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Capitalization | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Capitalization | Capitalization SJW Group is authorized to issue 70,000,000 shares of common stock of $0.001 par value per share. At December 31, 2021 and 2020, 30,181,348 and 28,556,605, respectively, shares of common stock were issued and outstanding. As of December 31, 2021 and 2020, 1,000,000 shares of preferred stock of $0.001 par value per share were authorized for SJW Group. At December 31, 2021 and 2020, no shares of preferred stock were issued or outstanding. On March 8, 2021, SJW Group entered into an underwriting agreement with J.P. Morgan Securities LLC, as the representative of the several underwriters named therein (the “Underwriters”), which provided for the issuance and sale by SJW Group to the Underwriters 1,030,000 shares of common stock, par value $0.001 per share, in an underwritten public offering (the “Offering”). The shares in the Offering were sold at a public offering price of $59.00 per share. SJW Group also granted the Underwriters an option to purchase up to 154,500 additional shares of common stock, which was exercised in full. The Offering closed on March 11, 2021, and the offering of option shares closed on March 16, 2021. SJW Group received net proceeds of approximately $66,775 from the Offering and the sale of option shares, after deducting the underwriting discounts and commissions and offering expenses. SJW Group used the proceeds from the offerings to pay down a bank line of credit agreement, dated as of June 1, 2016, between SJWC and JPMorgan Chase Bank, N.A. and for general corporate purposes, which included, among other things, financing infrastructure improvements and other capital expenditures, repayment of debt or other corporate obligations and working capital. On November 17, 2021, SJW Group entered into an equity distribution agreement (the “Equity Distribution Agreement”) with J.P. Morgan Securities LLC, Janney Montgomery Scott LLC, RBC Capital Markets, LLC and Wells Fargo Securities, LLC (each a “Sales Agent” and, collectively, the “Sales Agents”), pursuant to which the Company may offer and sell shares of its common stock, $0.001 par value per share (the “Shares”), from time to time in “at-the-market” offerings, having an aggregate gross sales price of up to $100,000 (the “Offering”). Pursuant to the Equity Distribution Agreement, the Shares may be offered and sold through the Sales Agents in transactions that are deemed to be “at-the-market” offerings as defined in Rule 415 under the Securities Act of 1933, as amended, including sales by means of ordinary brokers’ transactions on the New York Stock Exchange or otherwise at market prices prevailing at the time of sale, at prices related to the prevailing market prices or at negotiated prices, in block transactions, or as otherwise agreed upon by the Company and the Sales Agents. Proceeds from the sale of the shares under the Equity Distribution Agreement can be used in the financing of acquisitions, including the acquisition of the Kendall West and Bandera East utilities in Texas, infrastructure improvements and other capital expenditures, repayment of debt or other corporate obligations, and working capital over the term of the Equity Distribution Agreement as such needs arise. SJW Group issued and sold a total of 355,115 shares of common stock with a weighted average price of $70.40 per share and received approximately $24,253 in net proceeds under the Equity Distribution Agreement during the year ended December 31, 2021.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496180-112644 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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