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Fair Value Measurement
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurement Fair Value Measurement
The following instruments are not measured at fair value on SJW Group’s condensed consolidated balance sheets as of March 31, 2021, but require disclosure of their fair values: cash and cash equivalents, accounts receivable and accounts payable. The estimated fair value of such instruments as of March 31, 2021, approximates their carrying value as reported on the condensed consolidated balance sheets. The fair value of such financial instruments are determined using the income approach based on the present value of estimated future cash flows. There have been no changes in valuation techniques during the three months ended March 31, 2021. The fair value of these instruments would be categorized as Level 2 in the fair value hierarchy, with the exception of cash and cash equivalents, which would be categorized as Level 1.
The fair value of SJW Group’s long-term debt was approximately $1,486,355 and $1,570,727 as of March 31, 2021, and December 31, 2020, respectively, and was determined using a discounted cash flow analysis, based on the current rates for similar financial instruments of the same duration and creditworthiness of the company. The book value of long-term debt was $1,379,313 and $1,363,821 as of March 31, 2021, and December 31, 2020, respectively. The fair value of long-term debt would be categorized as Level 2 in the fair value hierarchy.
The following tables summarize the fair values of the Rabbi Trust investment assets to fund CTWS’s additional retirement benefits under the supplemental executive retirement plans and retirement contracts by major categories as of March 31, 2021, and December 31, 2020: 
 Fair Value Measurements at March 31, 2021
Asset CategoryTotalQuoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
Significant
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Money market funds$145 145 — — 
Mutual funds2,034 2,034 — — 
Fixed income830 830 — — 
Total$3,009 3,009 — — 
 Fair Value Measurements at December 31, 2020
Asset CategoryTotalQuoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)
Significant
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Money market funds$83 83 — — 
Mutual funds2,101 2,101 — — 
Fixed income830 830 — — 
Total$3,014 3,014 — —