When the median coliform MPN of water does not exceed 700 per 100 ml, this area is designated as?

The designation of an area as restricted when the median coliform MPN (Most Probable Number) of water does not exceed 700 per 100 ml indicates that while there may be some risk associated with water quality, it is within acceptable limits for certain activities or uses. This means that the water quality is closely monitored and can be used for activities that have some associated risks, such as recreational purposes or certain agricultural uses, provided that specific guidelines or precautions are followed.

The threshold of 700 coliforms per 100 ml serves as an important regulatory measure to protect public health. Water exceeding this level is considered a potential health risk, hence the restriction, as it signifies a level of contamination that warrants concern but is not severe enough to prohibit use entirely. This classification provides a balance between safety and usability, allowing for regulated access to resources while maintaining health safeguards.

In contrast, the other classifications relate to conditions that either represent a complete prohibition or more severe restrictions based on higher levels of contamination, hence not applicable in this scenario with an MPN not exceeding 700.