Posts made in June 2022

DDW Releases Draft CrVI MCL

The Division of Drinking Water (DDW) posted an “administrative draft” of the Maximum Contaminant Level (MCL) for hexavalent chromium (CrVI). The draft MCL is 0.010 mg/L.
DDW posted draft revisions to Title 22 regulations, a staff report and attachments, and (3) announcement they will hold workshops on April 5th (at 5:30 pm) and April 7th (at 9:00 am).

The DDW announcement includes the following statement: “The formal procedure for adopting [the] regulation under the Administrative Procedure Act has not yet begun, and these workshops are not part of that process. However, input provided on the proposed administrative draft of the MCL may be used to inform the development of the regulation.”

The draft revisions to Title 22 indicate that the Compliance Date for the CrVI MCL for systems serving a population of 10,000 or more would be two years after the regulation takes effect. The Compliance Date would be three years after the regulation takes effect for systems serving a population from 1,000 to 9,999, and the Compliance Date would be four years after the regulation takes effect for systems serving less than 1,000.

The announcement contains a link to watch the workshops. The workshops will include a presentation by DDW of the draft MCL followed by an opportunity for public comment.

Written public comments on the administrative draft MCL and compliance language are due by April 29, 2022.

OEHHA Releases Recommended NL for PFHxS

On March 21, 2022, the California Office of Environmental Health Hazard Assessment (OEHHA) released a recommended Notification Level (NL) for perfluorohexane sulfonic acid (PFHxS). The recommended NL is 2 parts per trillion (2 ppt), based on a noncancer endpoint (decreased thyroid hormone levels). Copy of OEHHA’s supporting documentation is here: