EPA method 5310B
Total Organic Carbon (TOC) stands for the total organic carbon in water. Sounds innocuous enough, but when water contains high levels of organic carbon it can make ingestion of the water toxic. There are naturally occurring carbon compounds in water but the ones we care most amount are the ones that pose a health threat when we drink it. Carbon compounds include insecticides, herbicides and other agricultural chemicals that enter drinking water sources from rain runoff or from discharges from industrial waste, accidental spills or leaks. In any event, we don’t want to drink it or ingest it for fear of sickness or death. So before water goes into our system from municipal water systems, commercially produced bottled water, pharmaceutical water or any other source it is tested to make sure it is safe.