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Wahikuli Subdivision Gravity Sewer Design Project

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Last updated October 2025

Wastewater

Wahikuli Subdivision Gravity Sewer Design Project

The Final Environmental Assessment for the Wahikuli Subdivision Gravity Sewer System Project was issued and can be accessed in the July 8, 2025, State of Hawaii Office of Planning and Sustainable Development Environmental Review Program’s The Environmental Notice website.

  1. Final Environmental Assessment and Finding of No Significant Impact (pdf)
  2. Appendices (pdf)

The Finding of No Significant Impact for the Wahikuli Subdivision Gravity Sewer System (pdf) (293.18 KB, June 12, 2025) was signed by EPA on June 12, 2025. EPA plans to discuss the current project status at the August 13, 2025, Lahaina Community Meeting.

The scope of work for this project includes:

  1. Conducting an environmental review, including cultural and biological consultations, and seeking public input on the proposed project.
  2. Drafting pre-construction design, with public input opportunities, and engineering plans.
  3. Holding regular meetings with the County of Maui and providing periodic public updates.

                                                   

This initiative comes in response to a request from the County of Maui for Federal Emergency Management Agency (FEMA) technical assistance. Through FEMA funding, EPA was asked to provide support with planning and designing a proposed gravity sewer system for the Wahikuli subdivision, which comprises approximately 230 properties currently serviced by individual wastewater systems, including cesspools and septic systems.

Proposed Sewer Lateral and Request to Change Location

The sewer design is not yet complete. 60% designs are due on November 7th. We have developed a site plan to show where the sewer lines will run and anticipated sewer lateral connection points.  The latest site plan associated with the 30% designs was shared at the August 13th and September 9th community meetings. The site plan is color coded red, yellow and green to indicate the likely sewer connection method.

View Site Plan (PDF)View Plan (PDF)

Green properties are expected to be gravity fed, yellow may use easements in the back of their property, and red are likely to need a grinder pump, depending on the structure and its internal plumbing.

Preliminary locational coordinates associated with the 30% design are available to better identify where the proposed lateral will be on your property. Lateral locations were carefully planned to minimize conflicts with existing site features such as trees, paved driveways, retaining walls, and underground utilities, wherever possible.  However, due to site limitations, some conflicts will be unavoidable.

There is a short window for homeowner to review the proposed lateral location and request a change

Review and Comment by 12 p.m. on Wed, Oct. 8

By noon on Wednesday, October 8th, homeowners are encouraged to review and comment on the proposed lateral location if there is an issue identified. The location of the lateral may be moved if there are no limiting factors. The information in these graphics is the best current available but may change as the design progresses.

If you want to request a change in location of your lateral, contact Rommel Yanos at rommel.yanos@co.maui.hi.us, Kate Rao at rao.kate@epa.gov, Sarah Pedroza at pedroza.sarah@epa.gov, and Samantha Bishop at bishop.samantha@epa.gov in writing with a clear description of where you want to move the lateral.  You, or your consultant/engineer, can attach a hand written sketch to help clarify the request.  The sketch does not need to be to scale.

We will confirm in writing as soon as we can if your request is feasible.  If it is not, we will provide the rationale that the change cannot be incorporated into the designs.

Please do not contact the County or EPA if you are not requesting a change in location of the lateral. If you have already requested a change in writing, we will confirm receipt and inform you of the decision in November. If for any reason you were not able to provide feedback on your lateral placement during the design-phase, there may be an additional opportunity in the construction-phase to inform the lateral placement.

FAQs on Wahikuli Sewer Project

CONNECTING TO THE NEW SEWER SYSTEM:

Once the County sewer is built, what do I have to do to connect to the County sewer?

If the sewer line fronts a property, the owner must connect to the sewer line. A homeowner needs a plumbing permit from the Department of Public Works, Development Services Administration (DPW, DSA) to connect to the sewer within 180 days (about 6 months) of the date of the County letter notifying the homeowner of sewer connection availability. A plumbing inspection will also need to be scheduled. Please refer to State law HAR 11-62-06(b) and Maui County Code Section 14.21A.010 - Required connection. For more information on a lot-by-lot basis, please contact the WWRD (808-270-7417). The County sewer is currently being designed, inclusive of laterals from the main sewer line to within 2 feet of each property line. If constructed in this fashion, once the lateral is built, you will connect at the cleanout at your property line. 

What steps can I take today to connect to the future county sewer?

The sewer design is not yet complete. Please see the information graphics and site plan from DEM on possible sewer connections to determine if your property will likely have a gravity-fed connection to the County’s sewer main line. The information in these graphics is the best currently available, but it may change as the design progresses.

What happens to my cesspool after I connect?

Homeowners should decommission their cesspool by having all organic material removed by a licensed hauler and disposed of properly, collapsing the cesspool cover, and using like material to fill it. Fill soil should be placed in layers (lifts) with each layer compacted before adding the next. Fill should be packed down, so no depression or tripping hazards are present. Please refer to the DOH protocol on mauirecovers.org, titled “Guidance for Wahikuli (PDF),” accessible via the link here.

Do homeowners who built an interim septic system need to connect to the county sewer once it is constructed?

All owners serviceable by the County of Maui Department of Environmental Management (DEM) Wastewater Reclamation Division (WWRD) sewer system must connect within 180 days of the County letter notifying the homeowner of sewer connection availability. For more information, please refer to State law HAR 11-62-06(b) and Maui County Code Section 14.21A.010 - Required connection. Property owners may also request an extension to the 180days by submitting a request letter to the Director of DEM containing justification for an extension. Each request will be reviewed on a case-by-case basis and application does not guarantee an extension. 

