In 2006, the department adopted a risk-based corrective action process, also known as RBCA (pronounced "Rebecca"). Adopting risk-based decision-making was initiated when the department decided to move away from using drinking water standards as the clean-up criteria for contaminated groundwater, when the groundwater was not and will not be used as drinking water. The risk-based corrective action process provides a framework for remediating, or cleaning up, contaminated sites based on the risks the contamination poses to human health and environmental as it relates to how the site is used, both now and in the future. For general information about risk-based corrective action, visit Missouri Risk-Based Corrective Action (MRBCA). For information about the MRBCA process the department uses to manage petroleum releases at petroleum storage tank sites, visit Tanks Risk-Based Corrective Action.

In 2009, the department, with the assistance of stakeholders, developed a risk-based corrective action rule to codify the process and its key elements and methodologies. The rulemaking process involved both the Clean Water Commission and the Hazardous Waste Management Commission. The Risk-Based Corrective Action Process rule, found in Code of State Regulations 10 CSR 25-18.018, was adopted in June 2009 and became effective on Oct. 31, 2009.

The RBCA guidance documents are provided below. Updates made to the April 2006 guidance in June 2006 and June 2008 have been incorporated into this version of the guidance. For information regarding any future changes, visit the department's MRBCA Revision Information webpage. If revisions are made, the guidance below will be amended.

Main Guidance

Complete Main Text

By Section


Complete Appendices

By Section