1. (a) The system will be adequate to maintain normal operating pressure of not less than 25 pounds per square inch, nor more than 125 pounds per square inch, at the service connection; provided, however, that during periods of hourly maximum demand, or at the time of peak seasonal loads, the pressure may be reduced to not less than 20 pounds per square inch, and during periods of hourly minimum demand the pressure may increase to not more than 150 pounds per square inch. Variations in pressure under normal operation should not exceed fifty percent of the average operating pressure. The average operating pressure should be determined by computing the arithmetical average of at least twenty-four consecutive hourly pressure readings.
2. (b) The quantity of water delivered to the distribution system from all source facilities should be sufficient to supply adequately, dependably, and safely the total requirements of all water consumers under maximum consumption, and should be sufficient to maintain the pressure specified by subsection (a) of this section.
3. (c) The distribution system should provide at least one connection per service and, to the extent feasible, should be designed in a property segmented grid so as (1) to minimize the extent of interruption in water service when repairs are necessary and (2) to avoid dead ends in its water mains.

The water supply and distribution system of a mutual water company proposing to distribute water for human consumption should comply with the following design standards:

Note: Authority cited: Section 25610, Corporations Code. Reference: Section 25140, Corporations Code.