In the past 25 years, California’s Salton Sea has grown more polluted and hazardous as it has lost one-third of its water. Shrinkage of similar lakes elsewhere mainly stems from warming trends and water diversion.
But a new paper in the journal Water Resources Research suggests that might not be the case with California’s most polluted inland lake.
Two of the biggest reservoirs in the Colorado River Basin, Lake Mead and Lake Powell, have lost 50% of capacity within the past five years.
And, it’s only getting worse.
Now, the Interior Department is proposing more solutions to help the dwindling river.
Colorado regulators, after years of study, negotiations and testing, approved a new rule that clears the way for drinking treated wastewater this week, one of only a handful of states in the country to do so.
The action came in a unanimous vote of the Colorado Water Quality Control Commission Oct. 11.
Direct potable reuse (DPR) involves sophisticated filtering and disinfection of sewage water for drinking water purposes, with no environmental buffer, such as a wetland or river, between the wastewater treatment plant and drinking water treatment plant. That water is then sent out through the city’s drinking water system.
The federal government is designating $4 billion from the Inflation Reduction Act for drought mitigation work in the Colorado River basin.
On Wednesday, the Department of the Interior announced that total, indicating that $500 million will go to efficiency upgrades in the river’s Upper Basin states of Colorado, Utah, New Mexico, and Wyoming. Another chunk of IRA money will be set aside for direct payments to farmers and ranchers to forgo water deliveries from Lake Mead in the river’s Lower Basin, primarily in Arizona and California. Federal officials are not specifying how much money will be available for that first round of payments.
California’s offer to conserve some of its share of Colorado River water over the next few years won’t solve the looming water and power crisis in the West — but it might be enough to kickstart negotiations among the states on a deal that could.
The biggest hurdle to striking an agreement that would sharply curtail water use among the seven states that share the river has been the impasse between the two thirstiest states — California and Arizona — over which should shoulder the brunt of the cuts as climate change fuels the deepest drought in the region in 1,200 years.
Internationally, the polar bear may be the climate-change canary in a coal mine.
Locally, it could be the avocado.
The fruit so identified with San Diego County agriculture has been on the decline for years. Severe weather, water availability and rising water prices — at least in part attributed to climate change — have reduced the yield of the crop and the revenue it generates.
California water agencies that use Colorado River water indicated Wednesday they’d be willing to cut 400,000 acre-feet of water use annually starting next year and running through 2025 — a move a top Upper Basin water official cast as a promising development in the negotiations over the future of the river.
“All in all, it appears to be an encouraging first step,” said Chuck Cullom, executive director of the Upper Colorado River Commission, an interstate agency that manages water in the Upper Basin states of Colorado, Wyoming, Utah and New Mexico.
Collaboration among all water users is key to developing solutions for the Colorado River Basin, which is in the midst of a 22-year megadrought. That was one of the common themes during a webinar Thursday, in which water managers and other officials discussed ways to slow or stabilize the rate of decline of the major source of water for seven states and Mexico.
California water agencies that use Colorado River water indicated Wednesday they’d be willing to cut 400,000 acre-feet of water use annually starting next year and running through 2025 — a move a top Upper Basin water official cast as a promising development in the negotiations over the future of the river.
California water agencies that rely on the parched Colorado River said Wednesday they can reduce their use by one-tenth starting in 2023 in response to calls for cuts from the federal government.
