# 77 Ill. Adm. Code 890.1180: Section 890.1180 Flushing/Disinfection of Potable Water System

> Illinois · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1180

## Section

- **Citation:** 77 Ill. Adm. Code 890.1180
- **Heading:** Section 890.1180 Flushing/Disinfection of Potable Water System
- **Jurisdiction:** Illinois
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Illinois Administrative Code / Title 77 PUBLIC HEALTH / CHAPTER I: DEPARTMENT OF PUBLIC HEALTH / Part 890 ILLINOIS PLUMBING CODE / Section 890.1180 Flushing/Disinfection of Potable Water System

## Text

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.

## Nearby sections

- [77 Ill. Adm. Code 890.1110 Section 890.1110  Quality of Water Supply](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1110.md)
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- [77 Ill. Adm. Code 890.1130 Section 890.1130  Protection of Potable Water](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1130.md)
- [77 Ill. Adm. Code 890.1140 Section 890.1140  Special Applications and Installations](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1140.md)
- [77 Ill. Adm. Code 890.1150 Section 890.1150  Water Service Pipe Installation](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1150.md)
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- [77 Ill. Adm. Code 890.1180 Section 890.1180  Flushing/Disinfection of Potable Water System](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1180.md)
- [77 Ill. Adm. Code 890.1190 Section 890.1190  Water Supply Control Valves and Meter](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1190.md)
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- [77 Ill. Adm. Code 890.1220 Section 890.1220  Hot Water Supply and Distribution](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1220.md)
- [77 Ill. Adm. Code 890.1230 Section 890.1230  Safety Devices](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1230.md)
- [77 Ill. Adm. Code 890.1240 Section 890.1240  Miscellaneous](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1240.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1180. Check the current official text before relying on it. Not legal advice.