A typical element present in the soil, manganese (Mn), can leach into groundwater. Recently, a study was done to determine the concentrations of this chemical element in California’s Central Valley, which is home to one-third of the state’s domestic well users and is regarded as one of the most productive and economically significant agricultural regions in the country.
Private, untreated well water sources in the Central Valley had the highest manganese concentrations, per this study by UC Riverside. The amounts that the researchers discovered in public water networks were higher than those that had previously been associated with detrimental health effects.
Over 1.3 million Californians may be drinking tap water that contains high amounts of this chemical element
Over 1.3 million Californians may be drinking tap water that contains high amounts of this chemical element, according to the research. According to reports citing the research, the Central Valley of California’s water contains an amount of manganese that is high enough to affect adults’ motor coordination and cognitive function in children, as well as cause Parkinson-like symptoms in children.
According to earlier research, school-aged children who drink water with naturally high manganese concentrations perform worse academically, have poorer focus and memory, and are more likely to develop attention deficit hyperactivity disorder.
Manganese is regulated as a main contaminant in a number of Southeast Asian countries
Despite these studies, the US Environmental Protection Agency (EPA) continues to classify manganese as a secondary pollutant based on adult cohort studies that did not look for neurotoxic endpoints, according to the study paper.
Manganese is regulated as a main contaminant in a number of Southeast Asian countries. However, in terms of control, it is only considered a secondary contaminant in the US. It indicates that there is no predetermined upper limit.
It stated that recent research indicates that a disproportionate number of domestic well-dependent communities in California are underprivileged populations who presumably face financial challenges when testing and treating groundwater. The study observed that a growing body of evidence indicates that manganese concentrations previously regarded as safe may pose serious health risks to vulnerable populations such as children.
“It is a relatively small number of people, compared to the total population of the state, who are getting the tainted water. But for them, the health risks are high,” said Samantha Ying, UCR soil scientist, and principal study investigator. “These people are particularly concentrated in disadvantaged communities, so if they wanted to monitor and treat the water, they would have a hard time doing so,” Ying said.
Water softeners, chlorination, reverse osmosis systems, etc. are some choices for point-of-use treatment. However, the cost of water treatment and the equipment needed to check water quality can both reach $400 annually.
Arsenic has long been regulated as a primary contaminant in the US
“It is possible to purchase filters for manganese, but a lot of people cannot afford them. We are hoping people in these communities can be subsidized to buy treatment options,” Ying said.
Users of community water systems might have access to municipal monitoring and treatment, but domestic goods communities may face significant out-of-pocket expenses, especially for those living below the poverty level, according to the report.
“Using existing groundwater model predictions of manganese concentrations at deeper depths did not change the number of wells likely to be contaminated,” Ying said.
According to the research, secondary contaminant remediation may benefit from changes to legislation governing primary contaminants. According to the research, the implementation of more stringent regulations was associated with a reduction in arsenic concentrations.
Arsenic has long been regulated as a primary contaminant in the US “Wells are labeled unsafe if they contain arsenic, but not if they contain manganese,” Ying said. “Thus, the number of wells considered safe may be greatly overestimated.”
