Assuming each household will ...

Assuming each household will use about 500 liters per day, you need about 75 m3/day.  It would be interesting to know what their current water source is - are they carrying water from the proposed source, or is there a closer spring that is insufficient, or are they collecting rainwater.  An option is always to carry out a detailed rainwater collection programme such that each household has sufficient storage to carry them over the dry months during a 1:10 year drought.  If the rainfall or roof area is insufficient, consider designing household storage to provide at least 100 liters per day for drinking and cooking.  This would reduce the requirements for the high cost pumped supply.  A grey water recycling system could also be considered to further reduce the need for pumped water.  Ultimately though you will need to pump some of the water.  Because of the very high head it is advisable to pump in stages (say 3 to 5), and power from the available electric cable may be the most economical and sustainable solution.