The law will not enforce an illegal contract or agreement. If the pumping of sewage into the lagoon is against the law, then the easement cannot be enforced and you did not lose a compensable "right".
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You will need to have an attorney review the facts in your particular case. If you have a deeded right you may go to court and enforce your rights , however if the right you are granted is against public policy, such as dumping raw sewage your utility easement may have to conform to current standards.
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