California American Water Prepares for Aquifer Storage and Recovery Program

Rhea-AI Summary

California American Water (AWK) prepared critical infrastructure to support the Aquifer Storage and Recovery (ASR) program in the Monterey Peninsula system ahead of the winter season.

Work includes sterilization and inspection of seasonal wells, installation or rehabilitation of column pipe, pumps, pump shafts and motors, disinfection, and installation of submersible components to maximize ASR production and water quality.

The ASR season begins on or after December 1 when Carmel River flows consistently exceed 40 cubic feet per second; once triggered, excess water is captured, treated and stored in the Seaside Basin for dry months. The system serves roughly 100,000 people with over 680 miles of pipeline and more than 100 storage tanks.

PACIFIC GROVE, Calif., Dec. 1, 2025 /PRNewswire/ -- California American Water has prepared critical infrastructure to help ensure optimal success of the Aquifer Storage and Recovery (ASR) program in its Monterey Peninsula water system. During winter storms, California American Water, along with Monterey Peninsula Water Management District, captures and treats excess rainfall from the Carmel River and stores the water for future use during dry months.

"Proactively enhancing ASR well infrastructure prepares us for the winter season," said Oliver Bell, Project Engineer, California American Water. "Without proper planning, we could potentially lose essential winter rainfall."

An important early step in ASR preparation is the sterilization and inspection of seasonal wells to maximize ASR production. This effort often includes the installation of new or rehabilitated equipment including column pipe, pump, pump shaft and motors. Equipment rehabilitation is followed by disinfection of the well along with the installation of any submersible components within the well, all of which helps to ensure optimal operation and water quality assurance.

"This process is designed to enhance the performance, efficiency and production yield of our wells," Bell continued. "The process will be completed as scheduled for the season. Supported by additional system preparations, we will be fully prepared to begin water capture once flow levels in the Carmel River meet the required thresholds."

ASR season begins on or after December 1 each year when flow levels of the Carmel River meet state-mandated levels of consistently exceeding 40 cubic feet per second. Once that flow rate is triggered, excess water can be captured and deposited into the Seaside Basin for future use. Capturing winter water when it's available is a core component of the California American Water supply strategy.

California American Water and its predecessor companies have operated the Monterey Peninsula's water system for more than 60 years. The system currently serves roughly 100,000 people with a network of over 680 miles of pipeline and over 100 storage tanks, making it one of the most complex water systems in California.

About American Water
American Water (NYSE: AWK) is the largest regulated water and wastewater utility company in the United States. With a history dating back to 1886, We Keep Life Flowing® by providing safe, clean, reliable and affordable drinking water and wastewater services to more than 14 million people with regulated operations in 14 states and on 18 military installations. American Water's 6,700 talented professionals leverage their significant expertise and the company's national size and scale to achieve excellent outcomes for the benefit of customers, employees, investors and other stakeholders.

For more information, visit amwater.com and join American Water on LinkedIn, Facebook, X and Instagram.

About California American Water
California American Water, a subsidiary of American Water, provides safe, clean, reliable and affordable water and wastewater services to approximately 750,000 people. For more information, visit www.californiaamwater.com and follow California American Water on LinkedIn, Facebook, X, and Instagram. 

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SOURCE American Water

FAQ

What ASR preparations did California American Water announce for AWK on December 1, 2025?

The company announced well sterilization and inspection, equipment installation or rehabilitation and disinfection to maximize ASR production.

When does the ASR season start for AWK's Monterey Peninsula system in 2025?

ASR season begins on or after December 1, 2025 once Carmel River flows consistently exceed 40 cubic feet per second.

How does California American Water capture winter water for AWK shareholders and customers?

During winter storms the company captures and treats excess Carmel River water and deposits it into the Seaside Basin for future use in dry months.

What infrastructure serves AWK's Monterey Peninsula water system and how many people does it serve?

The system serves about 100,000 people with over 680 miles of pipeline and more than 100 storage tanks.

Who is California American Water working with on the ASR program for AWK?

The company is working with the Monterey Peninsula Water Management District to capture, treat and store excess winter rainfall.