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Division of Drinking and Ground Waters Ground Water Rule



Ground Water Rule

The Ground Water Rule (GWR) was promulgated by U.S. EPA on November 8, 2006 to provide increased protection against pathogens in public water systems using ground water sources. Starting on December 1, 2009, the rule requires public water systems to conduct triggered source water monitoring, unless they demonstrate 4-log (99.99%) removal or inactivation of viruses.  For more information, see the letter sent to community and major noncommunity public water systems for more information on upcoming requirements.

Application Form for Ground Water Rule 4-log Treatment of Viruses (due September 1, 2009):

Excel spreadsheet to determine contact time:

Ohio EPA Q & A on Ground Water Rule

Noncommunity public water systems serving less than 1000 people are encouraged to review U.S. EPA's fact sheet on the Ground Water Rule. Additional information is also available on the U.S. EPA Web site.

Guidance for Ground Water Rule Triggered Source Water Monitoring Plans and Options for Reducing Samples
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Contact the Division of Drinking and Ground Waters
Mailing Address: P.O. Box 1049, Columbus, OH 43216-1049
Street Address: 50 West Town Street, Suite 700 Columbus, OH 43215
Phone: (614) 644-2752 ~ Fax: (614) 644-2909 ~ E-mail
Emergency Contacts ~ Staff Contacts and Expertise ~ Electronic Mailing Lists
Emergency Response Hotline (800) 282-9378
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