The routine hosing of sidewalks, driveways, loading docks and parking lots not only wastes water, but increases pollution and contamination of water supplies by conveying debris and chemicals into bodies of water. Washing or hosing outdoor hard surfaces is prohibited in many municipalities.

If the washing of outdoor areas is required for public health or other reasons, power washers should be used since they use considerably less water than conventional hoses and nozzles.

In some areas of the country, rainwater collection or integrated greywater systems can be used to supply water for washing sidewalks and driveways as well as for irrigation and washing vehicles. Check with your local municipality regarding codes.

Resources:

The Public Works Department of the City of Modesto, CA runs this excellent water conservation page called “Be a Wiser Water Miser.” It is designed primarily for residents, but the information is also useful for commercial users.