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Friday in the Bay Area saw something unusual: Not a drop in housing prices, or a win from the San Francisco Giants. But rain in June. A cold front blustering in from the Pacific Ocean off the Washington and Oregon coast brought gray skies and the first measurable rainfall on Thursday and Friday to the Bay Area’s three biggest cities — San Jose, San Francisco and Oakland — since April 20. And although it sent windshield wipers moving and people digging out raincoats from the backs of their closets, the storm didn’t bring much rain.

There’s a time bomb ticking in California’s Sacramento-San Joaquin Delta. The largest estuary on the West Coast of the Americas, the Delta is a network of some 70 islands protected by more than 1,000 miles of levees. The soil on these islands is some of the richest farmland in the world because it is composed of organic material: decaying plants that accumulated over millennia. But when the levees were built 150 years ago to create farms, this dried out the soil, causing it to oxidize and decompose.

As the drought drags on, South Coast agencies are scrambling to lay the groundwork for a potable water supply that might one day be the region’s largest, after Lake Cachuma: purified and recycled wastewater. For the past 25 years, a small amount of wastewater from sinks, tubs, and toilets has been treated and sprayed on the turf at golf courses, schools, and parks in Santa Barbara and the Goleta Valley. It’s not suitable for drinking, but it keeps the grass green.

Yes, a cold rainy day in Sacramento in June is unusual. But hardly unprecedented. The mild storm that greeted morning commuters Thursday was the first June rainfall in Sacramento in two years, when two days of wet weather briefly interrupted the drought. Before that, the last time it rained in Sacramento in June was in 2013. In fact, Sacramento gets an average of nearly two-tenths of an inch of rain in June, according to the National Weather Service.