Ultra-High Efficiency Toilet Replacement Program

Update: With an overwhelming response from the public to reconsider a requirement to have a certified plumber install free Ultra-High-Efficiency Toilet (UHET) Replacement Program, DWS has now decided to allow single-family homeowners to receive the UHET with just a commitment date for installation and before/after photos.

Bathroom Toilets

Bathroom toilets typically account for the most indoor water use in residential households. On average, toilets account for approximately 25 to 30% of the total indoor water usage in single-family residential homes. The replacement of these older model toilets with new, UHET represents a meaningful opportunity to improve water cost savings and conservation for DWS and its service customers.

Plumbing Code

Ordinance Number 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 a maximum rate of water flow or discharges for plumbing fixtures and devices in order to promote water conservation. These devices include:

  • Faucets (kitchen and bathroom)
  • Hose bibs
  • Showerheads
  • Urinals
  • 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.

Graph of Water Usage in a Household (PNG)

Under the new DWS UHET Toilet Replacement Program, the public may choose to replace older qualifying toilets with new, Environmental Protection Agency (EPA) WaterSense, ultra-high-efficiency toilets (UHET) rated at 0.8 gallons per flush (gpf).

Restrictions Apply

Restrictions apply and toilet replacements are currently only available to single-family residential DWS customers.

Qualifying for a UHET Replacement

Read the full Program Rules and Guidelines (PDF) to find out if you qualify for a UHET replacement. Additional Questions and Answers are provided at the end of the Program Rules and Guidelines document.


Submit an application. Selected participants will be notified via email within 1 to 2 weeks of submitting their online application.