Wellhead Protection Program

Protect Your Drinking Water . . . Protect the Source!

What you do in and around your home or business can affect the quality of your water. Whether you are cleaning your home, maintaining your yard or changing oil in your car, there are several important ways you can help prevent pollution by adopting Best Management Practices for your Business, Farm, or at Home.

Value of Safe Drinking Water
70% of our community relies on groundwater for our drinking water needs. The following are economic benefits of source protection to a community:
  • Avoid costly treatment systems to treat contaminated drinking water
  • Avoid the cost of well replacement due to contamination
  • Avoid remediation costs required to remove a source of contamination
  • Achieve better chemical management (for businesses) and thereby reduce liability

Potential ThreatsGroundwater Protection Map

Land uses that are considered potential contaminating activities are those facilities that typically use, produce, or store contaminants, which, if managed improperly, could find their way to a drinking water source. Contaminants such as pathogens, oils, and toxic chemical compounds can reach your water supply through direct discharges above and below the land surface and through stormwater leachate and runoff.

Drinking water wells can become contaminated by activities such as dumping motor oil or household chemicals on the ground, pesticide applications, chemical leaks or spills.

What Areas Re-Charge Our Wells?

The land areas that could contribute water and pollutants to the ground water below are delineated, or mapped. These "Wellhead Protection Areas" are the surface and subsurface areas surrounding a water well through which contaminants can move toward and reach such water wells.

Wellhead Protection Overlay Zones were delineated for purposes of safeguarding ground waters that supply, or potentially supply, drinking water to wells operated by the Department of Water Supply. The Wellhead Protection Overlay Zones are divided into Zone B and Zone C based on the time it takes a drop of water to travel to the drinking water well. In Zone B it takes 2 years or less and in Zone C it takes up to 10 years travel time.

Maui County Wellhead Protection Program

The Department of Water Supply initiated the Wellhead Protection Program to protect the wells that supply drinking water to our community. Department staff identified activities that have the potential to contaminate ground water. The Department is working with landowners and stakeholders to develop and implement protection measures in delineated Wellhead Protection Areas. Protection strategies and a Draft Wellhead Protection Ordinance were developed with community input at ten public meetings throughout Maui County.
For more information about this program, contact the Water Resources and Planning Division at 463-3110.

Draft Wellhead Protection Overlay District Zones for Department of Water Supply Wells

Click on name to view map of your area.

South of Kalae Kawela Ualapue South East of Napili Kope Gulch to Iao Stream North East of Lahaina Town Iao Stream to Waikapu Kahakaloa to Waihee Kokomo - Piiholo - Awalau Keanae to Wailua Kawaipapa Gulch to Waihoi Valley