Highland, CA Water Use Rules: Recycled Water Rules (2026)

In the City of Highland, California, recycled water is a mandate in the water efficient landscape requirements of Highland Municipal Code § 16.40.390(J). Subsection (J)(1) requires the installation of recycled water irrigation systems, described as dual distribution systems, so that the landscape can use recycled water now and in the future. The only way out is a written exemption granted by the city engineer stating that recycled water will not be available in the foreseeable future. Subsection (J)(2) goes further and says irrigation systems shall make use of recycled water unless a written exemption has been granted stating that recycled water meeting all public health codes and standards is not available and will not be available in the foreseeable future. Subsection (J)(3) requires the recycled water irrigation systems to be designed and operated in accordance with all local agency and state codes.

The code defines recycled water as water which, as a result of treatment of waste, is suitable for a direct beneficial use or a controlled use that would not otherwise occur, and it calls that water a valuable resource. Two related rules sit in the same section. Decorative water features must use recirculating systems, and where recycled water is available it shall be the source for water features, excluding swimming pools and spas. Special landscape areas irrigated with recycled water must prepare a water efficient landscape worksheet and a landscape application under the special landscape area specifications.

The section covers public agency and private development projects and developer-installed residential projects with a total net landscape area of 2,500 square feet or more, and homeowner-installed new construction of 5,000 square feet or more, when a building or landscape permit, plan check, or design review is required. The Community Development Director or designee enforces it.