The Alameda County Water District has a long-term financial obligation as a member of the State Water Project and collects a portion of its state water costs on the property tax bill. The amounts collected are adjusted each year based on the District’s state water costs. The State Water Project provides about 40% of the District’s water supply in a typical year.
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The property owner is generally responsible for all pipes and plumbing on the "customer side" of the water meter. This includes the interior plumbing of the home, the outside irrigation system, and the area where the property's water system connects to the water meter.
Since water meters are mechanical devices, their accuracy decreases over time which means a corresponding loss of potential revenue. To gain additional accuracy, however, would mean replacing the meters at additional cost.
How old does a meter have to be before it makes economical sense to replace it? To answer this question, the District used statistical sampling methods to determine meter accuracies over time. An economical analysis was then performed to determine an optimal replacement age. Together with operational factors, the optimum age at which to replace plastic meters in the District was found to be approximately 15 years old.