California Water Service Group Promotes Tamara S. Johnson to Vice President, California Operations and Gregory D. Shimansky to Vice President, Rates and Regulatory Affairs

California Water Service Group (NYSE:CWT) promoted Tamara S. Johnson to Vice President, California Operations, and Gregory D. Shimansky to Vice President, Rates and Regulatory Affairs, effective July 1, 2026.

Rhea-AI Summary

California Water Service Group (NYSE:CWT) promoted Tamara S. Johnson to Vice President, California Operations, and Gregory D. Shimansky to Vice President, Rates and Regulatory Affairs, effective July 1, 2026.

Johnson brings 40 years of utility experience; Shimansky succeeds retiring VP Greg A. Milleman.

Argus May 21 session

-0.30% close to close Open Argus

Details

News Market Reaction – CWT

On May 21, the first trading day after this news, CWT closed 0.30% below the previous close.

Data tracked by StockTitan Argus for the May 21 session.

Market Context

This announcement highlights leadership continuity and specialization as CWT scales California opera...

Analysis

This announcement highlights leadership continuity and specialization as CWT scales California operations and navigates complex rate and regulatory frameworks. The newly created Vice President, California Operations role reflects operational growth, while the Rates and Regulatory Affairs appointment connects directly to revenue and infrastructure decisions. In context of recent CPUC approvals and ongoing capital plans, investors may watch how the new executives oversee rate design, infrastructure reliability, and long‑term regulatory engagement.

Key Figures

Effective date: July 1, 2026 Industry experience: 40 years Career start year: 1985 +2 more

Effective date

July 1, 2026

Effective date for both vice president promotions

Industry experience

40 years

Public water utility experience for Tamara S. Johnson

Career start year

1985

Johnson’s career start at California Water Service

Operator license grade

Grade 3

Water Treatment Operator License from State of California

Distribution license grade

Grade 5

Water Distribution License from State of California

Historical Context

5 past events · Latest: May 13

5 events

1. May 13

   Impact list recognition

   24h Move

   +0.3%

   Named to TIME’s inaugural World’s Most Impactful Companies list.

2. Apr 30

   CPUC rate decision

   24h Move

   +0.3%

   Final CPUC decision approving multi‑year revenue increases and investments.

3. Apr 29

   Q1 2026 results

   24h Move

   -6.9%

   Reported Q1 2026 financials and revised California general rate case details.

4. Apr 29

   Dividend declaration

   24h Move

   -6.9%

   Announced 325th consecutive quarterly dividend of $0.3350 per share.

5. Apr 14

   Top workplace award

   24h Move

   -1.0%

   Earned 2026 USA Today Top Workplaces award with additional culture accolades.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Key Terms

regulatory affairs, water treatment operator license, water distribution license

3 terms

regulatory affairs regulatory

"Vice President, Rates and Regulatory Affairs, effective July 1, 2026."

Regulatory affairs is the team and processes that secure and maintain government approvals, permits, and ongoing compliance for a company’s products, such as drugs, medical devices, or financial offerings. Think of them as the navigator and permit office that prepares submission paperwork, answers regulator questions, and monitors safety and labeling after launch. Their work matters to investors because regulatory timing, costs, and approval risk directly affect a product’s ability to reach markets and generate revenue.

water treatment operator license technical

"as well as a Water Treatment Operator License Grade 3 and a Water"

A water treatment operator license is an official certification that allows a person to run and manage public water or wastewater treatment systems, similar to a driver’s license for a car but for a treatment plant. For investors it signals that a company has qualified staff to meet regulatory standards, maintain operations, avoid fines or shutdowns, and protect revenue and asset value by ensuring safe, compliant water treatment.

water distribution license technical

"and a Water Distribution License Grade 5 from the State of California."

A water distribution license is a regulatory permit that allows a company to treat, transport and sell water to homes, businesses or municipalities. Think of it like an exclusive permission slip or franchise to operate a utility network; it matters to investors because the license creates a legal right to steady revenue, sets operating and quality obligations, and can be a major barrier to competitors or a source of regulatory risk.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SAN JOSE, Calif., May 20, 2026 (GLOBE NEWSWIRE) -- At its meeting today, the California Water Service Group (CWT: NYSE) Board of Directors unanimously approved the promotions of Tamara S. Johnson to Vice President, California Operations, and Gregory D. Shimansky to Vice President, Rates and Regulatory Affairs, effective July 1, 2026.

