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California Laboratory Intake Portal - Perchlorate DLR Update

Perchlorate DLR Update

Hello Drinking Water Laboratories,

This e-mail is to inform you of an upcoming perchlorate DLR change that will take effect on January 1, 2024:

On June 17, 2021, the Office of Administrative Law approved changes to the perchlorate detection limit for purposes of reporting (DLR). This regulation was adopted by the State Water Board on October 6, 2020, and took effect on July 1, 2021. As provided in the regulation,

  • The perchlorate DLR will decrease from 0.002 mg/L to 0.001 mg/L on January 1, 2024.

As a reminder, the DLR is a parameter that is set by regulation for each reportable analyte. It is not laboratory specific, and it is independent of the analytical method used. The DLR cannot be changed by the laboratory. It is expected that a laboratory can achieve a Reporting Limit that is lower than or equal to the DLR set by the State.

If your clients have any questions regarding the revised DLR, they should contact their local Division of Drinking Water District Office or Local Primacy Agency.

Additional information on the regulation of perchlorate in drinking water can be found by visiting: CLIP Team Division of Drinking Water State Water Resources Control Board

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