Groundwater Rule


The U.S. Environmental Protection Agency (EPA) published the Ground Water Rule (GWR) on November 8, 2006.  The purpose of the GWR is to provide increased protection against microbial pathogens, specifically bacterial and viral pathogens, in public water systems that use ground water. Instead of requiring 4-log treatment for all ground water systems, the GWR establishes a risk-targeted approach to identifying systems that are susceptible to fecal contamination. The GWR requires systems at risk of microbial contamination to take corrective action to protect consumers from harmful bacteria and viruses. The compliance deadline for the GWR is December 1, 2009. The basic requirements of the GWR include:

  • Sanitary surveys
  • Source water monitoring
  • Compliance monitoring
  • Corrective actions

Groundwater Rule Documents