OPINION: A new study shows we could more than triple water reuse across the state, adding up to 2.1 million acre-feet more to local supplies, greatly relieving pressure on our overburdened rivers and streams.
that offers concrete solutions for saving water through improved water-use efficiency measures, while boosting local water supplies by expanding water reuse and capturing more stormwater that falls on our urban areas.
These savings include: reducing indoor water use with better appliances, toilets, faucets and showerheads; and cutting outdoor water use by changing from water-hungry lawns and landscapes to low-water-using gardens and more careful irrigation systems. Every gallon of water we save is a gallon of water that stays in our stressed rivers and streams or remains in our depleted reservoirs for use later.
California can also dramatically increase the reuse of high-quality treated wastewater. We’re making progress in this area, but slowly. At present, we reuse around 720,000 acre-feet of wastewater — about 24% of the wastewater we produce. But the vast majority of our valuable treated wastewater gets dumped into the ocean.
San Francisco has been innovative in applying some of these strategies already. For instance, on the efficiency side, San Francisco’s Public Utilities Commission’s 2009 retrofit-on-resale ordinance requires high-efficiency plumbing fixtures to be installed in all residential single and multi-family housing upon resale. The program is projected to save over 2.5 billion gallons in cumulative savings through 2045.
The new study addresses untapped potential for California’s cities, but we also know the agricultural sector, which uses 80% of the water humans use statewide, has great potential to grow more food with less water by changing irrigation practices and technologies and shifting crop types.
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