The phrase "a major source of contamination" is correct and usable in written English.
It can be used when discussing factors that contribute significantly to pollution or contamination in various contexts, such as environmental science, health, or food safety.
Example: "Agricultural runoff is often cited as a major source of contamination in local water supplies."
Alternatives: "a significant contributor to pollution" or "a primary cause of contamination."
Contaminant inputs from wastewater discharge, a major source of contamination to Santa Monica Bay (SMB), have declined drastically during the last three decades as a result of improved treatment processes and better source control.
Trace chemical contaminants generated by human metabolism is a major source of contamination in spacecraft crew module.
Nitrate is a major source of contamination of groundwater in the United States and around the world.
Drill cutting (DC) is a major waste produced during petroleum extraction, which could present a major source of contamination to soil and groundwater, if not disposed properly.
Spots highlighted include the Fox River in Wisconsin, which continues to be a major source of contamination from polychlorinated biphenyls, though the release of PCBs stopped in 1970; the Cuyahoga River; and Presque Isle Bay, where 50 deteriorating hazardous waste drums are buried.
Muscle artifacts are a major source of contamination of scalp EEG data.
A major source of pollution and contamination of groundwater apart from industrial and agricultural activities is leachate from landfills and waste disposal sites, especially if there is little or no monitoring of who dumps what into it, a situation akin to the Abloradjei solid waste disposal site.
Khuzestan's Water and Electricity Company, a state body operating under the energy ministry, has repeatedly announced that pesticides and pollution from sugar cane production are a major source of water contamination.
A fleet of mothballed warships rotting in waters near San Francisco Bay is not a major source of environmental contamination, federal scientists reported.
"Leaking underground storage tanks are a major source of groundwater contamination in the country," said John Senn, a spokesman for the agency in New York City.
Higher δ15N NO3− values and Cl/Br ratios of 300 to 800 in residential areas indicated that waste water and septic effluents were major nitrate sources whereas lower δ15N NO3− values and Cl/Br ratios of 100 to 700 in upland areas suggested that synthetic fertilizers constituted a major source of nitrate contamination of aquifers.
