Nollamara Water Hardness & Quality Report (2026)

Nollamara's drinking water is supplied by the Water Corporation via the Integrated Water Supply Scheme (IWSS), with dominant Gnangara Mound limestone groundwater supply for the City of Stirling LGA inner northern Perth distribution in Western Australia. Water hardness in Nollamara is measured at 211 mg/L — classified as hard, just exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Nollamara — an inner northern Perth suburb in the Stirling LGA adjacent to Balga, known for the Nollamara shopping village, the residential community of the Stirling inner northern corridor adjacent to the Mitchell Freeway, and the multicultural character of inner northern Perth — carries hard supply consistent with the broader Stirling LGA inner northern Perth IWSS distribution profile.

Nollamara's hard supply reflects the dominant Tamala Limestone groundwater contribution to the inner northern Stirling IWSS distribution. The Gnangara Mound groundwater percolates through the Superficial Aquifer and Tamala Limestone — the porous Eocene carbonate formation of the Swan Coastal Plain — where calcium carbonate and dissolved salts accumulate readily. The Nollamara inner northern Stirling distribution at 211 mg/L and TDS 593.4 mg/L is consistent with the broader Stirling LGA inner northern supply range (Balga 193.5 mg/L, Yokine 237.5 mg/L), reflecting the consistently high Gnangara Mound groundwater character of the inner northern Perth supply corridor.

Nollamara residents face daily limescale challenges — kettle descaling every one to two weeks is typical, shower screens accumulate deposits, and hot water systems require periodic inspection. Solar hot water systems in WA's sunny climate benefit from annual servicing. Under WA water restrictions, garden irrigation is limited to two days per week. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use. The Water Corporation provides water quality information at watercorporation.com.au, with all ADWG health standards met.