How often are routine bacteria samples collected at a water supply using groundwater sources not influenced by surface water?

Routine bacteria samples at a groundwater source not influenced by surface water are typically collected on a monthly basis. This frequency is established to ensure the consistent monitoring of water quality, enabling the detection of any potential bacterial contamination that could compromise public health. Monthly sampling strikes a balance between thoroughness in monitoring and the practicalities of testing, allowing water operators to respond swiftly to any adverse conditions that may arise.

Sampling weekly may be overly burdensome while not providing significantly more data to improve compliance. Quarterly and yearly sampling intervals would not be adequate for ensuring safe drinking water, as they may miss changes in water quality that occur more frequently. Overall, the monthly sampling schedule supports proactive management of groundwater sources, ensuring the water remains safe for consumption.