Screening Levels
N/A
Maximum Residual Disinfectant Level
The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
MRDL: 4.0 mg/L
National Primary Drinking Water Regulations for “Chloramines” (Last Updated by the EPA in May 2009)
Units
| Abbreviation | Meaning | Notes |
|---|---|---|
| mg/L | mass of chemical (milligrams, mg) per volume of water (liter, L) | Equivalent to parts per million (ppm) |
For more information about these units and their conversion factors, visit https://cfpub.epa.gov/ncer_abstracts/index.cfm/fuseaction/display.files/fileid/14285.