Which process helps ensure the quality of the water produced by the treatment system?

Contaminant testing is crucial for ensuring the quality of water produced by a treatment system because it involves analyzing water samples for the presence of harmful substances. This process allows technicians to identify specific contaminants such as bacteria, heavy metals, and chemicals, which can affect the safety and potability of the water. By regularly conducting these tests, technicians can verify that the treatment process is effectively removing contaminants to meet regulatory standards and ensure that the water is safe for consumption.

The other options, while important for various aspects of maintaining a treatment system, do not directly assess the water quality. Pressure leak testing helps identify leaks in the system, flow adjustment focuses on optimizing water flow rates, and system activation refers to the initial turning on of the treatment system. None of these processes directly measure or guarantee the quality of the water produced.