    <SEC-DOCUMENT>0001104659-23-043203-index.html : 20230407
    <SEC-HEADER>0001104659-23-043203.hdr.sgml : 20230407
    <ACCEPTANCE-DATETIME>20230407172512
    ACCESSION NUMBER:		0001104659-23-043203
    CONFORMED SUBMISSION TYPE:	PRE 14A
    PUBLIC DOCUMENT COUNT:		63
    FILED AS OF DATE:		20230407
    DATE AS OF CHANGE:		20230407

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			CALIFORNIA WATER SERVICE GROUP
    		CENTRAL INDEX KEY:			0001035201
    		STANDARD INDUSTRIAL CLASSIFICATION:	WATER SUPPLY [4941]
    		IRS NUMBER:				770448994
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		PRE 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-13883
    		FILM NUMBER:		23809287

    	BUSINESS ADDRESS:
    		STREET 1:		1720 N FIRST ST
    		STREET 2:		C/O CALIFORNIA WATER SERVICE CO
    		CITY:			SAN JOSE
    		STATE:			CA
    		ZIP:			95112
    		BUSINESS PHONE:		4083678200

    	MAIL ADDRESS:
    		STREET 1:		1720 FIRST ST
    		STREET 2:		C/O CALIFORNIA WATER SERVICE CO
    		CITY:			SAN JOSE
    		STATE:			CA
    		ZIP:			95112
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>PRE 14A
    <SEQUENCE>1
    <FILENAME>tm2224926-4_pre14a.htm
    <DESCRIPTION>FORM PRE 14A
    <TEXT>
    Document 1 - file: tm2224926-4_pre14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>2
    <FILENAME>cwt-20221231.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 2 - file: cwt-20221231.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>3
    <FILENAME>cwt-20221231_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE
    <TEXT>
    Document 3 - file: cwt-20221231_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>4
    <FILENAME>cwt-20221231_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
    <TEXT>
    Document 4 - file: cwt-20221231_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>5
    <FILENAME>cwt-20221231_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
    <TEXT>
    Document 5 - file: cwt-20221231_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>bc_apeps-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: bc_apeps-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>bc_apnetincome-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: bc_apnetincome-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>bc_boaexp-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: bc_boaexp-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>bc_compaptsr-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: bc_compaptsr-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>bc_officers-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: bc_officers-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>bc_women-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: bc_women-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>ic_arrowline-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: ic_arrowline-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>ic_chair-pn.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: ic_chair-pn.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>ic_chair-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: ic_chair-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>ic_cybersecurity-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: ic_cybersecurity-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>ic_date-pn.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: ic_date-pn.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>ic_financial-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: ic_financial-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>ic_health-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: ic_health-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>ic_human-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: ic_human-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>ic_industry-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: ic_industry-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>ic_location-pn.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: ic_location-pn.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>ic_member-pn.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 22 - file: ic_member-pn.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>ic_member-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 23 - file: ic_member-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>ic_public-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 24 - file: ic_public-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>ic_sustainability-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 25 - file: ic_sustainability-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>26
    <FILENAME>ic_time-pn.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 26 - file: ic_time-pn.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>27
    <FILENAME>ic_votebyinternet-pn.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 27 - file: ic_votebyinternet-pn.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>28
    <FILENAME>ic_votebymail-pn.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 28 - file: ic_votebymail-pn.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>29
    <FILENAME>ic_votebyphone7416-pn.gif
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 29 - file: ic_votebyphone7416-pn.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>30
    <FILENAME>ic_whatwedont-bw.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 30 - file: ic_whatwedont-bw.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>31
    <FILENAME>ic_whatwedont-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 31 - file: ic_whatwedont-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>32
    <FILENAME>ic_whatwedo-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 32 - file: ic_whatwedo-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>33
    <FILENAME>pc_ceoneo-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 33 - file: pc_ceoneo-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>34
    <FILENAME>pc_director-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 34 - file: pc_director-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>35
    <FILENAME>pc_divers-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 35 - file: pc_divers-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>36
    <FILENAME>pc_esg-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 36 - file: pc_esg-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>37
    <FILENAME>pc_kropelnicki-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 37 - file: pc_kropelnicki-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>38
    <FILENAME>ph_carolmpottenger-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 38 - file: ph_carolmpottenger-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>39
    <FILENAME>ph_gregoryealiff-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 39 - file: ph_gregoryealiff-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>40
    <FILENAME>ph_lesterasnow-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 40 - file: ph_lesterasnow-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>41
    <FILENAME>ph_maldonado-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 41 - file: ph_maldonado-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>42
    <FILENAME>ph_martinakropelnicki-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 42 - file: ph_martinakropelnicki-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>43
    <FILENAME>ph_patriciakwagner-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 43 - file: ph_patriciakwagner-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>44
    <FILENAME>ph_peternelson-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 44 - file: ph_peternelson-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>45
    <FILENAME>ph_river-4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 45 - file: ph_river-4clr.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>46
    <FILENAME>ph_scottlmorris-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 46 - file: ph_scottlmorris-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>47
    <FILENAME>ph_shellymesque-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 47 - file: ph_shellymesque-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>48
    <FILENAME>ph_thomasmkrummel-4c.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 48 - file: ph_thomasmkrummel-4c.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>49
    <FILENAME>sg_michellermortensen-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 49 - file: sg_michellermortensen-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>50
    <FILENAME>sg_petercnelson-bw.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 50 - file: sg_petercnelson-bw.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>51
    <FILENAME>tbl_ethdiv-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 51 - file: tbl_ethdiv-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>52
    <FILENAME>tbl_gendiv-pn.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 52 - file: tbl_gendiv-pn.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>53
    <FILENAME>px_scan01-bw.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 53 - file: px_scan01-bw.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>54
    <FILENAME>px_scan02-bw.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 54 - file: px_scan02-bw.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>55
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 55 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>56
    <FILENAME>R2.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 56 - file: R2.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>57
    <FILENAME>tm2224926-4_pre14a_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 57 - file: tm2224926-4_pre14a_htm.html

    Document 57 - RAW XML: tm2224926-4_pre14a_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>58
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 58 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>59
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 59 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>60
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 60 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>61
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 61 - file: FilingSummary.html

    Document 61 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>63
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 63 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>64
    <FILENAME>0001104659-23-043203-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 64 - file: 0001104659-23-043203-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>