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What is the Acceptable Total Dissolved Solids (TDS) Level in Drinking Water ? For drinking water, the maximum concentration level set by EPA is 500 mg/L. Specifications: Measurement Range: 0 - 9 990ppm (>999ppm Display×10) Accuracy: ±2% F.S Power Supply: 2*1.5V (LR44 Included) Operating Temperature: 0℃ - 80℃ (32℉ - 210℉) Dimension: 162mm*29mm*15mm / 6.38"×1.14"×0.59" Weight: 45g / 1.58oz Factors Affecting TDS [High Flow Rates] Fast running water can have large-sized and more sediment. Heavy rains can pick up clay, sand, silt, and other particles like tire particles, leaves, and soil. [Soil Erosion] Soil erosion is due to the troubles on the surface of the land. It can be caused by illegal logging, forest fires, mining, and construction. The particles of an eroded soil can be carried via the stormwater into the surface water. [Urban Runoff] When the storm comes, the debris and solid particles from the commercial or residential areas can be washed away into the streams. [Rotting Animals and Plants] As animals and plants decay, ther're suspended organic particles which can be released.