Prior to joining the executive team, Johnson served as Director of Field Operations, Southern California Region. She brings 40 years of public water utility experience to the position, having started her career at California Water Service, Group's largest subsidiary, in 1985. Johnson holds a Master of Business Administration from California State University, Monterey Bay, a Bachelor of Science in Business Administration from the University of La Verne, as well as a Water Treatment Operator License Grade 3 and a Water Distribution License Grade 5 from the State of California. The Vice President, California Operations role is newly created.

"This new position reflects our company's growth and the increasing complexity of water utility operations. Tammy is not only a water utility operations expert, she's also an accomplished professional with a track record of getting things done. It's truly a pleasure to welcome to the officer team someone who has dedicated her entire career to the company," said Chairman and Chief Executive Officer Martin A. Kropelnicki.

Shimansky joined California Water Service Group in 2024 as a director focused on rates and regulatory affairs outside of California. Before joining the Group, he served as Rates and Regulatory Affairs Director at Indiana American Water and General Rate Case Program Manager at San Diego Gas and Electric. He holds a Master of Science in Management from Purdue University and a Bachelor of Arts in Economics from the University of California, Los Angeles. He succeeds Greg A. Milleman, who is retiring after a distinguished 10-year career at Group.

"Greg is results-oriented, and he has done a tremendous job for us thus far. I believe he will be a real asset to the Company as we continue to pursue regulatory mechanisms and rate designs that help keep our rates affordable for customers while allowing us to make the investments in water system infrastructure that help keep our water service safe and reliable," Kropelnicki said.

About California Water Service Group

Group is the parent company of regulated utilities California Water Service, Hawaii Water Service, New Mexico Water Service, and Washington Water Service, as well as Texas Water Service, a utility holding company. Together, these companies provide regulated and non-regulated water and wastewater service to more than 2.1 million people in California, Hawaii, New Mexico, Washington, and Texas. Group’s common stock trades on the New York Stock Exchange under the symbol “CWT.” Additional information is available online at www.calwatergroup.com.

CONTACT: Shannon Dean, (408) 367-8243

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What management changes did California Water Service Group (CWT) announce on May 20, 2026?

California Water Service Group announced promotions of Tamara S. Johnson and Gregory D. Shimansky to vice president roles. According to California Water Service Group, these changes strengthen California operations and rates and regulatory affairs leadership, with both appointments effective July 1, 2026.

Who is Tamara S. Johnson and what is her new role at California Water Service Group (CWT)?

Tamara S. Johnson was promoted to Vice President, California Operations at California Water Service Group. According to California Water Service Group, she previously served as Director of Field Operations, Southern California Region, and brings 40 years of public water utility experience, including service since 1985.

What experience does Tamara S. Johnson bring to California Water Service Group’s new California Operations vice president role?

Tamara S. Johnson brings 40 years of public water utility experience to the new California Operations role. According to California Water Service Group, she holds an MBA, a BS in Business Administration, and California Water Treatment Grade 3 and Distribution Grade 5 licenses.

Who is Gregory D. Shimansky and what position was he promoted to at CWT?

Gregory D. Shimansky was promoted to Vice President, Rates and Regulatory Affairs at California Water Service Group. According to California Water Service Group, he joined in 2024 and previously held regulatory roles at Indiana American Water and San Diego Gas and Electric.

When do the new vice president appointments at California Water Service Group (CWT) take effect?

The new vice president appointments at California Water Service Group take effect July 1, 2026. According to California Water Service Group, both Tamara S. Johnson and Gregory D. Shimansky will assume their roles on that date following board approval.

Who is retiring from California Water Service Group’s leadership team and who is the successor?

Greg A. Milleman is retiring after a 10-year career at California Water Service Group. According to California Water Service Group, he is succeeded by Gregory D. Shimansky as Vice President, Rates and Regulatory Affairs, overseeing rates and regulatory affairs functions.