California Lowers Perchlorate DLR

Perchlorate Detection Limit for Purposes of Reporting (DLR)

On October 6, 2020 the State Water Resources Control Board (SWRCB) voted to adopt the Division of Drinking Water’s proposal  to lower the perchlorate DLR in a two-step process.  On June 17, 2021 the Office of Administrative Law approved the regulation to lower the perchlorate DLR and the regulation will go into effect on July 1, 2021.

What Will Change?  The perchlorate DLR will be lowered from 0.004 mg/L to 0.002 mg/L effective July 1, 2021 and will be lowered again to 0.001 mg/L effective January 1, 2024.