What represents a level of fecal coliform contamination that requires attention?

The presence of fecal coliform bacteria in water is a significant indicator of water quality and potential contamination by fecal matter, which can pose health risks to humans and the environment. Levels above 5,000 colonies per 100 ml indicate a serious level of contamination and signify that the water is likely unsafe for recreational use or consumption. This elevated level warrants immediate attention and corrective actions, such as further testing, identifying the source of contamination, and remediation efforts to protect public health.

Lower levels, such as those below 1,000 colonies per 100 ml or within the range of 1,000 to 5,000 colonies per 100 ml, may still require monitoring and may raise concerns, but do not present the same urgent risk as levels exceeding 5,000 colonies per 100 ml. The absence of fecal coliform, while ideal, does not represent a level of contamination that calls for attention, as it indicates that the water is likely safe and free from fecal contamination.