[Dwopcert] Ground Water Rule Reminder

Mon Nov 30 15:56:51 MST 2009

Beginning December 1, 2009, the GWR applies to all PWSs that: 

*        Rely entirely on one or more ground water sources. 

*        Are consecutive systems receiving ground water. 

*        Mix surface and ground water, where ground water is added
directly to the distribution system and delivered to consumers without
treatment equivalent to the treatment provided for surface water. 

Triggered Source Water Monitoring: 

Any ground water system (GWS) that does not have an approved 4-log
removal/inactivation of viruses demonstration and is notified of a
ROUTINE or INCREASED ROUTINE positive total coliform result under the
Total Coliform Rule (TCR) must conduct Triggered Source Water
Monitoring.

Until such time that a plan is received and approved in writing, any
positive ROUTINE or INCREASED ROUTINE total coliform sample taken on, or
after, December 1, will require triggered source water sampling.  All
source(s) contributing to the finished water in the distribution system
at the time the total coliform sample was taken, are to be sampled at
the wellhead (raw water) and the sample is to be processed for either E.
coli, Coliphage or Enterococci.   The sample would need to be
un-chlorinated raw water, or pumped until there is no chlorine residual
prior to sampling.

If a triggered source water sample is positive for a fecal indicator (E.
coli, Coliphage or Enterococci), the state will require the system to
take corrective action or take five additional source water samples from
the same source(s) within 24 hours of notification of the fecal
indicator-positive result and analyze the additional samples for a fecal
indicator. If any one of the five additional samples is fecal
indicator-positive, the system must take corrective action.

GWSs serving fewer than 1,000 people that have a total coliform-positive
result under the TCR may use the triggered source water monitoring
sample collected from the ground water source to meet both the triggered
source water monitoring requirement of the GWR as well as the 4th repeat
"other" sampling requirement of the TCR (must use E. coli as a fecal
indicator for source water monitoring).

For further assistance with the GWR, please contact Donna Calderon, Unit
Manager, Drinking Water Monitoring & Protection Unit, at (602) 771-4641
or dml@azdeq.gov.  Questions related to sample results for TCR or GWR
should be directed to Suzanne Price, Total Coliform Drinking Water Rule
Specialist, at (602) 771-4560 or sop@azdeq.gov.

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