Mountain Creek Water Hardness & Quality Report (2026)

Mountain Creek's drinking water is supplied by Unitywater as water retailer, with bulk supply from Seqwater drawing from Lake Baroon Dam (Mary River) and Lockyer Valley groundwater supplementation through the south-east Queensland water grid for the Sunshine Coast Regional Council LGA distribution in Queensland. Water hardness in Mountain Creek is measured at 178 mg/L — classified as moderately hard — within the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. Mountain Creek — a large southern Sunshine Coast suburban community adjacent to Mooloolaba and Maroochydore, known for the Mountain Creek State High School community, the Cotton Tree Park and Mooloolah River Parklands recreational corridor, the Sunshine Coast's major commercial and tourism hub of the Maroochydore City Centre, and the established Sunshine Coast residential community of the inner Maroochydore-Mooloolaba corridor — receives moderately hard supply reflecting a lower Lockyer Valley groundwater proportion than the harder inland Sunshine Coast sub-zones.

Mountain Creek's moderately hard supply reflects a moderately lower Lockyer Valley groundwater proportion in the Sunshine Coast Unitywater SEQ supply blend at this sub-zone compared to the harder inland Nambour sub-zone (247 mg/L). The Lake Baroon Dam supply from the Mary River volcanic and metamorphic terrain (Great Dividing Range) provides a lower-mineralisation component — blended with Lockyer Valley groundwater percolating through mineralised Jurassic–Cretaceous carbonate Darling Downs formations. At 178 mg/L and TDS 401.9 mg/L, Mountain Creek's supply is moderately hard but considerably softer than the harder inland Sunshine Coast sub-zones, reflecting greater Lake Baroon surface water proportion.

Mountain Creek residents face moderate limescale on taps and in kettles — descaling every four to six weeks is typical. Hot water systems benefit from regular inspection. The very low lead reading (0.001 mg/L) is excellent. Under Queensland water restrictions, outdoor watering is regulated. Unitywater provides water quality data online, with all ADWG health standards consistently met. Mountain Creek's Mooloolah River parklands and the Maroochydore coastal community benefit from supply meeting all ADWG safe drinking standards.