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Long-Term Water Assets - Volume of Water Assets (Details) - acre ft | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2009 | Dec. 31, 2008
--- | --- | --- | --- | ---
Banked water and water for future delivery |  |  |  |
Water contracts and purchased water | 10,137,000 | 10,137,000 |  |
Total purchased water contracts | 85,784,000 | 83,980,000 |  |
Total purchased and contracted water sources in acre feet | 142,132,000 | 133,306,000 |  |
AVEK water bank |  |  |  |
Banked water and water for future delivery |  |  |  |
AVEK water bank | 13,033,000 | 13,033,000 | 6,393 | 8,393
Company water bank | 37,316,000 | 35,793,000 |  |
Transferable water | 5,999,000 | 500,000 |  |
Banked water and water for future delivery | 56,348,000 | 49,326,000 |  |
WRMWSD - Contracts with Company |  |  |  |
Banked water and water for future delivery |  |  |  |
Water contracts and purchased water | 15,547,000 | 15,547,000 |  |
Tejon-Castac Water District |  |  |  |
Banked water and water for future delivery |  |  |  |
Banked water and water for future delivery | 54,351,000 | 52,547,000 |  |
Water contracts and purchased water | 5,749,000 | 5,749,000 |  |

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