Leeming Water Hardness & Quality Report (2026)

Water Corporation is the entity responsible for supplying drinking water to Leeming, a suburb situated in Perth's southern region within Western Australia. This supply serves the broader City of Canning area and reaches more than 2 million residents across metropolitan Perth. The water originates from several key sources: groundwater drawn from the Jandakot Mound aquifer, surface water collected from Darling Range catchments like Mundaring Weir, and desalinated seawater processed at the Kwinana and Binningup plants. Treatment is carried out at facilities including the Kwinana Groundwater Treatment Plant and Harrisdale Advanced Water Recycling Plant, employing multi-barrier processes to meet the Australian Drinking Water Guidelines. The region's water systems are influenced by the Swan Coastal Plain and Darling Scarp catchments feeding reservoirs, with underlying aquifers such as Jandakot situated in limestone-rich strata.

The geology beneath Leeming is characterized by the Jandakot and Gnangara Mound aquifers, primarily composed of limestone and sandstone from the Quaternary and Tertiary periods. These karstic aquifers are prone to dissolving calcium and magnesium from their carbonate-rich rock during groundwater recharge. This process imbues the groundwater with a mineralized character. In the northern parts of Perth, limestone dissolution significantly impacts water hardness, but in southern suburbs like Leeming, the blending of desalinated seawater helps to soften the water's overall profile. The Superficial Aquifer lies above the Leederville and Pinjar formations, with limestone dissolution being a key factor influencing water hardness in the supply.

Homeowners in Leeming may notice the effects of moderately hard water, which can lead to limescale buildup in appliances like kettles and showerheads over time, though less severely than in areas with harder water. Regular descaling with vinegar, perhaps monthly, can help manage this, and replacing ceramic cartridges in faucets every six to twelve months is also beneficial. Spotting on glassware from dishwashers or coffee machines might occur, but using a rinse aid can mitigate this issue. While a water softener isn't strictly necessary for the functionality of appliances, some residents may opt for one to address aesthetic preferences. Water Corporation confirms consistent compliance with drinking water guidelines, reporting typical pH levels between 7.2 and 8.0 and effective chlorine residuals, with no significant lead or copper issues detected in distribution sampling.