When you turn on your tap and see discoloured water flowing from your bore, it can be concerning. Understanding the factors that influence water colour can help you identify potential issues and maintain a healthy water supply. Let's dive into the main culprits behind water discolouration in bore systems.
1. Mineral Content
Iron
Reddish-brown colour: High iron content is one of the most common causes of water discolouration.
Orange stains: You might notice these on fixtures and laundry.
Manganese
Black or dark brown tint: Often accompanies iron but can occur independently.
Tea-coloured water: In lower concentrations, manganese can give water a tea-like appearance.
2. Sediment and Particulates
Cloudy or muddy appearance: This can be due to sand, silt, or clay particles in the water.
Varying colours: Depending on the type of sediment, the water might appear brown, red, or grey.
3. Organic Matter
Yellow or brown tint: Tannins from decaying vegetation can seep into groundwater.
Earthy odour: Often accompanies the discolouration caused by organic matter.
4. Bacteria
Slimy texture: Some bacteria can create a biofilm, affecting both colour and texture.
Reddish or brown slime: Iron bacteria, in particular, can cause this issue.
5. pH Levels
Blue-green tint: In rare cases, extremely alkaline water can cause this colouration.
Corrosion effects: pH imbalances can lead to the leaching of metals from pipes, indirectly affecting colour.
6. Bore Depth and Aquifer Characteristics
Varying mineral content: Deeper bores might tap into aquifers with different mineral compositions.
Seasonal changes: Shallow bores are more susceptible to changes in water table and runoff influences.
7. Recent Bore Work or Disturbances
Temporary discolouration: Drilling, maintenance, or nearby construction can stir up sediments.
Flushing period: It may take time for the water to clear after such disturbances.
Conclusion
The colour of your bore water can be a valuable indicator of its quality and potential issues within your water system. While some discolouration may be harmless, it's always wise to have your water tested regularly, especially if you notice sudden changes in colour, taste, or odour.
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