1. MDL- Minimum Detectable Level
(The smallest level that can be detected by test).
2. MCL- Maximum Contaminent Level ; In 1974,
Congress passed the Safe Drinking Water Act. This law requires
EPA to determine safe levels of chemicals in drinking water which
do or may cause health problems. These non-enforceable levels,
based solely on possible health risks and exposure, are called
Maximum Contaminant Level Goals. Based on this MCLG, EPA has set
an enforceable standard called a Maximum Contaminant Level. MCLs
are set as close to the MCLGs as possible, considering the
ability of public water systems to detect and remove contaminants
using suitable treatment technologies.