(a) Parks constructed between July 11, 1979 and July 6, 2004, shall have water distribution systems capable of providing a pressure not less than fifteen (15) pounds per square inch at each lot at maximum operating conditions. Parks constructed before and after the above dates must be capable of maintaining twenty (20) pounds per square inch at maximum operating conditions.

(b) The testing of a water system in a park to determine the maximum operating condition shall be either performed at the reported time of maximum water pressure loss, if within normal business hours, or measured with twenty-five (25) percent of the required lot water supply outlets, as defined in section 1308 of this chapter, open with the pressure metering device at the end of the tested line.