Chloride reports and guidance documents

The MPCA partnered with many local stakeholders to investigate and evaluate the impact of chloride on Minnesota water resources. Their collaboration has produced several technical reports, guidance documents, and other resources.

Technical reports


MPCA report: 30% of Twin Cities wells have too much chloride

The MPCA groundwater program released its report regarding the findings of their monitoring efforts. Chloride concentrations were above the water quality standards in 30% of the wells in the Twin Cities metro area.

Inter-Agency Advisory Team: Provides high level oversight, support and guidance. Meets periodically Technical Advisory Committee: Provides review, guidance and support for the technical aspects of the project. Meets quarterly. Implementation Plan Committee: Provides guidance on the development of the implementation plan. Meets 2-3 times near the end of the project. Monitoring Sub-Committee: Subset of experts from the IAT and TAC. Provides detailed technical guidance and support regarding the water quality monitoring component of the project. Meets as needed. Outreach Group: Informal group, part of the audience that the MPCA will target to share project updates and information. Project Manager: MPCA staff who coordinates and leads this effort. Works with agency staff to meet the project needs and long term goals. Outreach & Education Committee: Consists of state and local education specialists.  Will assist with the development of “toolbox” for a broad outreach campaign for road salt education that can be utilized by local partners and road authorities.

Chloride Work Group (Wastewater)

MPCA worked with volunteers from municipalities across Minnesota to develop a policy to address the increasing chloride problem for municipal wastewater discharges.  The policy was submitted to the MPCA Commissioner and Advisory Committee on April 18, 2017.

See the Commissioner’s signed memo and documents referenced below.

Chloride variance requests

Surface water monitoring guidance documents

The following documents were developed by the local water resource monitoring experts to provide specific guidance for monitoring chloride in lakes, streams, and storm sewers.

Additional resources

Information from chloride project meetings

MPCA presentations