Phosphates

Understanding readings in Canada

• 0.001 - 0.003 ppm - the level in uncontaminated lakes
• 0.025 - 0.01 ppm - level at which plant growth is stimulated
• 0.01 ppm - maximum acceptable to avoid accelerated eutrophication
• > 0.01 ppm - accelerated growth and consequent problems

Understanding readings in the UK

• 0.05 - 0.2 ppm - the level in uncontaminated rivers
• > 1 ppm - accelerated growth and consequent problems

Why does it matter?

While phosphate plays a very important role as a nutrient in aquatic ecosystems, it is difficult to monitor due to its low concentration and the fact that it can appear in both organic and inorganic forms. High levels of phosphates can lead to blooms of harmful algae which can hurt water quality and many lakes are monitoring levels.