Hi, I recently moved from Krakow to Trojmiasto with my GF and our energy bills are simply staggering, compared to what we paid in Krakow. Our use has not changed, we have the same lifestyle.
We bought a new pralka that is supposed to be very economical when it comes to water usage, we take 5-10 minutes of shower per day max, our heating is only on for a few hours per day, etc. And we live in a modern, 65 m2 appartment with double-glassed windows.
I have spoke to many people in Poland who live in apartments / flats, It seems to me that the landlords tend to charge whatever they think they will get away with, this is especially true of foreigners in Poland.
We have a house where we heat and power about 500 sqm and we pay less than 400zl a month, we do have our own well for water, but that uses electricity to pump it out.
We pay almost 200zl/month for the water alone (60% of this is the waste water charge) - however our town is one of the most expensive regarding the water fees.
200zl for water, i am in shock, that's more than in the uk, the waste cost % is crazy , I have a cesspit that costs 110zl a year to empty, I do think that people who rent property or live in flats in Poland are ripped off its criminal once you have paid 200zl for water there is no money for food if you are on polish pension/average pay.
They defrauded the money from EU for modernization of the water supply system and have been forced to repay the loan. Of course all costs were transferred on us residents...
There's no choice to change the water supplier except to move out.
This might be useful to people, bearing in mind that what counts is the number of litres you use so even though it's British, the information still applies.
ccwater.org.uk/savewaterandmoney/averagewateruse
It gives you the low, average and high figures for households of between 1 and 6 people. Also here's a water use calculator where you can put in your exact specs based on your own family's usage: bristolwater.co.uk/your-home/water-meters/water-use-calculator
Then I think if you just multiply your number of litres/cubic sq metres by the Polish water charges you should be able to roughly estimate and plan for your water bills.