WML (Waterleiding Maatschappij Limburg) is the water provider of Maastricht. Most households choose to pay a fixed amount every three months based on how many people live in the house and their expected water usage. Although it is possible to buy electricity and gas services separate from one another, most providers in the Netherlands will offer discounts if you choose the same provider for both. The infrastructure provider for both electricity and gas is Enexis, but you are free to choose the actual supplier yourself. You can compare suppliers to find the one that most suits your needs.
Once you have found a supplier they will bill you an estimate of the monthly costs. This is based on the size of your household. Once a year you will be sent an annual invoice detailing your consumption of utilities. You will receive such an invoice from WML and from your utilities provider. Find all necessary information here.