While one toilet flushes w/out any problem after a good rain; the second ( which is connected to the same septic line ) won't flush for a week after dry weather returns. It's like the line is stopped up and needs to drain off excess water.
Can someone advise me on WTF is going on here?
Without many more details I can't be sure or even take a guess, there's too many other factors to consider especially if it only happens during or after a rain. But there is one possibility and I had to replace 2 toilets in 2 homes last summer for this reason alone. The problem toilet is old and just worn out. Toilets over time eventually get partially clogged inside the toilet rim or elsewhere where most of the flushing water comes from, less flushing water & slower flushing water into the bowl will cause it not to flush completely most of the time. It's the minerals in the water that stick & build up over time inside the channels of the toilet. I had one toilet that wouldn't flush completely most of the time but did every so often. It will look as of the sewer line is partially clogged because the water drains out of the bowl slower and it usually does not overflow out of the bowl onto the floor either. It may be just a coincidence that it seems to happen during or after rains.
If it's anything else other than that I would need to know more specific details on how your drain lines are installed, where they go, where they connect, how long each one is, which is the problem toilet (upstairs or downstairs), what type of sewer line is in use underground, and the sewage system in use. Hopefully someone else will have a better answer for you.
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