Hi, Charlie, here attached ...

Hi, Charlie,
here attached you can find quite recent literature about the "Product Liability Law" in Nigeria.
The judicial system is pretty different from western countries in that the judge in charge decides practically on his own based on the evidence and information presented to him.
Based on your description of the facts, I am personally of the opinion that the company that carried out the work must take full responsibility and bear all the costs of the new drilling or this company can blame the local community water manager for the collapse.
Good luck with your project!

Best regards

Duilio