Even a Distant Water Source Could Be Contaminated
At the beginning of the twentieth century, Jersey City residents relied on piped drinking water. The system moved its source to Boonton Reservoir on the Rockaway River and began supplying water in 1904. Water traveled through tunnels, concrete conduits, and steel pipes to the city roughly twenty-three miles away. Heavy rain and flooding could nevertheless wash contaminants from the watershed into the reservoir. Water that appeared sound under ordinary conditions might show substantial bacterial contamination within days.
Waterborne typhoid made these fluctuations a matter of life and death. The city government and the Jersey City Water Supply Company litigated their contract, disputing whether the company had delivered water fit for drinking and domestic use. Proceedings in 1908 required the company to address poor quality during the few heavily contaminated periods each year. Building watershed sewage facilities, adding filtration, or using another treatment each raised questions of construction costs, schedules, and contractual responsibility.
A Physician Proposes Treatment and Engineers Arrange Continuous Dosing
Water-supply sanitary adviser John Leal had experimented with chlorine disinfection. Believing that sewage facilities alone could not exclude all bacteria washed in by rain, he advocated treatment before the water reached the city. Once the court allowed the company to propose an alternative, he first sought suitable brine-electrolysis equipment. Unable to obtain it in time, he recommended bleaching powder, then called chloride of lime.
Chlorine compounds had already been used in European water-supply experiments and epidemic responses. Leal sought to turn disinfection into a daily public-water-supply process. George Warren Fuller's firm, Hering and Fuller, undertook the design, linking dissolution, mixing, conveyance, and metering; George Johnson handled early operation and testing. The water company supplied the facilities and organization, while engineers, operators, and laboratories jointly put the physician's judgment into practice.
September 26, 1908: The Plant Joins the Water Supply
Continuous disinfection at Boonton began on September 26, 1908. A single-story wooden building near the foot of the dam housed solution tanks, pumps, and a small laboratory. Workers dissolved and diluted bleaching powder, and pumps raised the solution before it flowed by gravity through a metering device into the conduit entrance, mixing with water bound for Jersey City. The water flow and solution strength had to be matched to maintain consistent treatment as the flow changed.
Fuller incorporated backup equipment into the design: pumps and metering devices could be switched over, while float-operated alarms warned operators of falling solution levels. Agitators in the dissolving tanks kept the solution uniform, and floats drove recorders that tracked changes in level. Operators could also observe levels through glass tubes; readings and alarms together helped identify abnormalities. Laboratory checks guided operational adjustments. The plant treated a city's daily supply of about forty million US gallons, requiring staff on successive shifts to prepare solutions, take readings, and inspect equipment. Disinfection had moved from a laboratory water sample to urban infrastructure demanding continuous maintenance.
Water Samples Enter the Laboratory and the Courtroom
Once the plant began operating, water-quality evidence became the focus of dispute. Johnson's report compared raw reservoir water, treated water, and samples at Jersey City's delivery point, with laboratories in Boonton, Jersey City, and New York participating. Tests included general bacterial counts and the colon bacillus, then used as an indicator of contamination. The results showed a marked decline in bacteria in treated water. Monitoring covered transmission from reservoir to city delivery point, allowing engineers to demonstrate effectiveness and opponents to scrutinize sampling, analysis, and equipment reliability. Continuously accumulating test results began to answer whether the supply contract was being fulfilled.
In 1909, Leal, Fuller, and Johnson separately presented the decision-making process, plant design, and operating results to the American Water Works Association. The discussions brought a local contractual dispute into the national water-supply profession. On May 9, 1910, court-appointed special master William Magie submitted a report finding that the treatment could bring delivered water into compliance with the contract. Acceptance of the new method rested on a combination of sustained operation, test data, expert testimony, and judicial scrutiny.
Placing Disease Prevention Upstream of the Tap
Jersey City became a key early case of continuous chlorination in American public water supply. Small chemical requirements and equipment that could connect to existing systems showed other cities a practicable treatment route. Instead of residents waiting for an outbreak and responding household by household, water authorities could continually reduce opportunities for bacterial transmission before water entered thousands of homes. Equipment, staff, and routine testing thus became part of disease prevention.
Chlorination subsequently developed alongside filtration, watershed protection, and sewage facilities, helping reduce urban waterborne-disease risks. Leal's 1909 report also identified use alongside filtration as an important application. Boonton's lesson was how to organize a known chemical action into a repeatable, inspectable, and accountable service: physicians proposed a method, engineers made it operate reliably, laboratories supplied evidence, and public institutions examined the water company's promises to residents.