August 10, 1916: Municipal Journalarticle. Sterilizing Water and Cleaning Mains. “In connection with the information concerning their water works furnished by more than six hundred officials and published in our June 1st issue, these officials also answered the questions: “Is the capacity of your mains diminished by corrosion?” “Do you clean them?” “If so, how and how often?” “Do you sterilize the water?” “If so, by what process?” Their answers are given in the table on the following pages.
These answers are given as furnished, and no attempt made to change them with a view to uniformity. For instance, some report sterilizing by “liquid chlorine,” others by “chlorine gas,” and some by “chlorine”; but we suppose that all refer to the same treatment. Also “hypochlorite,” “chloride of lime” and “bleach,” all probably refer to the same material.
In the answers concerning cleaning mains, quite a number report doing this by flushing or blowing out. This is generally believed to remove only sediment deposited in the mains, mostly that brought into them by the water, and to have no effect upon tuberculation or corrosion. A few, however, report “cleaning,” which refers in probably all cases to the actual removal by some application of force of tuberculation or other incrustation on the pipes.
It is interesting to note that, of the cities reporting, 96 employ some sterilizing agent, 53 of these using liquid chlorine, which is the latest form of applying chlorine for sterilizing purposes but from these figures appears to have become undoubtedly the most popular. The use of liquid chlorine or hypochlorite is reported from 33 states scattered over the entire country; and it is known that several cities use one or the other which failed to report it, some probably because of local popular prejudice against putting “chemicals” in the water supply.”
Commentary: Disinfection information in this article is fascinating on several levels. First, we see details of which cities were actually disinfecting their water supplies (and those that were not). We also read that there was STILL a fear of chemicals in drinking water even after the overwhelming evidence that typhoid fever and diarrheal diseases could be stopped by such a practice. Finally, this survey documents the conversion from chloride of lime to the use of liquid chlorine that was occurring during this period of water treatment history. Chloride of lime was first used on the Jersey City water supply, which started the disinfection craze (see my book, The Chlorine Revolution). However, the availability of liquid chlorine in pressurized cylinders and the ease of its application ultimately converted everyone to this newer technology.