The objective is to reduce the amount of municipal water the buildings use either during or after construction thus conserving the potable (drinkable) water and reducing the building’s operation costs through lower water use and sewage fees.
First step would be during the initial design phase were water consumption needs are reduced and the water used more efficiently, for example the Landscape design.
One of the main benefits of using the water efficiently is to reduce the energy used for pumping and treating water and therefor less air pollution.
Native plants that naturally grow in the same area have better survival rate than conventional ones and can be used in open spaces or on green roofs, they consume less water and pest management.
Adaptive plants although non-native plants, however, still they can adapt to the local environment and have less water consumption as well as pest management.
Try to avoid much of turf grasses that consume and waste much of the irrigation water.
Try to use drip irrigation that has efficiency of 90% and applying the water directly to the grass roots
Try to schedule the landscape watering to be during the coolest time of the day.
Graywater can be another alternative for watering landscape if filtered well, Gray water is not potable water that is offered by municipal suppliers nor it is black water that is untreated toilets and urinal water.
Indoor guidelines depends on the efficient fittings and fixtures
Avoid having leaking faucets, use dual flush and high efficiency toilets and preferably water scenes labelled.
0$ water and 0$ maintenance waterless urinals would be a good choice of fixture to be used.