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Japan want to stop land wastage and underground water pollution.

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Yes, burial affects underground water through the release of leachate, a liquid produced as bodies and caskets decompose. This leachate can contaminate groundwater with pollutants like microorganisms, nitrates, sulfates, and heavy metals, and the risk is greater with a high number of burials in a short time. The impact depends on factors like the soil's properties and the depth of the water table, but it poses a potential health risk to nearby drinking water supplies.

How burials affect groundwater

Leachate production: As bodies and wooden caskets decay, they release a liquid called leachate, which can carry various pollutants.
Pollutant types: This leachate can contain bacteria (like E. coli), viruses, organic matter, nitrates, sulfates, and inorganic ions such as arsenic, copper, and lead.
Contamination pathway: These pollutants can seep into the surrounding soil and travel down into the groundwater, which is a major source of public drinking water.
Factors influencing risk: The degree of contamination is influenced by:
Number and density of burials: A higher number of burials, especially over a short period, increases the concentration of pollutants.
Geological and hydrogeological conditions: The type of soil, its permeability, and the depth of the water table determine how easily contaminants can spread.
Embalming chemicals: The use of chemicals like formaldehyde and arsenic in embalming can contribute to groundwater contamination.

Why it's a concern

Public health risk: Contaminated groundwater can pose a health risk to communities that rely on it for drinking water.
Environmental impact: Pollution can also harm aquatic life and affect the broader ecosystem.
Legal and regulatory implications: Because of these risks, cemeteries are subject to environmental regulations to prevent groundwater pollution