Perchlorate in Drinking Water
Perchlorate is a naturally occurring and manufactured chemical anion that consists of one chlorine atom bonded to four oxygen atoms (ClO4-). Perchlorate is commonly used as an oxidizer in rocket propellants, munitions, fireworks, airbag initiators for vehicles, matches and signal flares. It is naturally occuring in some fertilizers.
As part of EPA’s commitment to ensuring the safety of America’s drinking water, the agency is seeking public input on the materials that will undergo independent, expert peer review to help inform the agency’s decision making on perchlorate under the Safe Drinking Water Act. This is the second peer review the agency will undertake to determine the appropriate scientific approach for understanding the adverse health impacts of perchlorate in drinking water. After the peer review is complete, EPA will take the next appropriate steps under the Safe Drinking Water Act.
EPA is announcing a public peer review meeting and the final list of expert peer review panelists. EPA expects the peer review panelists will participate in a two-day peer review meeting on January 29-30, 2018, to discuss the scientific basis of the perchlorate supporting documents. The public may attend the meeting in-person or via teleconference and may request to make a brief oral statement by pre-registering by January 17, 2018, using the process described in the Federal Register Notice. The final charge questions for the panel may be viewed in Docket ID No. EPA-HQ-OW-2016-0439. Following the peer review meeting, a peer review summary report will be prepared and will be made available to the public.
- Federal Register Notice: Peer Review to Inform the Safe Drinking Water Act Decision Making on Perchlorate in Drinking Water
Federal Register Notice: Request for Public Comments to be sent to Versar, Inc., on an Interim List of Perchlorate in Drinking Water Expert Peer Reviewers and Draft Peer Review Charge Questions - September 15, 2017
Federal Register Notice: Request for Public Comments to be sent to EPA on Peer Review Materials to Inform the Safe Drinking Water Act Decision Making on Perchlorate - September 15, 2017
Peer Review of Previous
A peer review was completed for the previous Perchlorate Biologically Based Dose Response (BBDR) model and model report. A panel meeting of the peer reviewers was held on January 10 and 11, 2017, in Arlington, Virginia. The Peer Review Summary Report for the previous peer review is available in Docket ID No. EPA-HQ-OW-2016-0439.
Technical Fact Sheet
Perchlorate Reference Dose
Interim Health Advisory
Interim Drinking Water Health Advisory for Perchlorate, EPA 822-R-08-25, December 2008
Federal Register Notices
Public Meeting Notices
- Notice of a Public Meeting: Stakeholder Meeting Concerning EPA's Intent To Regulate Perchlorate Levels in Drinking Water - September 20, 2012
- Notification of a Public Meeting and Public Teleconference of the Science Advisory Board: Perchlorate Advisory Panel - July 18-19, 2012 and September 25, 2012
- Notice of a Public Meeting: Environmental Justice Considerations for Drinking Water Regulatory Efforts - March 3, 2011