&EPA
United States
Environmental Protection!
Agency
Ground Water Rule Compliance Monitoring Requirements
Systems Providing 4-log Treatment of Viruses with Chemical Disinfection
MONITORING REQUIREMENTS
System Size
Monitor What, Where & When
>3,300
People
<3,300
People
Footnot
L. Notify your state that you provide 4-log
treatment of viruses and wish to conduct
compliance monitoring.
2.Contact your state to determine the minimum
disinfectant residual concentration and record
here:
3. Monitor disinfectant residual concentration
continuously at or before the first customer.
4. Record the lowest disinfectant residual
concentration each day that water from the
ground water source is served to the public.
1. Notify your state that you provide 4-log
treatment of viruses and wish to conduct
compliance monitoring.
2.Contact your state to determine the minimum
disinfectant residual concentration and record
here:
3. Monitor disinfectant residual concentration at
or before the first customer.
4.Take grab samples on a daily basis during peak
flow (or at another time specified by the state).
5. If you choose to monitor continuously you
must meet all the monitoring requirements for
systems serving >3,300 people.
If continuous monitoring
equipment fails:
I.You must conduct grab
sampling every 4 hours
until the continuous
monitoring equipment
is returned to service.
2.You must resume
continuous disinfectant
residual monitoring
within 14 days.
If any daily grab sample
is less than the minimum
disinfectant residual
concentration:
I.You must take samples
every 4 hours until
the residual meets or
exceeds the minimum
disinfectant residual
concentration.
Public Notification
1. Failure to monitor is a
monitoring violation
and you must notify
the public with a Tier 3
Public Notice (PIM).1
2. Failure to meet the
minimum disinfectant
residual concentration for
more than 4 hours (i.e.,
2 samples 4 hours apart)
is a treatment technique
violation and you must
notify the public with a
Tier 2 PIM.2
1. Failure to monitor is a
monitoring violation
and you must notify the
public with a Tier 3 PN.1
2. Failure to meet the
minimum disinfectant
residual concentration for
more than 4 hours (i.e.,
2 samples 4 hours apart)
is a treatment technique
violation and you must
notify the public with a
Tier 2 PIM.2
CORRECTIVE ACTION
If the state identifies a significant deficiency
your system, take corrective action.
• A significant deficiency may be identified
during a sanitary survey or at any other time.
• You are required to provide the state with
information requested to complete a sanitary
survey.
Within 30 days of notification:
• You must consult with your state to
determine a corrective action unless the
state specifies a corrective action.
Within 120 days of notification:
• You must complete corrective action; or,
• You must be in compliance with state-
approved corrective action plan and
schedule.
If you fail to take corrective action, you will
incur a treatment technique violation and must
notify the public with a Tier 2 PN.3
• 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.
• 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.
tion you must notify the state within 48
hours of the violation and provide a Tier 3 PN to the public within 1 year (potentially in CCR).
Footnote 2: For this violation you must notify the state as soon as possible but no later than the end of the next business day of the violation and provide a Tier 2 PN to the
public within 30 days.
Footnote 3: 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.
The term "state" is used to refer to all types of primacy agencies including states, U.S. territories, Indian tribes, and EPA.
If your system decides to discontinue 4-log treatment of viruses, you must get state approval and meet triggered source water monitoring requirements. These requirements
are covered in a separate placard.
State/Primacy Agency Contact (name and phone number):.
Office of Water (4606M) EPA 816-F-10-060 www.epa.gov/safewater April 2010
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