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How to Interpret the digits in the analysis report?
The most important information on your water test report are the actual results that the laboratory found for your water sample. The numbers indicate the concentration of each water quality parameter in your water sample. In some cases, the unit of measure for each test will be shown next to the result. In others, the units will be shown in a separate column. The result for each test should be compared to the appropriate water/effluent standard for that parameter. Sometimes, a water test result will be reported as “ND” (Not Detected), which means that the lab was unable to detect any of that pollutant with its equipment. Similarly, some results may have a less than sign (<) in front of a number. This result means the sample contained less than the detection level for that test. Detection levels are often set at the permissible limit for a particular pollutant. If the less-than symbol (<) appears before a number and the number is equal to the drinking water standard, the water is likely safe to drink for that particular contaminant.
Concentrations of pollutants are usually measured in water by a unit of weight such as milligrams per liter (mg/L), or by number such as number of bacteria per 100 milliliters of water (#/100 ml). You might see several different measurement units on your water test report.