That is a good point about the condition of the tank.If the lid is rotted out, how good are the sides and bottom??
Yeah, what she said!Going to have to pull the hoses to the auto waterers. Back to the bucket brigade. But I can still use the hoses for several weeks, just have to drain them for the times it goes below freezing.
On of My uncles worked for a septic system company. He drove new tanks around Northern California for replacing old tanks and installing new ones.
A new tank was required by code for old tanks
Going to have to pull the hoses to the auto waterers. Back to the bucket brigade. But I can still use the hoses for several weeks, just have to drain them for the times it goes below freezing.

We do not freeze often either so have aquarium heaters in my water buckets take hoses off the house when not in use drain them
My husband just chuckled and said 'we moved here for the milder winter. If we had our druthers we would be somewhere where the winters are milder yet'. 