Mundaring

As of October 5, 2026, Mundaring is filled to 43.0% of its total capacity, holding roughly 27 hm³ of water out of a maximum 64 hm³. At this level the reservoir is within its normal operating range. Of that total, about 57 hm³ is usable (live) storage.

Over the most recent week on record the fill level has held broadly steady (+0.1 pts), and it is 13.5 points below its level on the same date a year earlier.

Across the readings we hold for Mundaring — 1057 data points between October 9, 2023 and October 5, 2026 — the level has ranged from a low of 33.2% (May 22, 2025) to a high of 65.1% (October 9, 2023). On average the reservoir is fullest around October and at its lowest around May.

The dam at Mundaring was completed in 1902. It is operated by BOM primarily for water supply. It lies within the Helena River Basin basin at 31.987°S, 116.214°E.