The nitrate ingested over the course of a person's adult lifetime through the consumption of tap water and bottled water could be a risk factor for prostate cancer, particularly in the case of aggressive tumours and in younger men.
This is the conclusion of a study conducted in Spain and led by the Barcelona Institute for Global Health (ISGlobal), a centre supported by the "la Caixa" Foundation. The study also suggests that diet plays an important role. The researchers found that eating plenty of fibre, fruit/vegetables and vitamin C could reduce the negative effect of nitrate in drinking water.
Link to research paper: https://ehp.niehs.nih.gov/doi/10.1289/EHP11391
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