The Groundwater Rule (GWR), which took effect December 1st, 2009, applies to all public water systems that use groundwater sources or purchase groundwater. The primary purpose of the rule is to protect the public from fecal-related bacterial and viral pathogens in public groundwater systems. E. coli
is used as the indicator of fecal contamination. If a groundwater source (well or spring) is found to be fecally contaminated, the public water system must take corrective action to assure that their consumers are adequately protected. See the following resources for more information.
- Groundwater Rule Monitoring: Information on Groundwater Rule requirements for triggered, assessment, confirmation and compliance monitoring, as well as related resources.