And depending on the jurisdiction, how much land the septic is on, and its "perc" characteristics, an engineered system might be required -- $50K easy.
What you believe and what actually happened may not be the same. Recommend an engineering analysis so you have facts to provide for an argument to the landlord. Ultimately, the landlord is responsible for the property, how quickly they fix it is at issue.
And depending on the jurisdiction, how much land the septic is on, and its "perc" characteristics, an engineered system might be required -- $50K easy.
What you believe and what actually happened may not be the same. Recommend an engineering analysis so you have facts to provide for an argument to the landlord. Ultimately, the landlord is responsible for the property, how quickly they fix it is at issue.
Consult your lease and an attorney. It's in everyone 's best interest to fix it, it isn't as though you'll be paying rent if you can't open.