Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 653 - DESIGN, OPERATION AND MAINTENANCE CRITERIA
Subpart A - DESIGN REQUIREMENTS
Section 653.117 - Distribution Systems
Universal Citation: 35 IL Admin Code ยง 653.117
Current through Register Vol. 48, No. 38, September 20, 2024
a) Distribution systems shall be designed to maintain pressures pursuant to Section 653.106.
b) Pipe shall meet provisions of the AWWA Standards, the Standards and Section 653.111.
c) Water mains shall be sized to deliver the required quantity of water at adequate pressure described in Section 653.106 including fire flow where applicable.
d) The system shall be designed to meet existing demands on the distribution system. Future distribution system demands shall be taken into account.
1) The minimum
size water main shall be 4 inch nominal diameter in distribution systems
serving incorporated areas, subdivisions or other closely situated housing or
commercial units.
2) The minimum
size water main shall be 3 inch nominal diameter in distribution systems
serving rural areas where service connections are widely spaced, water usage
per service is low and rates of flow are slow.
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