We sub contract well flow rate and potability testing for a residential real estate transaction only as an additional service with a home inspection.
The Well Water Potability and Flow Rate Test does not determine if the well casing is cracked or any other component of the well is defective. The Well Water Potability test determines if Total Coloformand/or E Coli bacteria is present at the time of inspection.
A positive Total Coloform but negative E Coli result would require chlorination and then re-testing of the well which any plumber can do.
A positive Total Coloform and a positive E Coli result could indicate something more serious. going on with the well such as a cracked well casing so the proper protocol would be to have a well contractor investigate further and provide a cost estimate to correct as required.