How many consecutive days must a BacT sample show negative results?

For a BacT (bacteriological) sample to be considered negative and to ensure water safety, it generally must show negative results for three consecutive days. This is a standard practice in water management to confirm that no contamination is present, as short-term anomalies can occasionally occur. Monitoring for three consecutive days provides a more reliable assessment of water quality, ensuring that temporary spikes in bacteria levels do not lead to false conclusions about water safety. By demonstrating consistent negative results over this period, operators can confirm that the water is clear from harmful bacteria and safe for public consumption.