.

Therefore, regular monitoring and testing are essential to ensure the long-term health and sustainability of our marine waters. By conducting marine water tests, we can identify any issues and take necessary actions to mitigate any harmful impact on the environment and the people who rely on it.

Why CMA Testing

We provide marine water testing in line with WQOs. Our team of experts are equipped with state-of-the-art equipment to measure the qualitative parameters of waterbodies accurately. We take pride in our attention to detail, ensuring that our marine water testing is of the highest quality and meets all necessary standards. Our testing services cover a wide range of applications, from aquaculture to construction projects that may impact marine environments.

We understand the importance of marine water quality and the impact it has on the environment and the community. Our goal is to provide reliable and accurate data to help stakeholders make informed decisions regarding marine water management. By monitoring these parameters regularly, we can identify any changes in water quality and take appropriate actions to maintain the health of our marine ecosystems. Our marine water testing services are essential for protecting the ocean environment and preserving the beauty of Hong Kong’s marine waters for generations to come.