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Performing a Well Test
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Performing a well test is serious business, and careful attention is required.
Certain criteria are very important. A disclaimer should be filled out for the protection of the owner and the contractor.
Procedures: To obtain accurate results, a test should be performed for at least 4 to 6 hours (domestic wells) On larger production wells used for Municipalities and agriculture wells.
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Questions to Ask a Potential Customer Who Wants a Well Test:
- Is the property being sold?
- Who will represent the client if they are not on site?
- Is the test being performed for a government? Requirements vary for a leading agency, and often the bank or county requires a water quality as well.
- Is there a pump in the well?
- Are pumping conditions going to change, i.e.
Extended Irrigation...
Planting of Vineyards... etc.
We recommend that a bacteria test always be performed.
Why do we run a well test?
- To establish the flow rate.
- To determine water quality
- To evaluate pump performance.
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How long should the test be run?
- Domestic: Minimum 4 hours after stabilization*
* Stabilization means water level stabilized.
- Agricultural: Minimum 8 to 12 hours after stabilization*
* Stabilization means water level and GPM has stabilized (may take 24 to 48 hours or longer)
- Always take a water level recovery after the pump has been stopped.
Why should a recovery test be run?
- To establish flow rate is by measuring the time versus the quantity of the water rising in the well.
- To prove the water level when cascading water is present.
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Different types of water analysis:
- Water Analysis
- Bacteria Analysis, Certified Lab
Individual Well Set
- Total Hardness, Iron, PH, Manganese
- Specific Conductance, Nitrate N
- Bacteriological
Irrigation Well Set
- pH, Specific conductance, Total Dissolved Solids
- Iron, Boron, Sodium, Calcium, Magnesium, Total Alkalinity, Sodium
- Absorption Ratio, Calculated
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Hardness, Bacteriological
- County Certification
What observations should be made when running a test?
- Is there a storage tank on the system?
- Observe, note and log all pertinent equipment data.
- Pump HP
- S/N’s
- Voltage before and running amps
* Any other site observations that may require attention.
What responsibility does the contractor have when running a well test?
- Accuracy of reporting.
- Logging all pertinent data.
- We need to be clear about what we discuss and make no promises about the outcome of the well and the future production.
- We have a responsibility to observe all above ground equipment and report any potential problems. The customer sometimes ”expects” more than we can give them, by that I mean they assume certain items on a well test. For this reason we will report on all that we can to insure all visible equipment is inspected.
- We have a responsibility to the customer to ensure all of their needs are addressed by making sure they know what to expect from the test.
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