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Originally Posted by Reiwa [You must be logged in to view images. Log in or Register.]

Death rate doesn't mean infections declined.

https://www.prb.org/resources/clean-...es%20by%201936.

Overall, the researchers calculate that clean water was responsible for about 43 percent of the total mortality decline in the 13 cities from 1900 to 1936 (see table). Infant mortality in cities dropped 62 percent as a result of clean water. On average, water filtration reduced typhoid fever deaths by 46 percent—nearly eradicating that disease in the United States by 1936.