Contaminants of Emerging Concern (CEC) Clean Water Legacy - EH: Minnesota Department of Health

Contaminants of Emerging Concern (CEC)
Protecting Minnesota’s Water Resources

Upcoming: CEC Review Prioritization Meeting

CEC Review Prioritization Meeting
June 6, 2019 at 3:30PM
Minnesota Department of Health
625 Robert Street North, Saint Paul, MN

New this year, MDH will be hosting a meeting to discuss and set a draft work plan for the upcoming fiscal year (July 1, 2019 to June 30, 2020). The meeting is open to the public and all who are interested in attending should RSVP to

For more information, please see CEC Nomination and Selection.

The CEC Initiative

Through this initiative, MDH collaborates with partners and the public to identify contaminants of interest; investigates the health and exposure potential of contaminants of emerging concern in water; and informs partners and the public of appropriate actions for pollution prevention and reducing exposures to contaminants that might be unhealthy. The initiative supports the Clean Water Fund mission to protect drinking water sources and the MDH mission to protect, maintain, and improve the health of all Minnesotans. The CEC Initiative has three main areas of work:

  • CEC Nomination and Selection

  • Contaminant Evaluation and Review

  • CEC Special Projects
  • Through this initiative, MDH scientists with experience in exposure assessment, toxicology, water resources, and communication collaborate closely with other state agencies and groups outside of MDH. Partners include the public; various local, state, and federal government agencies; academic organizations; non-profit groups; industry groups; and drinking water and wastewater professional organizations.

    Contaminant Selection Process Changing to Increase Transparency and Engagement

    The Health Risk Assessment Unit is updating our processes for selecting contaminants to develop health-based guidance values in the Contaminants of Emerging Concern (CEC) Initiative. The process change is designed to increase stakeholder engagement and overall transparency in the nomination and selection process.

    The updates align the CEC selection process more closely with the selection process for contaminants reviewed under the Health Risk Limits (HRL) activities. The updated processes also consider the recommendations made by the University of Minnesota in a 2016 review of the CEC Initiative’s selection process.

    The most significant change is that the CEC Initiative will develop a draft annual work plan for fiscal year 2020, which will be discussed at a public meeting on June 6, 2019. Key dates to accommodate that meeting are:

    March 8, 2019: Nominations Received. Contaminants that have been nominated through our online process or directly to program staff before March 8, 2019 will be eligible for the 2020 workplan. This allows our staff to conduct the toxicity and exposure screenings necessary to inform selection discussion in June 2019. MDH will continue to accept nominations on a rolling basis to be included on future work plans.

    In the event of an urgent need for health-based guidance for a specific contaminant, MDH will develop guidance for a contaminant not nominated by March 8, 2019 or included on the annual work plan. In that event, stakeholders will be notified via our GovDelivery email list. 

    Late April 2019: Nominated Status Table and Eligible Contaminants Posted. Between March and April, MDH will screen nominated contaminants for eligibility for health-based guidance development. At the end of April, we will post an updated Nominated Contaminants Status Table and indicate which contaminants are eligible for inclusion in the 2020 work plan.

    Late May 2019: Preliminary Ranking and Meeting Materials Posted. MDH will preliminary rank contaminants for inclusion in the 2020 work plan, which will help guide discussion at the June meeting. Other relevant meeting materials will also be posted to the Contaminants of Emerging Concern (CEC) website.

    June 6, 2019: Public meeting. MDH will host a public meeting to discuss and set a draft work plan for the year. All interested stakeholders are invited.

    Receiving Notifications on Contaminant Selection Activities

    The best way to stay up to date with contaminant selection activities is to subscribe to our GovDelivery email. Major announcements will be posted to our website and shared via GovDelivery.

    Why we study contaminants of emerging concern

    Water quality studies and monitoring in Minnesota find contaminants from products or sources we never suspected in places we never expected, like our lakes, rivers, groundwater and drinking water. These emerging contaminants are found because:

      • improved research methods allow us to look for new chemicals at lower levels than previously possible;
      • industry and individuals are using new chemicals in a variety of products and applications; and
      • old chemicals are being used in new ways. 

    The work of this initiative helps MDH understand the potential health effects of these contaminants. 

    Differences between the CEC Initiative and other MDH health-based guidance programs

    Prior to the Clean Water Fund, MDH was only able to develop human health-based guidances for contaminants that have already been found in groundwater in Minnesota. Through the CEC initiative, MDH takes a proactive approach to the protection of drinking water by considering contaminants that:

    • have been found in groundwater, surface water, or soil; or
    • have not been found in Minnesota, but have the potential to enter our waters. 

    Additionally, this initiative provides information on how people are exposed to these contaminants. These differences separate the work of this initiative from MDH’s other guidance work and supplements existing work.

    CEC Nomination and Selection Process

    CEC Review Prioritization Meeting
    June 6, 2019 at 3:30PM
    Minnesota Department of Health
    625 Robert Street North, Saint Paul, MN

    New this year, MDH will be hosting a meeting to discuss and set a draft work plan for the upcoming fiscal year (July 1, 2019 to June 30, 2020). The meeting is open to the public and all who are interested in attending should RSVP to

    The CEC initiative is proud to include citizen-submitted nominations in our chemical selection process. You can nominate contaminants for consideration by visiting the Nominate Contaminants page. In addition, Minnesota risk managers, stakeholders, and the public are encouraged to nominate contaminants. MDH staff identify additional candidate chemicals through our research and outreach with stakeholders. Health and exposure criteria are used to evaluate and prioritize nominated chemicals. The goal of the CEC initiative is to evaluate (screen) at least ten nominated chemicals every year to identify chemicals for guidance development. The status of each nomination is kept, updated, and summarized in the following table:

    Contaminant Evaluation and Review

    MDH staff research where and how a contaminant is used in the state, its potential to enter Minnesota waters, and its toxicity to humans. If there is sufficient information on health effects, staff calculate water guidance - a concentration of contaminant in water that poses little or no health risk to people drinking that water. For some contaminants, the information is too limited. In this case, the guidance may describe the hazard posed by the chemical instead of a certain level in water. Our goal is to provide guidance for ten contaminants every two years.

    Reviews of chemicals consist of (1) an exposure review, documenting the typical uses of the chemical and where releases are likely to occur (in coordination with the Minnesota Pollution Control Agency (MPCA), the Minnesota Department of Agriculture (MDA), and other parties with access to relevant information); and (2) a toxicological review, providing the most current information on the adverse health effects from exposure to the chemical. Refer to the Health-Based Guidance Development Process web page for more information on guidance development.

    CEC Special Projects

    CEC Special Projects allow MDH staff and qualified partners to consider important questions or issues surrounding CECs. These special projects can be focused on a particular CEC or group of CECs, or they may be designed to increase outreach or provide refined methods in order to evaluate the toxicity of CECs in the future. More information is provided on the Special Projects page.

    Updated Monday, 13-May-2019 06:57:37 CDT