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DWQ - Statewide General Permit for Landscape Irrigation Uses of Recycled Water

Recycled Water – Constituents of Emerging Concern (CECs)

2018 Science Advisory Panel on CECs in Recycled Water

In accordance with the provisions of the Recycled Water Policy and Resolution 2016-0061 and Resolution 2017-0034, the State Water Resources Control Board (State Water Board) provided a grant to the Southern California Coastal Water Research Project (SCCWRP) to reconvene the 2010 Science Advisory Panel for Recycled Water (Panel) that presented recommendations for monitoring constituents of emerging concern (CECs) in recycled water.

The panel members are:

  • Dr. Paul Anderson (human health toxicologist)
  • Dr. Nancy Denslow (biochemist)
  • Dr. Jörg Drewes (Panel Chair and civil engineer)
  • Dr. Adam Olivieri (epidemiologist/risk assessor)
  • Dr. Daniel Schlenk (environmental toxicologist)
  • Dr. Shane Snyder (analytical chemist)
  • Walter Jakubowski, M.S. (human health pathologist).

The reconvened Panel will review the conceptual framework developed in the 2010 report titled “Monitoring Strategies for Chemicals of Emerging Concern (CECs) in Recycled Water,” evaluate the scientific literature since the Panel met last, and assess potential health risks associated with CECs in various water recycling practices allowed under the California Code of Regulations (CCR), Title 22, and the use of recycled water for augmentation of surface water reservoirs used to supply drinking water (surface water augmentation), and generate an updated report. Using advice from a diverse stakeholder group, the Panel will specifically address the following:

  • The appropriate constituents to be monitored in recycled water, including analytical methods and method detection limits
  • The known toxicological information for the list of constituents
  • Any changes to the list of constituents developed based on level of treatment and uses as specified in Title 22 and for surface water augmentation
  • The indicators or surrogates that can be used to represent a suite of CECs
  • The concentrations of CECs that should trigger enhanced monitoring.

The Panel will also provide recommendations for additional research regarding antibiotic resistant bacteria and antibiotic resistance genes related to the use of recycled water for surface water augmentation and other uses allowed under Title 22 to further understand potential human exposure and potential impacts to human health. This assessment will serve to supplement recommendations from a previous expert panel that provided an in-depth review of antibiotic resistant bacteria and antibiotic resistance genes relative to direct potable reuse.

2018 CEC Science Advisory Panel for Recycled Water Schedule

July 19-21, 2017 Panel Meeting #1
December 11-15, 2017 Panel Meeting #2
January 2018 Draft Report released for Public Comment
30 Days after Draft Release Public Comments on Draft Due
February 29, 2018 Final Report due to State Water Board
TBD State Water Board Workshop
December 31, 2018 Project end date

The SCCWRP website contains additional information on the Science Advisory Panel on CECs in recycled water.

2010 Science Advisory Panel on CECs in Recycled Water

In accordance with the provisions of the Recycled Water Policy, a Science Advisory Panel was established to address questions about regulating CECs with respect to the use of recycled water. The Panel’s primary charge was to provide guidance for developing monitoring programs that assess potential CEC threats from various water recycling practices, including groundwater recharge/reuse and urban landscape irrigation. Under contract with the State Water Resources Control Board and using advice from a diverse stakeholder group, SCCWRP convened the CEC Science Advisory Panel. The panel members were:

The SCCWRP website contains additional information on the Science Advisory Panel on CECs in recycled water.

Public Hearing: Recommendations for Monitoring CECs in Recycled Water

The State Water Board held a public hearing on December 15, 2010 to accept comments on the recommendations for monitoring CECs in municipal recycled water used for groundwater recharge/reuse and landscape irrigation as presented in the Staff Report. The Staff Report is based on the recommendations presented in the CEC Science Advisory Panel’s report and provided by the California Department of Public Health (CDPH). The Staff Report also presents recommendations for additional research on CEC monitoring.

 

Bioanalytical Techniques for Monitoring CECs

The State Water Board recognizes that assessing how CECs affect both recycled and ambient discharged water cannot be achieved through chemical monitoring alone. In 2011, the State Water Board contracted with SCCWRP to establish and manage a team of investigators to develop bioassays to identify known and unknown CECs that may potentially be found in recycled water as envisioned by the CEC Science Advisory Panel. As part of this effort, the team identified an extraction protocol for isolating and concentrating CECs from recycled water, identified and tested currently available bioanalytical kits with a variety of modes of action that could potentially be used to assess CECs in recycled water, and developed an interpretive framework to facilitate the decision making process when identifying threats to human health.

The SCCWRP website contains additional information on Bioanalytical Techniques for Monitoring CECs.

Additional Information on CECs and Recycled Water

Questions or comments?

(Updated 9/8/17)