Dr. John L. Leal
May 5, 1858: 162nd anniversary of the birth of John L. Leal, physician and water treatment expert who pioneered chlorine disinfection in the U.S. There are many unsung heroes who contributed significantly to public health at the turn of the 20th century. John L. Leal is one of them and after reading this, I think you will agree that he did more than most to save people’s lives.
John L. Leal was born in the small town of Andes, New York on May 5, 1858. His father, John Rose Leal was a physician who joined the 144th Regiment, New York Volunteers and fought in the Civil War. During the siege of Charleston, South Carolina, John Rose Leal contracted what was most likely a case of amoebic dysentery from contaminated drinking water. He suffered from the disease for more than 17 years before he finally died of it in 1882.
John L. Leal attended Princeton College and graduated in 1880. He went on to Columbia College of Physicians and Surgeons finishing his medical education in 1883. He opened a medical practice in Paterson, New Jersey and went to work for the Paterson Board of Health where he remained until 1899. He left City employment and became the sanitary adviser to private water companies including the East Jersey Water Company and the Jersey City Water Supply Company. In 1888, he married Amy L. Arrowsmith and they had one son, Graham, later that year. So far, his life was well spent but not exemplary.
In the field of water supply, there were big moves afoot in the state of New Jersey at the turn of the 20th century. Jersey City had suffered with a contaminated water supply for decades causing tens of thousands of deaths from typhoid fever and diarrheal diseases. In 1899, the City contracted with Jersey City Water Supply Company to build a dam on the Rockaway River and provide a new water supply. The dam created Boonton Reservoir, which had a storage capacity of over seven billion gallons. Leal’s job with the company was to remove sources of contamination in the Rockaway River watershed above the reservoir. Water from the project was served to the City beginning on May 23, 1904.
When it came time for Jersey City to pay the company for the new water supply, they balked. The price tag was steep—over $175 million in current dollars. Using newly developed bacteriological methods, consultants for the City claimed that the water was not “pure and wholesome,” and they filed suit against the company to get a reduced purchase price. The trial that resulted pitted the water quality experts of the day against one another in a battle of expert witnesses. The opinion of the judge was published on May 1, 1909. In that opinion, Vice Chancellor Frederic W. Stevens said that Boonton Reservoir did a good job on average of reducing the bacteria concentrations in the water provided. However, he noted that two to three times per year, especially after intense rainstorms, the reservoir short-circuited and relatively high bacteria levels resulted.
Rather than build expensive sewers that would deal with only part of the bacteria contamination problem (an early recognition of non-point source pollution) Leal and the company attorney argued to install “other plans or devices” that would do a better job. The judge agreed and gave them a little over three months to prove their idea. Leal had decided in May 1909 that it was time to add a chemical disinfectant to drinking water. He was all too familiar with the suffering and death caused by typhoid fever and diarrheal diseases. He knew of some successful instances of using forms of chlorine in Europe, but nothing had been attempted in the U.S. on a large-scale basis or over any continuous time period.
But, there was a problem. The public feared chemicals in their food, medicines and water. Adulteration of food and medicines was rampant during this period, which was faithfully catalogued in Upton Sinclair’s The Jungle.
“How could they know that the pale-blue milk that they bought around the corner was watered, and doctored with formaldehyde besides?. . .How could they find out that their tea and coffee, their sugar and flour, had been doctored; that their canned peas had been colored with copper salts, and their fruit jams with aniline dyes?”(1)
At any conference of water professionals in the late 19th and early 20th centuries, strong language was used to oppose chemical disinfection. Even George W. Fuller early in his career was not supportive of chemical disinfectants.
1893, George Warren Fuller: “While chemicals have been of much aid in surgery by bringing about antisepsis and asepsis, it is very improbable that people would allow their drinking water to be drugged with chemicals, even with the view of removing dangerous bacteria–indeed, such a method might prove very dangerous in many cases.”(2)
1894, Thomas M. Drown: “…the idea itself of chemical disinfection is repellent.”(3)
1904, George C. Whipple: “Thus in St. Louis the popular prejudice against the use of alum in clarifying the water is said to be so intense that a local engineer has said ‘it is very doubtful if alum could be used, no matter how excellent the results which might be obtained.’. . .‘We don’t want to drink puckered water.’”(4)
1906, George C. Whipple: “The idea of adding poisonous chemicals [like chlorine] to water for the purpose of improving its quality for drinking purposes has generally been considered as illogical and unsafe. . .”(5)
1906, William P. Mason: “I very much question if the public at large would be willing to disinfect water to-day. We are scarcely driven that far yet.”(6)
1906, P.A. Maignen: “Among the so-called ‘disinfectants’ tried may be cited copper, chlorine and oxalic acid. . .Such poisonous materials should not be permitted to be used on water intended for public supplies.”(7)
Nonetheless, Leal was convinced that adding a disinfectant to the Jersey City water supply was the best course. He had done laboratory studies that convinced him that a fraction of a ppm of chlorine would kill disease-causing bacteria. In the face of the certain disapproval of his peers and possible condemnation by the public, he moved forward. Where he found the courage to follow the path of chemical disinfection when all of the experts railed against it is not known for certain. His father’s gruesome illness and death and the unnecessary deaths he personally observed as Health Officer for Paterson must have contributed to his decision.
