Details

Last Updated: Thursday, 16 May 2024 12:01

Water hardness levels are monitored on a regular basis by Laboratory Services and reported as mg/L (milligrams per litre) of calcium carbonate. The water pressure zone map below and pressure zone/water hardness list is to be used in conjunction with the water hardness calculator to determine the correct setting required for certain appliances e.g. dishwashers.

Toowoomba City Pressure Zone Hardness

• City: 188 mg/L calcium carbonate
• Freneau Pines: 85 mg/L calcium carbonate
• Gabbinbar: 78 mg/L calcium carbonate
• Gabbinbar High: 78 mg/L calcium carbonate
• Horners: 180 mg/L calcium carbonate
• Kynoch: 78 mg/L calcium carbonate
• Lofty: 79 mg/L calcium carbonate
• Northern: 188 mg/L calcium carbonate
• Picnic Point: 109 mg/L calcium carbonate
• Platz North: 84 mg/L calcium carbonate
• Platz South: 84 mg/L calcium carbonate 

Toowoomba Regional Council - Regional Areas

• Toowoomba Bulk Supply: 78mg/L calcium carbonate
• Includes: 
  • Jondaryan
  • Kingsthorpe
  • Gowrie Mountain
  • Gowrie Junction
  • Oakey
  • Goombungee                  
  • Meringandan West
  • Highfields
  • Hodgson Vale
  • Wyreema
  • Westbrook
• Cambooya: 36 mg/L calcium carbonate
• Greenmount: 198 mg/L calcium carbonate
• Vale View: 20 mg/L calcium carbonate.
• Clifton: 45 mg/L calcium carbonate
• Nobby: 39 mg/L calcium carbonate
• Pittsworth (including Southbrook, Brookstead and Yarranlea): 264 mg/L calcium carbonate.
• Millmerran: 198 mg/L calcium carbonate
• Cecil Plains: 87 mg/L calcium carbonate
• Haden: 601 mg/L calcium carbonate
• Yarraman: 188 mg/L calcium carbonate
• Crows Nest: 78 mg/L calcium carbonate
• Hampton: 76 mg/L calcium carbonate

This is used for determining water hardness in dishwashers etc.

To convert this reading to that required in dishwasher setup literature multiply the hardness of water in mg/L x the conversion factor in the required units.

• Alkaline Earth Ions mmol/L: 0.01
• Alkaline Earth Ions m.equiv/L: 0.020
• ppm CaCO3: 1.00
• German Degrees ^od or ^od H: 0.056
• English Degrees ^oe: 0.07
• French Degrees ^of: 0.100

For example: if hardness in mg/L equals 124mg/L and a dishwasher setting required the value in German Degrees (⁰d), the calculation would be 124mg/L x 0.056 = 6.9 ⁰d