Contaminants of Emerging Concern (CEC) Protecting Minnesota’s Water Resources
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:
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.
The best way to stay up to date with the CEC Initiative's 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 guidance for contaminants that have already been found in groundwater in Minnesota. The CEC initiative allows MDH to take 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.
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. Risk managers and stakeholders as well as the public are encouraged to nominate contaminants. MDH staff may identify additional candidate chemicals through our research and outreach with stakeholders.
MDH staff conduct a screening level evaluation of toxicity and exposure potential for nominated contaminants. Based on the screening results, MDH assigns a preliminary ranking of high, medium, or low to each contaminant. MDH uses the preliminary ranking to inform selection of contaminants for an in-depth toxicological review and guidance development. A CEC guidance development workplan is developed annually based on a contaminant’s preliminary ranking, availability of sufficient toxicological information, and stakeholder input. MDH prefers to share and discuss the draft workplan for the upcoming fiscal year at a public stakeholder meeting. However, due to the challenges and concerns regarding COVID-19 the face-to-face public meeting for this year was cancelled. In place of the face-to-face meeting, background materials and a preliminary workplan were posted on this webpage. A 30-day open informal comment period was held so that stakeholders and the public could comment and provide feedback on the 2021 workplan. A timeline for the workplan process is provided below.
Early to mid-June: Posted the following materials (Table updated October 2020)
- Updated Nominated Contaminants Status Table (Updated October 2020) (PDF)
- Preliminary Ranking Results (PDF)
End of June 2020: Posted the following materials:
Part 1: CEC Initiative’s Nomination, Screening and Ranking Process (video)
Part 2: CEC Initiative’s Ranking Results and Preliminary 2021 Workplan (Video)
Preliminary Work Plan
All interested stakeholders were invited to provide feedback on the posted materials and preliminary workplan and to submit comments by the end of July.
Please submit comments by emailing them to: firstname.lastname@example.org.
MDH staff would be happy to schedule teleconference calls or arrange virtual meetings with stakeholders for one-on-one discussions prior to submission of comments.
July 31, 2020: End of informal comment period.
August 11, 2020: Posting of the following materials:
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.
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 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.