Exhibit 4.23 CALIFORNIA WATER SERVICE COMPANY AMENDED AND RESTATED EIGHTH SUPPLEMENT TO NOTE AGREEMENT Dated as of May 1, 2003 Re: 5.44% $10,000,000 Series J Senior Notes Due May 1, 2018 California Water Service Company Eighth Supplement AMENDED AND...Eighth Supplement to Note Agreement • May 15th, 2003 • California Water Service Group • Water supply • California
