Nitrate is an essential nutrient for plants but must be monitored in order to maintain proper health and optimum yield. Excessive levels are detrimental and can even be toxic, effectively "burning" the plants. Nitrate can be found in natural surface water, as well as in underground water. In drinking water, the nitrate level must be monitored because of its toxic nature. Domestic water supplies should not contain nitrate in excess of 45 mg/L
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