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GENERAL (Details) gal in Millions |  | 3 Months Ended
--- | --- | ---
Jan. 27, 2017 gal / d mi gal | Mar. 31, 2018 gal / d Subsidiary Facility WaterSystem Squarefeet Customer
Number of wholly owned subsidiaries | Subsidiary |  | 9
Number of subsidiaries not regulated | Subsidiary |  | 4
Artesian Development purchased area of office space (in square feet) | Squarefeet |  | 10,000
Artesian Development purchased area of warehouse space (in square feet) | Squarefeet |  | 10,000
Artesian Wastewater [Member] |  |
Number of wastewater treatment facilities owned and operated | Facility |  | 4
Capacity of wastewater treatment facilities |  | 500,000
Allen Harim Foods, LLC [Member] |  |
Capacity of wastewater treatment facilities | 1,500,000 |
Approximate pipeline mileage | mi | 8 |
Volume of storage lagoon | gal | 90 |
Artesian Water Maryland [Member] |  |
Number of public water systems owned and operated | WaterSystem |  | 8
Maximum supply amount of water per day |  | 1,000,000
Artesian Utility [Member] |  |
Initial contract period of operating wastewater treatment facilities in Middletown |  | 20 years
Number of wastewater treatment station facility operations in Middletown | Facility |  | 2
Number of wastewater treatment facilities in Middletown providing reclaimed wastewater | Facility |  | 1
Number of water service line protection plan customers | Customer |  | 19,500
Number of sewer service line protection plan customers | Customer |  | 15,400
Percentage of water service line protection plan customers signed up |  | 24.50%
Percentage of sewer service protection plan customers signed up |  | 19.40%
Percentage of internal service protection plan eligible customers signed up |  | 6.10%
Number of internal service line protection plan customers | Customer |  | 4,900
Number of non customers signed up with plan | Customer |  | 1,600
Artesian Utility [Member] | Wastewater treatment facility first of two [Member] | Maximum [Member] |  |
Capacity of wastewater treatment facilities |  | 2,500,000
Artesian Utility [Member] | Wastewater treatment facility second of two [Member] | Maximum [Member] |  |
Capacity of wastewater treatment facilities |  | 250,000

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