What is the sampling frequency for nitrates in community water systems?

In community water systems, the sampling frequency for nitrates is established to ensure effective monitoring and compliance with health standards. Sampling at least once per year is mandated in order to detect and manage nitrate levels, which can pose significant health risks, particularly for vulnerable populations like infants and pregnant women. This annual requirement enables water systems to assess the safety of their water supply and takes into account seasonal variations that may affect nitrate levels due to agricultural runoff or other sources.

Sampling more frequently, such as every month or every six months, may be adopted in situations where there are emerging concerns or active contaminants, but the regulatory baseline is set at an annual frequency. Additionally, relying solely on contamination reports could lead to delays in identifying potential nitrate issues, compromising the system's response and jeopardizing public health.