Although much of the water in the world “is not usable for agriculture, industry, or human consumption” (39), people have managed to pollute or otherwise deplete the small percentage of water in the world that is available for their use. Thus water has become “the victim of [people’s] indifference” (39). Carson argues that it is only possible to understand the “problem of water pollution by pesticides” (39) in relation to the larger pollution of the environment. The pollution in water comes from pollution in all other areas of the earth, as well as from direct application of chemicals to water itself. The “deluge of chemical pollution” (40) in American waterways is so large that it is difficult to detect them and even harder to get them out of the water.

Carson articulates that one of the greatest threats to waterways is “the widespread contamination of groundwater” (42), which travels in between the water that is visible to humans. Nature, Carson reminds us, does not “operate in closed and separate compartments,” so “pollution of the groundwater is pollution of water everywhere” (42).

Water also poses a greater danger in regards to pollution because it allows for the mixing of multiple chemicals which may have been harmless on their own.