# 77 Ill. Adm. Code 890.1200: Section 890.1200 Water Service Sizing

> Illinois · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1200

## Section

- **Citation:** 77 Ill. Adm. Code 890.1200
- **Heading:** Section 890.1200 Water Service Sizing
- **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 890.1200 Water Service Sizing

## Text

Section 890
Section 890.1200  Water
Service Sizing
a)         Water Service Pipe Sizing.  The water service pipe from the
street main (including the tap) to the water distribution system for the
building shall be sized in accordance with Appendix A, Tables M, N, O, P and
Q.  Water service pipe and fittings shall be at least ¾ inch diameter.  Plastic
water pipe shall be rated at a minimum of 160 psi at 73.4°F. If flushometers or
other devices requiring a high rate of water flow are used, the water service
pipe shall be designed and installed to provide this additional flow.
b)         Demand Load.  The calculation of the water service demand load
for a building shall be based on the total number and types of fixtures
installed in the building, assuming the simultaneous use of such fixtures.
c)         Unused sections of water service or water distribution piping
("dead ends"), where the water in the piping may become stagnant, are
prohibited.  A developed length of more than 2 feet shall be considered a dead
end.

## 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)
- [77 Ill. Adm. Code 890.1120 Section 890.1120  Color Code](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1120.md)
- [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)
- [77 Ill. Adm. Code 890.1160 Section 890.1160  Potable Water Pumping and Storage Equipment](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1160.md)
- [77 Ill. Adm. Code 890.1170 Section 890.1170  Potable Water Supply Tanks and Auxiliary Pressure Tanks](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1170.md)
- [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)
- [77 Ill. Adm. Code 890.1200 Section 890.1200  Water Service Sizing](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1200.md)
- [77 Ill. Adm. Code 890.1210 Section 890.1210  Design of a Building Water Distribution System](https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T77_P890_S890_1210.md)
- [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_1200. Check the current official text before relying on it. Not legal advice.