People are stupid if they put wet wipes, nappies etc down their loos! We had a septic tank at our previous property, the drain to which used to get blocked very quickly if anything unsuitable was put down it, I was the poor so and so who had the job of cleaning the drain out! So as you can imagine it was made quite clear to everyone that nothing but toilet paper was flushed down it, or they had me to deal with.
When we moved to this property, which is on mains drains, thank goodness, our next door neighbour explained that they had been a problem with the previous owners who blocked the drain between our two properties on a frequent basis.
The wife always put her makeup wet wipes down the loo and grandchild's nappies! I make it my business to check the drain on a weekly basis, during the five years we have lived here, there hasn't been a problem so far, which has pleased our neighbour.