However, no chlorine feed system treating 40 million gallons per day had ever been designed or built and if the feed system failed to operate reliably, all of the courage of his convictions would not have amounted to much. He needed the best engineer in the country to do the work. He needed George Warren Fuller. In 1908, Fuller was famous for his work in filtration. He had designed an aluminum sulfate feed system treating 30 million gallons per day for the Little Falls treatment plant. On July 19, 1908, Leal left his attorney’s office in Jersey City and took the ferry to Manhattan. In Fuller’s office at 170 Broadway, he hired the famous engineer (undoubtedly on the basis of a handshake) and told him that the bad news was that he needed the work done in a little over three months.
Ninety-nine days later, the chlorine feed system was built and operational. Calcium hypochlorite (known then as chloride of lime or bleaching powder) was made into a concentrated solution, diluted with water and fed through a calibrated orifice to the water before it traveled by gravity to Jersey City. The feed system worked flawlessly from day one and continued to operate successfully for all of the following days. Liquid chlorine eventually replaced chloride of lime, but September 26, 2012, marks the 104th anniversary of the first continuous use of chlorine on a water supply—the longest period of water disinfection anywhere in the world.
In a second trial, the court vindicated Leal’s decision. Afterwards, the use of chlorine spread like wildfire throughout the U.S. Typhoid fever death rates plummeted and children under one year of age stopped dying by the hundreds of thousands.
John L. Leal was not a physically imposing figure. Photographs of him show a man of average height and build with a kind face. Nothing in his appearance hinted at the steel spine and dogged courage that he possessed. One definition of the word hero reads: “a man of distinguished courage or ability, admired for his brave deeds and noble qualities.” These days, many people feel that the word hero has been overused in this country. I think that promoting a water treatment process that saves millions of lives qualifies Leal to be known as a Hero of Public Health.
Why doesn’t everyone know about Leal? Another man, George A. Johnson was wrongly given the credit for the idea of chlorinating the water supply for Jersey City. Johnson was able to get away with his charade, in part, because John L. Leal died on March 13, 1914, and Johnson lived for another 20 years.
Still not convinced? Well, you will have to wait for the full story that has been published in my book, The Chlorine Revolution: Water Disinfection and the Fight to Save Lives which will be available for shipment on March 20, 2013.(8)
(1) Sinclair, Upton. The Jungle: With an Afterword by Emory Elliott. New York:Signet Classic, 1990, original copyright 1905, originally published in 1904.
(2) Fuller, George W. “Sand Filtration of Water, with Special Reference to Results Obtained, at Lawrence, Massachusetts.” In American Public Health Association, Public Health Papers and Reports. Vol. 20, Columbus, OH:APHA, 64-71. 1895.
(3) Drown, Thomas M. “The Electrical Purification of Water.” Journal NEWWA. 8 (1894): 183-7.
(4) Whipple, George C. Discussion of “Purification of Water for Domestic Use.” Transactions ASCE. 54:Part D (1905): 192-206.
(5) Whipple, George C. “Disinfection as a Means of Water Purification.” Proceedings AWWA. (1906): 266-80.
(6) Mason, William P. “Discussion.” Proceedings AWWA. (1906): 282-3.
(7) Maignen, P.A. “Discussion.” Proceedings AWWA. (1906): 285-6.
(8) McGuire, Michael J. The Chlorine Revolution: Water Disinfection and the Fight to Save Lives. Denver, Colorado:American Water Works Association. 2013.
Commentary: On May 5, 2013, at Cedar Lawn Cemetery in Paterson, New Jersey, a grave monument was dedicated to Dr. Leal. For 98 years, his grave was unmarked. The granite obelisk has the names of John L. Leal and five members of his immediate family carved on the sides. Under John L. Leal’s name is the descriptor: Hero of Public Health.
Grave Monument for Dr. Leal