In countries like Thailand and the Philippines, chemicals used in nitrogen fertilizers end up contaminating water systems. “The study shows that drinking water from 30% of all groundwater wells sampled in both countries showed nitrates levels above the World Heath Organization safety limit of 50 mg l-1 of nitrate (NO3-).” This why people in these countries don’t get to drink tap water unless it is boiled for long periods of time. Even by doing this there is no guarantee that the water is really safe for drinking.
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