South Lahontan

The South Lahontan region spans 17 million acres of land in central to southeastern California, encompassing numerous mountain ranges such as the Sierra Nevada, the Techachapi Mountains, the San Gabriel Mountains, and the San Bernardino Mountains; the region also hosts Mt. Whitney, the highest point in the contiguous US at 14,495 feet above sea level, as well as Death Valley, the lowest point at 282 feet below sea level.

Hexavalent Chromium Maximum Contaminant Level (MCL) Standardized Regulatory Impact Assessment (SRIA)

California State Water Resources Control Board (SWRCB) | May 4th, 2023

Summary

The Division of Drinking Water (DDW) of the State Water Resources Control Board (State Water Board) is responsible for adopting drinking water standards. Primary drinking

Hot Drought of Summer 2023 in Southwestern North America

American Geophysical Union (AGU) | September 17th, 2025

Summary

Hot droughts, or compound drought and heatwaves, have a significant impact on arid regions in southwestern North America (SWNA). In the summer of 2023, SWNA experienced u

How are Western water districts managing groundwater basins?

California Agriculture (UCANR) | March 13th, 2018

Summary

Making the transition from open-access groundwater rights to sustainable groundwater management is a formidable task for newly formed groundwater sustainability agencies

How Much Snow?

Scientific American | March 1st, 1939

Summary

Last winter, at 682 different locations in the Rockies and high Sierras, more than 30,000 exact measurements of snow depth and water content were taken, in order to e

Human emissions drive recent trends in North Pacific climate variations

Nature Portfolio (Springer Nature) | August 14th, 2025

Summary

Click here for a plain language discussion of the article by co-authors Pedro N. DiNezio and Timothy M. Shanahan

Hydraulic-Property Estimates for Use With a Transient Ground-Water Flow Model of the Death Valley Regional Ground-Water Flow System, Nevada and California

U.S. Geological Survey (USGS) | July 2nd, 2001

Summary

The Death Valley regional ground-water flow system encompasses an area of about 43,500 square kilometers in southeastern California and southern Nevada, between latitu

Hydraulic, Geochemical, and Thermal Monitoring of an Aquifer System in the Vicinity of Mammoth Lakes, Mono County, California, 2015–17

U.S. Geological Survey (USGS) | June 27th, 2019

Summary

Since 2014, the U.S. Geological Survey has been working in cooperation with the Bureau of Land Management, Mono County, Ormat Technologies, Inc., and the Mammoth Communit

Hydroclimate Report Water Year 2018

California Department of Water Resources (DWR) | March 31st, 2020

Summary

Water year (WY) 2018 whipsawed from dry to wet and added high heat for the summer. The WY ended with 82 percent of average precipitation in the Northern Sierra and 20 per

Hydroclimate Report Water Year 2019

California Department of Water Resources (DWR) | June 30th, 2020

Summary

Water year (WY) 2019 continued to demonstrate effects of climate change with greater variability and more extremes. Hydroclimate extremes presented themselves with atmosp

Hydroclimate Report Water Year 2020

California Department of Water Resources (DWR) | August 31st, 2021

Summary

Water Year (WY) 2020 continued to demonstrate the climate change narrative of greater variability and more extremes. In both precipitation and temperature, there were ne

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