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STATE OF
DRINKING WATER PROGRAM
DIVISION OF HEALTH ENGINEERING
BUREAU OF HEALTH
DEPARTMENT OF HUMAN SERVICES
11 STATE HOUSE STATION
Revision Date: August 7, 2003
REQUIREMENTS FOR INSTALLATION OF CONTINUOUS CHLORINATION SYSTEMS
The
continuous chlorination system shall consist of the following items:
1. A chemical feed pump, which
is paced to the flow of potable water in the system.
2. A chlorine solution tank.
3. A minimum of 10 minutes of
contact time from the chlorine solution injection point to the first customer.
4. A free chlorine residual
monitoring kit.
5. Maintain a free chlorine
residual in the distribution system within the range of 0.2 mg/l to 0.7 mg/l
The
Drinking Water Program recommends that you contact a water treatment professional
for an evaluation of your water and water system before installation of a
chlorination system. Elevated levels of
iron, manganese and other inorganics may interfere with the intended operation
of your chlorination system.
Additionally, other treatment processes may affect or be affected by the
addition of chlorine.
All
treatment changes at public water systems must be reviewed and approved by the
DWP prior to construction. However, if
the system is installed in accordance with the enclosed Continuous Chlorination
Disinfection System Installation Guidance Document, prior review of the system
is not required. The DWP will conduct a
post construction inspection of the system to ensure the system meets all DWP
requirements. Please notify the DWP as
soon as the disinfection system has been installed so a field engineer can
inspect it.
After the continuous chlorination system is operational, a free chorine residual must be maintained throughout the system. The PWS must submit monthly operational reports, indicating residual levels, to the DWP by the tenth day of the month following the compliance month. Chlorine residual samples must be collected daily for a period of four weeks immediately following installation of the disinfection system. After the DWP has determined that the chlorine residual has been maintained at consistent levels, sampling for chlorine residuals may be reduced depending on system size and complexity. Reduced monitoring shall be no less than twice per week. However, the DWP reserves the right to require increased monitoring if problems arise with the PWS. If you need further information please contact a member of the Field Services Section at (207) 287-2070.