Maryborough Water Hardness & Quality Report (2026)

Maryborough's drinking water is supplied by Fraser Coast Regional Council Water, drawn from Lenthalls Dam on the Burrum River near Maryborough and supplemented by alluvial groundwater extraction from the Burrum River valley and the Wide Bay formation borefields in the Fraser Coast region of Queensland. Water hardness in Maryborough is measured at 230.5 mg/L — classified as hard, exceeding the Australian Drinking Water Guidelines (ADWG) aesthetic guideline of 200 mg/L published by NHMRC. The elevated TDS of 653.4 mg/L — and the striking contrast with co-supplied Hervey Bay (155 mg/L) from the same Lenthalls Dam — reflects the dominant groundwater component in the specific Maryborough distribution blend.

Maryborough's much harder supply compared to Hervey Bay, despite drawing from the same Lenthalls Dam source, reflects the dominant contribution of Wide Bay alluvial groundwater in the Maryborough distribution zone. The Maryborough distribution network sits closer to the inland groundwater extraction borefields, which draw from Triassic–Jurassic coastal plain sediments and carbonate-cemented alluvial formations of the Wide Bay Basin — formations where calcium and associated dissolved solids concentrate substantially more than in the surface dam supply. This groundwater-heavy blend at Maryborough produces the 230.5 mg/L hardness and very elevated TDS characteristic of the city's supply.

Maryborough residents face significant limescale accumulation on taps, shower screens, and in kettles — descaling every three to four weeks is typical. Hot water systems benefit from annual inspection and element maintenance at this hardness level. The elevated lead reading (0.004 mg/L) warrants briefly running the cold tap before use in older homes in Maryborough's extensive heritage residential streetscapes. A scale inhibitor or whole-house softener is a practical investment for protecting appliances in the historic Queensland city.