Honestly, besides using shower water for the toilets (house has 3 toilets), my water usage has not changed much. I don't have a garden, only a palm tree which does not require water, a koi pond with some plants around it, and two tree ferns. No grass. Household of 2.How much water did you use in January 2017 compared to January 2018? I guess less than 6kl going by your post, how about other larger households in the CoCT?
EDIT: I live in a complex. Probably makes a difference, but so many people live in complexes as well these days.