Section 890.1180 Flushing/Disinfection of Potable Water System

Section 890

Section 890.1180

Flushing/Disinfection of Potable Water System

New or repaired potable water

systems shall be flushed or disinfected prior to use as follows:

a)         Chlorinated Water Supply.  If the potable water supply serving

the water supply system is chlorinated, e.g., a community water system, the

water supply system, or appropriate repaired portion, shall be flushed with

clean, potable water until no dirty water appears at the point of outlet.

b)         Non-Chlorinated Water Supply.  The pipe system shall be

flushed with clean, potable water until no dirty water appears at the point of

outlet.

1)         The system, or part of the system, shall be filled with a

chlorine solution containing at least 50 parts per million of chlorine and

shall be valved off and allowed to stand for 24 hours, or the system, or part of

the system, shall be filled with a chlorine solution containing at least 200

parts per million of chlorine and be allowed to stand for three hours.

2)         Following the required contact (standing) time, the system

shall be flushed with clean, potable water until the chlorine level in the

water discharging from the system is within acceptable limits for potable

water, i.e., generally until the water has no detectable chlorine odor.

3)         To ensure that the water supplied by the water system is safe

for drinking, a bacteriological examination of a water sample taken from the

water supply system shall be secured.  This examination shall be performed by a

laboratory certified in accordance with 77 Ill. Adm. Code 465.  The chlorine

residual in any water sample collected for examination shall not exceed 4 parts

per million (or 4 milligrams/liter) for a reliable laboratory result.  If the

examination reveals that contamination still persists in the system, the

procedure for disinfection shall be repeated.