Permissible level of nitrate ions in the drinking water is

Excess of nitrate ions in drinking water causes.

Maximum permissible limit of nitrate in drinking water is

The maximum allowable level of Nitrates in drinking water as set by U.S. is 45 mg NO_(3)^(-) ions per dm^(3) , the level in ppm is

Tolerable limit for nitrate ion for drinking water is

Accoridng to EPA guidelines the permissible level for lead in drinking water is 15 parts per billion (ppb). What is the maximum allowable mass of lead that could be present in 1.00L of H_2 ?

The concentration of nitrate ion in drinking water if exceeds 500 ppm, it results in:

What is the permissible limit of Arsenic in drinking water according to W.H.O ?