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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Significant Accounting Policies [Abstract]  
Utility Plant
The following remaining lives are used for financial reporting purposes:

 
December 31
 
Approximate range
 
Utility Plant Asset Category
 
2020
  
2019
 
of remaining lives
 
Mains and accessories
 
$
212,164
  
$
200,954
 
10 – 86 years
 
Services, meters and hydrants
  
80,590
   
77,501
 
17 – 51 years
 
Operations structures, reservoirs and water tanks
  
65,617
   
63,530
 
9 – 58 years
 
Pumping and treatment equipment
  
34,163
   
33,124
 
6 – 30 years
 
Office, transportation and operating equipment
  
15,520
   
14,464
 
3 – 22 years
 
Land and other non-depreciable assets
  
3,478
   
3,393
 
 
Utility plant in service
  
411,532
   
392,966
     
Construction work in progress
  
27,138
   
8,417
 
 
Total Utility Plant
 
$
438,670
  
$
401,383
     

Regulatory Assets and Liabilities
Regulatory assets and liabilities are comprised of the following:

 
December 31
 
Remaining Recovery
 
  
2020
  
2019
 
Periods
 
Assets
        
Income taxes
 
$
28,200
  
$
24,405
 
Various
 
Postretirement benefits
  
   
365
 
-
 
Unrealized swap losses
  
2,700
   
2,227
 
1 – 9 years
 
Utility plant retirement costs
  
5,968
   
5,012
 
5 years
 
Customer-owned lead service line replacements
  
1,081
   
944
 
Various
 
Income taxes on customers’ advances for
construction and contributions in aid of
construction
  
1,815
   
998
 
Various
 
Service life study expenses
  
8
   
13
 
2 years
 
Rate case filing expenses
  
121
   
225
 
1 year
 
  
$
39,893
  
$
34,189
     
Liabilities
            
Excess accumulated deferred income
taxes on accelerated depreciation
 
$
13,826
  
$
14,008
 
Various
 
Income taxes
  
8,706
   
7,494
 
Various
 
IRS TPR catch-up deduction
  
3,412
   
3,671
 
13 years
 
Postretirement benefits
  
25
   
 
Not yet known
 
Revenue reduction for tax rate change
  
   
226
 
-
 
  
$
25,969
  
$
25,399