Water Conservation

Ultra-High Efficiency Toilet (UHET) Replacement Program



UPDATE: With an overwhelming response from the public to reconsider a requirement to have a certified plumber install free UHET toilets, DWS has now decided to allow single-family home owners to receive the UHET toilets with just a commitment date for installation and before/after photos.



Bathroom toilets typically account for the most indoor water use in residential households. On average, toilets accounts for approximately 25-30% of the total indoor water usage in single-family residential homes. The replacement of these older model toilets with new, ultra-high-efficiency toilets (UHET) represents a meaningful opportunity to improve water cost savings and conservation for DWS and its service customers.
Ordinance No. 2108, A Bill for an Ordinance Amending Chapter 16.20 of the Maui County Code, Pertaining to the Plumbing Code took effect on December 31, 1992. This ordinance establishes maximum rate of water flow or discharge for plumbing fixtures and devices in order to promote water conservation. These devices include faucets (kitchen & bathroom), hose bibs, showerheads, urinals, and toilets. The maximum flow for toilets under the guideline is 1.6 gallons per flush, but there are now even more efficient toilets available today.

Under the new DWS UHET Toilet Replacement Program, the public may choose to replace older qualifying toilets with new, EPA WaterSense, ultra-high-efficiency toilets (UHET) rated at 0.8 gallons per flush (gpf).
Indoor pie chart from REUWS
Restrictions apply and toilet replacements are currently only available to single-family residential DWS customers.

To read full Program Rules & Guidelines and to find out if you qualify for an UHET replacement, click the link below. Additional Questions and Answers are provided at the end of the Program Rules & Guidelines document.
To submit an application, click the link below. Selected participants will be notified via email within 1 to 2 weeks of submitting their online application.

Relevant Links:


County of Maui Landscape & Gardening Handbook


The 2011 County of Maui Landscape and Gardening Handbook was developed by the Department of Water Supply as a resource for people who want to save water in the yard and learn about what and how to plant in certain areas. It gives a wealth of information on xeriscaping, including xeriscape’s seven basic principals, list of native plants appropriate for each plant zone, and other useful resources.

County of Maui Community Gardens Project


The Department of Water Supply, along with Maui community groups, participates in an assortment of garden projects. The goal of the projects is to demonstrate the benefits of using native plants and water conservation in the landscape.
Please visit the Community Gardens Project to see some of the xeriscape and native plant gardens cultivated around Maui.

Landscape and Gardening Handbook

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Conserving Water


Please check around your property for leaks, water your yard less frequently, and use low-flow fixtures. Together we can protect our water resources.

The Department of Water Supply has some free items available to the public:
  • Shower Heads
  • Faucet Aerators for the Kitchen and Bathroom
  • Leak Detection Dye Tablets (to check toilets for leaks)
Please fill out and submit the Low Flow Fixture Data Form to receive your free items. Bring the completed form in to the
Water Resources & Planning Division at:
One Main Plaza
2200 Main Street, Suite 102
Wailuku, HI

You can also obtain this form by stopping by the office. Help us conserve water, Maui County.

Resources