83 Ill. Adm. Code 600.230
Adequacy of Service
Section 600
Section 600.230 Adequacy of
Service
a) Each utility shall furnish and maintain sufficient facilities
to provide a continuous and adequate supply of water at reasonable pressure.
Unless other acceptable provisions are made to insure continuous service, the
utility should be able to meet the maximum daily demand with its largest well
and/or pump out of service.
b) An average pressure of at least 35 pounds per square inch
(psi) is recommended at the customer's service connection. Under normal
operating conditions, pressure below 20 psi at the customer's service
connection will not be considered reasonable.