Water Utility - Treatment Plant Depreciation at Regulatory Rates
Recording depreciation on a water treatment plant at the state PUC or municipal rate authority-approved depreciation rates, with a regulatory treatment that mirrors electric utility plant accounting.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Depreciation Expense - Water Treatment Plant | Expense (+) | 4,850,000.00 | - |
| Accumulated Depreciation - Water Treatment Plant | Asset (-) | - | 4,850,000.00 |
💡 Accountant's Note
Investor-owned water utilities (regulated by state PUC) follow the same rate-regulated accounting framework as electric utilities — NARUC (National Association of Regulatory Utility Commissioners) Uniform System of Accounts for water utilities governs account classifications. Depreciation rates are PUC-approved based on independent depreciation studies. The rate base for water rate cases includes water treatment plants, transmission/distribution mains, wells, pumping stations, storage tanks, and service lines — subject to the same ADIT offset as electric utilities.
Practitioner & Systems Framework
💻 ERP Architecture
NARUC Uniform System of Accounts for Water Utilities (10 CFR Part 104 for FERC jurisdictional, or state PUC equivalents) specifies account structure: Intangible Plant (301-303), Source of Supply (311-315), Pumping Plant (321-325), Water Treatment (331-335), Transmission and Distribution (341-348), General Plant (361-397). Water utility plant accounts parallel electric utility accounts in structure.
⚠️ Audit Flags
Water utility audits focus heavily on source-to-delivery reconciliation — physical water loss (non-revenue water) often represents 15–25% of pumped water and indicates leakage or metering issues. Plant additions must be traced to capital project completion records. Source water rights (well permits, surface water rights) are property rights that must be separately tracked.
📄 Required Documentation
PUC-approved depreciation study (NARUC accounts), plant addition records, depreciation schedule by NARUC account, water loss (non-revenue water) tracking, source water rights documentation, NARUC water utility Form W financial reporting.
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