How often must turbidity readings be recorded for systems serving more than 10,000 people?

For systems serving more than 10,000 people, turbidity readings must be recorded every 15 minutes. This frequency is mandated to ensure that water quality is consistently monitored, as turbidity can indicate the presence of pathogens or other contaminants in the water supply. Frequent monitoring allows for timely detection of any changes in water quality, which is crucial for maintaining public health and safety.

Recording turbidity at this interval helps operators to respond quickly to potential issues, thereby ensuring compliance with regulatory standards and safeguarding the drinking water supplied to a large population. Systems serving fewer people may have different monitoring requirements, reflecting the varying levels of risk associated with smaller water systems.