Maximum Residual Disinfectant Level

{
  "id": "MLC-T-ENV-016768",
  "term": "Maximum Residual Disinfectant Level",
  "field": "Environment",
  "definition": "Level of a disinfectant added for water treatment that may not be exceeded at the consumer’s tap without an unacceptable possibility of adverse health effects. For chlorine and chloramines, a PWS is in compliance with the MRDL when the running annual average of monthly averages of samples taken in the distribution system, computed quarterly, is less than or equal to the MRDL. For chlorine dioxide, a PWS is in compliance with the MRDL when daily samples are taken at the entrance to the distribution system and no two consecutive daily samples exceed the MRDL. [Definition truncated. For full definition, see 40 CFR 141.2 (CFR 2018)",
  "abbreviation": "MRDL",
  "references": [
    "EPA EV-Regulatory Activities-Regulatory Quantities"
  ],
  "url": "https://mlchart.com/terminology/environment/maximum-residual-disinfectant-level/"
}