It sounds like you are trying to determine if you have a $270 job, how much of that $270 will be profit vs. utility expenses?
For the water utility - Do you know around how much you pay per gallon? I know I am billed per thousand gallons around $2.16 per thousand gallon up to 4000 and around $3 over 6500 gallons and I am billed bi-monthly. You may need to do some math with it if you really want to get an idea or understanding of what your cost would be per job depending on estimating how much water (gallons) you are using per job? It seems like a pretty small trivial number when i calculate my per gallon cost based on what I am paying per 1000 gallons. I mean other than that I agree with the above just throw a ball park $3 to $5(high side) on it and make it simple for yourself. At the end of the day though if you arent showing it as a business expense on your taxes you probably don't need to get too into it and complicate it.
In terms of what you are charging that's really your decision based on the amount of time you spend on a vehicle and the quality of your work. If you can find friends, family, strangers etc to pay those prices then good on you.
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