San Diego Could Use New Method of Pumping Purified Wastewater Directly Into Water System — Saves Money for Pure Water Project
By David Garrick /// San Diego Union-Tribune / October 26, 2025
San Diego may shift the second phase of the city’s Pure Water sewage recycling system to a more efficient purification method that could save billions of dollars, preventing steep jumps in local sewer and water bills.
The new method could dramatically change the size, scope and cost of the massive project’s Phase Two, which had been expected to be nearly twice as large as the nearly complete first phase.
City officials say it could let them avoid building expensive pipelines to either San Vicente Reservoir or Lake Murray from a new purification plant to be built in Mission Valley.
That change is possible because California recently loosened its purification rules to allow purified wastewater to be pumped directly into a water system, instead of being stored for months in reservoirs or underground basins.
The rule change, which took effect last fall, came just as San Diego was already re-evaluating Phase Two of Pure Water, because conservation has depressed local water demand and construction costs have soared.

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