How are Nitrates detected in drinking water?
A public water system is required to collect water samples at least once a year and analyze them to find out if Nitrates are 50% or more of the MCL. If Nitrates are present above 50% of the MCL, the water system must continue to monitor the contaminant level every 3 months. If Nitrate levels are found to exceed the MCL, the water system must notify the water users and must take steps to reduce the amount of Nitrates so that they are consistently below that level. Additional actions, such as providing alternative drinking water supplies, may be required. If drinking water comes from a private well it should be tested at least once each year. The Monterey County Health Department certified laboratory provides sampling containers and can test the water sample, or the Division of Environmental Health can refer you to a commercial certified laboratory that can test your water for Nitrate. These tests cost about $20.