How do I know where the sewer line will run near my property?

Please see the informational graphics and site plan from DEM on possible sewer connections to determine where the sewer line will be concerning your property – this will help determine if you connect via gravity line, grinder pump, or easement. The information in these graphics is the best current available, but may change as the design progresses. Non-standard properties or structures may require an easement or grinder-pump to connect to the County sewer. Some properties may benefit from an existing sewer easement that may be dedicated to the County. Owners may not build or place any structures on the easement. 

I live on Fleming Road. What does this mean for the sewer connection?

The US Army Corps of Engineers constructed a gravity sewer system along Fleming Rd to service the Kilohana Temporary Housing project. This sewer project includes installing sewer laterals for each lot within the construction area. If the sewer line currently fronts a property, the owner must connect to the sewer line within 180 days of the date of the County letter notifying the property owner of sewer connection availability. A homeowner needs a plumbing permit to install the sewer lateral, service cleanout, and connect to the Fleming Rd sewer. If you have questions about a specific lot on Fleming Rd, please contact the WWRD (808-270-7417). A hold will prevent additional permitting if the proper service cleanout is not relocated or installed.

What is the timeline for the proposed sewer system?

The sewer design process is scheduled to be complete in Spring 2026. The ultimate timeline for construction depends on the availability and procurement of construction funds. Once construction funding and a contract are secured, projects are generally given from 365 to 730 calendar days from notice to proceed to completion.

PERMITTING:

How will the proposed sewer system impact my permitting and rebuilding process?

Provisions should be made to the interior premise plumbing system and stub-out on the property to tie-in to the County sewer system using the best information on the sewer design available at this time - please see informational graphics from DEM on possible sewer connection scenarios.

I’ve made decisions for my internal plumbing, including locating my sewer connection stub for my permitted rebuild. Will this inform the design process?

WWRD will record the sewer stub location and provide it to the contractors working on the County’s sewer design. If you have already rebuilt or are planning to rebuild and will stub out for a future sewer connection, please inform WWRD of your stub-out location, as it could potentially inform the sewer design. Information provided to the contractors before August 1st, 2025, will likely be incorporated into the design.

EASEMENTS:

What is an easement and how do I determine if there’s one on my property?

A sewer easement is a legal agreement that grants a public entity, like a city or utility company, the right to access and use a portion of private property for sewer maintenance and repairs. This means the County can access the area to fix or maintain the sewer lines, without requiring additional permission each time. Property owners are not allowed to  build structures that would interfere with access to and within the easement. More information about easements for residents will be forthcoming as sewer designs progress.

Can my next-door neighbor and I share a common trench for our private sewer laterals?

Yes, but first, a private sewer easement must be established, and the easement document must be recorded with the County of Maui. A copy of that easement document must be provided to the County of Maui Department of Environmental Management
(DEM) Wastewater Reclamation Division (WWRD) before a sewer connection permit is issued. DEM has no plans to approve a double service lateral that services two properties, each property is expected to have an independent private sewer lateral and service cleanout.

GENERAL:

When will the sewer system design be released or available to the Wahikuli community?

The EPA plans to discuss the draft environmental assessment for the Wahikuli sewer project at the May 7th Maui Community meeting. As the design progresses, information will be released at future community meetings and on mauirecovers.org

What is a clean-out?

It is an access point for sewer maintenance, including blockages, and to see if the property's sewer lateral is connected to a main sewer line.

What is a stub-out?

A stub-out is the end of a pipe ready to be connected for sewer service.

Who is responsible for maintaining and repairing the sewer?

The sewer main is to be maintained by the County of Maui Department of Environmental Management (DEM) Wastewater Reclamation Division (WWRD); the lower lateral from the main to the property line is maintained and repaired by WWRD. Everything inside the private property, including the property’s sewer, or upper lateral, including the required cleanouts, overflow device, and grinder pump (if needed) shall be installed and maintained by the property owner.

What are the estimated monthly sewer costs?

A breakdown of residential sewer use fees is available at www.mauicounty.gov/811/Residential-Fees

How much will it cost to connect to sewer?

The cost to connect to sewer varies depending on property location and type of use. Connection fees for residential properties are limited to permit fees and local facilities charges. These fees do not include any work that would need to be done on your property, such as laying pipe from a house to the public sewer or abandoning the current cesspool. In addition, if the sewer is not immediately adjacent to your property or the public lateral does not meet your property line, construction costs with the public right-of-way may be necessary.

What happens if I do not have the money to connect?

The County is looking into potential funding sources to assist low-income households with connecting to the sewer. Owners seeking this kind of assistance should contact the WWRD (808-270-7417).

FAQs on Wahikuli Sewer Project

Download FAQs (PDF)

U.S. EPA Statement to Wahikuli Houselots Subdivision residents, and similar fire-impacted homes in the Lahaina area, regarding temporary cesspool use

Effective March 19, 2024

learn more (PDF)

Contacts

Environmental Protection Agency (EPA)

Call (808) 229-5184
Email: R9Wildfiresinfo@epa.gov
Visit https://www.epa.gov/maui-wildfires

County of Maui Wastewater Division: 

Call (808) 270-7417

Hawai’i State Department of Health: 

Call 833-833-3431 or 808-586-4468
Visit health.hawaii.gov/mauiwildfires

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