Quick Answer
To test water quality from a buried cistern, collect a sample from the cistern and use a multi-parameter water testing kit to check pH, turbidity, total dissolved solids, and bacteria levels. The kit should include a pH meter, turbidity meter, and water testing strips for bacteria and other contaminants. Compare the results to local or national water quality standards.
Collecting a Sample
When collecting a sample from the cistern, use a sanitized sampling container and a clean scoop or dipper to minimize contamination. Collect at least 1 liter of water from a depth of 1-2 meters below the surface. If the cistern is buried under a concrete slab, remove the slab’s cover or use a sampling port to access the water.
Water Testing
Use a multi-parameter water testing kit to analyze the pH, turbidity, total dissolved solids, and bacteria levels in the sample. The pH meter should be calibrated before use and can be purchased at a local hardware store or online. For turbidity, use a nephelometric turbidity meter or a turbidity tube. Add water testing strips for bacteria and other contaminants, following the manufacturer’s instructions.
Interpreting Results
Compare the test results to local or national water quality standards. For example, the World Health Organization recommends a maximum pH range of 6.5-8.5, a turbidity of less than 5 NTU (nephelometric turbidity units), and a total dissolved solids level of less than 1000 mg/L. If the results indicate contamination or poor water quality, consider disinfecting the cistern, replacing the water, or using a water treatment system.
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