What contaminants are monitored with water sampling regulations?

The correct choice focuses on key contaminants required for monitoring in water sampling regulations, which include coliform bacteria, lead, and chlorine residual.

Coliform bacteria are a critical indicator of water quality, particularly in assessing potential fecal contamination. Their presence suggests that harmful pathogens may also be in the water supply, making regular monitoring essential to ensuring public health.

Lead is monitored in drinking water due to its toxic effects on human health, particularly in children. It can leach into drinking water from plumbing fixtures and pipes, especially in older systems. Regulations require testing for lead to maintain safe drinking water standards.

Chlorine residual is monitored as it indicates the effectiveness of disinfection in water treatment processes. Maintaining appropriate levels of chlorine is necessary to prevent the growth of pathogens in the distribution system while ensuring that the water remains safe for consumption.

In contrast, the other options encompass contaminants or parameters that are either not specific to water quality regulations or do not capture the broad range of health-related concerns recognized in drinking water standards. For example, temperature and pressure affect water system operation but do not directly inform about microbiological or chemical contamination levels. Similarly, while solids and dissolved minerals can influence water quality, they do not include the specific health-related contaminants prioritized in regulatory monitoring.