these costs are additional to the ongoing expenditures needed for managing water resources and providing water services in mexico in total water sector expenses are in the order of mxn billion per year two ultimate sources of finance support water policies and water services in mexico users through water resources charges and water services charges and tax payers through budgetary resources earmarked for water projects and general budgetary resources the financing mix is currently excessively supported by public budgetary resources and is not sustainable