Landlord hiding fees in water and sewage

[Jacob Bowman]

So my landlords sent a notice to everyone that is on a month to month lease that their rent will be going up by 100$ per month. However being I am on a 1 year lease at an agreed price I should be exempt from this raise. 

Onto my main point now, my water bill and sewage bill is a constant rate that changes every 6 months. I am 3 months into my current 6 month period for water and sewage and I noticed that my water bill went up exactly 50$ and my sewage bill went up exactly 50$ so obviously they are hiding a rent hike in my Bill's. They also dont include usage on the bill they just give a dollar amount. 

What can I do about this? It's really sketchy.