&EPA
         United States
         Environmental Protection
         Agency
Ground  Water Rule (GWR) Monitoring Requirements
Water Systems  With Their Own Source that Do  Not Purchase Water or Sell Water to Another
Water System
See additional placards for requirements for wholesale and consecutive systems and those providing 4-log treatment of viruses and conducting
compliance monitoring
TOTAL COLIFORM-POSITIVE

You must conduct triggered sour
ground water well in response to a total coliform-positive
routine sample collected under the Total Coliform Rule (TCR)
unless you are conducting compliance monitoring for 4-log
treatment of viruses.
 Conduct triggered source water monitoring at each ground
  water well WITHIN 24 HOURS1 of being notified of a total
  coliform-positive routine sample.
 If you suspect the total coliform-positive routine sample
  was caused by a distribution system problem, contact your
  state to discuss options.
 Sample from each source in use at the time the total
  coliform-positive routine sample was taken for every total
  coliform-positive routine sample, unless the state has
  approved representative monitoring.
  - Your state may allow you to use representative source
   water monitoring to reduce the number of samples
   collected. Contact your state for approval.
 Sample for the state-approved fecal indicator. Contact your
  state to determine which one(s) is approved and list here:
 Contact your state to ensure you are following the correct
  sampling procedures and contact your lab to ensure you
  are using the appropriate materials for monitoring. If your
  system serves <1,000 people, you may be able to use TCR
  repeat monitoring collected from a ground water source
  to meet GWR requirements. Contact your state for more
  information.
Laboratory Contact Information:
                   FECAL INDICATOR-POSITIVE

                   If your triggered source water
                   monitoring results are fecal
                   indicator-positive, you must:
                    Notify your state and if
                     your state does not require
                     corrective action, collect
                     5 additional source water
                     samples WITHIN 24 HOURS.1
                    The state may invalidate a
                     fecal indicator-positive sample
                     on a case-by-case basis.
                     Contact your state. If your
                     sample is invalidated, you
                     must resample for the same
                     indicator WITHIN 24 HOURS.1
                    Notify the public with a Tier 1
                     Public Notice (PN) WITHIN 24
                     HOURS.
                    Community water systems
                     must notify the public with a
                     Special Notice in your next
                     CCR.
ADDITIONAL MONITORING

If your fecal indicator source
water sample is positive then
the state may require additional
monitoring:
Take 5 samples from each source
that was fecal indicator-positive
WITHIN 24 HOURS.1
 If an additional sample is fecal
  indicator-positive, you must:
 -  Notify the public with a Tier
    1PN WITHIN 24 HOURS.
 -  Community water systems
    must notify the public with a
    Special Notice in your next
    CCR.
 -  Consult with your state and
    take approved Corrective
    Action.
CORRECTIVE ACTION
You have to take correctiv
notified of a fecal indicator-positive additional
sample, a significant deficiency or if the state
requires it in response to a fecal indicator-
positive triggered or assessment sample.
 1 A significant deficiency may be identified
  during a sanitary survey or at any other time.
 1 You are required to provide the state with
  information requested to complete a sanitary
  survey.
 1 Within 30 days of notification you must
  consult with your state to determine a
  corrective action unless the state specifies a
  corrective action.
 1 Corrective Action options are:
  - Correct all significant deficiencies
  - Provide an alternate source of water
  - Eliminate the source of contamination
  - Provide 4-log treatment of viruses.
 1 Within 120 days of notification you
  must complete corrective action, or be in
  compliance with a state-approved corrective
  action plan and  schedule.
 1 If you fail to take corrective action, you will
  incur a treatment technique violation and
  must notify the  public with a Tier 2 PN.2
 1 Community water systems: If you have not
  corrected the significant deficiency before
  the end of the calendar year, you must notify
  the public with a Special Notice in your next
  CCR and repeat  annually until the significant
  deficiency has been addressed.
 1 Noncommunity  water systems: If you have
  not corrected the significant deficiency within
  12 months, you  must notify the public with a
  Special Notice and repeat annually until the
  significant deficiency has been addressed.
 Footnote 2: For this violation you must notify the state within 48 hours of the violation and provide a Tier 2 PN to the public within 30 days.
If you fail to conduct required monitoring within 24 hours of notification of a total coliform- or fecal indicator-positive sample, you must notify the public with Tier 3 PN (possibly in your next CCR).
The term "state" is used to refer to all types of primacy agencies including states, U.S. territories, Indian tribes, and EPA.

State/Primacy Agency Contact (name and phone number):	  Office of Water (4606M)   EPA 816-F-10-058   www.epa.gov/safewater  April 2010

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