Groundwater Rule Requirements

Compliance with the Ground Water Rule is required by the Public Water Supply Rules and the Administrative Rules of Montana ARM 17.38.211.

The Ground Water Rule, 40 CRF Part 141 Subpart S (Sections 400-405).

Final Requirements: The rule addresses risks through a risk-targeting approach that relies on four major components:

  1. Periodic sanitary surveys of ground water systems that require the evaluation of eight critical elements and the identification of significant deficiencies (e.g., a well located near a leaking septic system). States must complete the initial survey by December 31, 2012 for most community water systems (CWSs) and by December 31, 2014 for CWSs with outstanding performance and for all non-community water systems.
  2. Source water monitoring to test for the presence of E. coli, enterococci, or coliphage in the sample. There are two monitoring provisions: -Triggered monitoring for systems that do not already provide treatment that achieves at least 99.99 percent (4-log) inactivation or removal of viruses and that have a total coliform-positive routine sample under Total Coliform Rule sampling in the distribution system. -Assessment monitoring-As a complement to triggered monitoring, a State has the option to require systems, at any time, to conduct source water assessment monitoring to help identify high risk systems.
  3. Corrective actions required for any system with a significant deficiency or source water fecal contamination. The system must implement one or more of the following correction action options:
    • correct all significant deficiencies,
    • eliminate the source of contamination,
    • provide an alternate source of water, or
    • provide treatment which reliably achieves 99.99 percent (4-log) inactivation or removal of viruses.
  4. Compliance monitoring to ensure that treatment technology installed to treat drinking water reliably achieves at least 99.99 percent (4-log) inactivation or removal of viruses.

EPA GUIDANCE ON THE GROUND WATER RULE (EPA):

Quick Reference Guides to GWR

  • Ground Water Rule: A Quick Reference Guide (PDF) (2 pp, 795K) EPA-816-F-08-029, July 2008
  • Ground Water Rule Compliance Monitoring: A Quick Reference Guide (PDF) (2 pp, 369K) EPA-815-F-08-008, July 2008
  • Ground Water Rule Sample Collection and Transport: A Quick Reference Guide (PDF) (2 pp, 632K) EPA-815-F-08-007, July 2008
  • Ground Water Rule Triggered and Representative Monitoring: A Quick Reference Guide (PDF) (3 pp, 1M) EPA-815-F-08-004, July 2008

For other quick reference guides visit the drinking water standards - quick reference guides page

Fact Sheets

  • Ground Water Rule Factsheet: General Rule Requirements (PDF) (5 pp, 207K) EPA-816-F-08-028, July 2008
  • Ground Water Rule Factsheet: Monitoring Requirements (PDF) (6 pp, 135K) EPA-816-F-08-025, July 2008
  • Ground Water Rule Factsheet: Sanitary Surveys (PDF) (5 pp, 143K) EPA-816-F-08-027, July 2008
  • Ground Water Rule Factsheet: Public Notification and Special Notice Requirements for Community Water Systems (PDF) (6 pp, 221K) EPA-816-F-08-026, July 2008
  • Ground Water Rule Factsheet: Public Notification and Special Notice Requirements for Noncommunity Water Systems (PDF) (5 pp, 106K) EPA-816-F-08-030, July 2008
  • Ground Water Rule Total Coliform Rule Smaple Overlap Guidance

QUESTIONS ABOUT THE GROUNDWATER RULE?

Call (406) 444-4400 Additional Information

Complying with the Ground Water Rule: Small Entity Compliance Guide EPA 815-R-07-018, July 2007

This guidance document is intended to be an official compliance guide to the GWR for small public water systems, as required by the Small Business Regulatory Enforcement Fairness Act of 1996. This guide contains a general introduction and background for the GWR, describes the specific requirements of the GWR and provides information on how to comply with those requirements Target Audience: Small ground water systems.

Complying with the Ground Water Rule: Small Entity Compliance Guide (PDF) (50 pp, 1.5MB)

Federal Register Publication of the Final Rule

The Final Ground Water Rule was published in the Federal Register November 08, 2006.

A correction to the table on Analytical Methods For Source Water Monitoring was published in the Federal Register November 21, 2006.