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Septic Services in Maui, HI

Maui County County · Pop. 167,417

Maui County encompasses the islands of Maui, Molokai, Lanai, and Kahoolawe, covering an extraordinarily diverse range of climates and soil types — from the rain-soaked windward slopes of Haleakala to the bone-dry leeward coast near Makena. The county's booming resort development in the Kihei-Wailea corridor and Lahaina West Maui created major sewage infrastructure, but the agricultural upcountry communities of Makawao, Kula, and Haiku, as well as the entire island of Molokai and much of Lanai, are served by private IWS. Hawaii's 2050 cesspool ban has significant implications for Maui, where cesspools are common in older properties throughout upcountry communities. The nearshore coral reef ecosystems of the Maui Nui basin — among the healthiest remaining in Hawaii — drive strict coastal wastewater standards.

Services in Maui

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Drain Field Repair

Restore or replace failed leach fields and drain lines to prevent sewage surfacing and groundwater contamination.

$2,000 – $15,000

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Grease Trap Pumping

Commercial grease trap cleaning and pumping to prevent sewer blockages and maintain health code compliance.

$200 – $800

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Septic Inspection

Comprehensive evaluation of your septic system's condition, required for real estate transactions in most states.

$300 – $600

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Septic System Installation

Complete new septic system design and installation, from perc testing to final inspection.

$3,500 – $20,000

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Septic Tank Pumping

Regular pumping removes accumulated solids from your septic tank, preventing backups and extending system life.

$275 – $600

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Septic Repair

Diagnose and fix septic system problems including leaks, clogs, baffle failures, and component replacements.

$500 – $5,000

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Well Drilling

Professional water well drilling for residential and commercial properties without access to municipal water.

$6,000 – $25,000

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Well Pump Repair

Diagnose and repair well pump failures, pressure tank issues, and water flow problems.

$300 – $3,000

Septic Providers in Maui (8)

Septic Service Costs in Maui

Service Average Cost
Septic Tank Pumping $375 - $700
Septic System Installation $18,000 - $50,000

Soil Conditions

Lahaina silty clay and Paia silty clay loam on central valley and coastal plains — Typic Haplusterts derived from basaltic parent material; Wailuku silty clay loam on lower isthmus; Makawao and Makena series loams and sandy loams on middle slopes with moderate percolation; Pulehu sandy loam on Kihei coastal plain with good percolation

Pulehu sandy loam (Typic Ustifluvent) on the Kihei coastal plain is the most suitable soil for conventional IWS on Maui — moderately deep alluvial soil with percolation rates of 15 to 35 minutes per inch. Paia silty clay loam (Typic Haplustert) in the central isthmus has slow percolation at 45 to 90 minutes per inch and shrink-swell activity. Makawao loam (Typic Humustept) in upcountry has moderate percolation of 20 to 50 minutes per inch. Many Maui soils are derived from thin basalt weathering profiles where depth to volcanic rock restricts system design.

Water Table: 10 to 25 feet in Kihei and Lahaina dry leeward areas; 3 to 8 feet near stream corridors and taro fields on windward slopes

Local Regulations

Maui County Department of Environmental Management and Hawaii DOH HAR 11-62 govern all IWS on Maui. The Maui Nui coral reef ecosystem triggers the state's most stringent near-coastal setback and treatment standards. Cesspool conversion to IWS is required by 2050. Upcountry agricultural properties, particularly in the Kula-Makawao area, face increasing scrutiny as residential density grows. All systems require PE design and DOH approval.

Maui County Department of Environmental Management and Hawaii DOH jointly issue IWS permits. Maui's developed resort and residential areas (Kihei, Lahaina, Makawao) are partially sewered via Maui Department of Environmental Management. Rural and upcountry areas require DOH and county permits. Fees $600 to $1,000. Licensed Hawaii PE design required for all systems.

Frequently Asked Questions — Maui

What is the cesspool situation in Maui County?
Maui County has a significant number of cesspools — particularly in older upcountry communities like Haiku, Huelo, and Keanae — that must be converted to septic systems or connected to sewer by Hawaii's 2050 deadline. Cesspool conversions on Maui can be expensive ($20,000 to $50,000) due to high material costs, PE design requirements, and the variable volcanic soil conditions. Property owners with cesspools should plan and budget well in advance of the 2050 deadline rather than waiting until contractor demand peaks.
How do Maui's coral reefs affect IWS regulations?
Maui's nearshore coral reefs — particularly the reefs of Molokini, Makena, Kihei, and West Maui — are designated Marine Life Conservation Districts and are among Hawaii's most valuable ecological resources. Nutrient enrichment from IWS effluent promotes algae growth that smothers coral. Hawaii DOH requires advanced treatment for any IWS within 300 feet of marine waters, and in some critical reef zones, no IWS is permitted at all. Wastewater must be diverted to sewer or treated to advanced tertiary standards.
What is different about septic systems in Maui upcountry vs. the coast?
Upcountry Maui (Makawao, Kula, Pukalani elevations of 1,500 to 3,500 feet) has cooler temperatures, significantly higher rainfall, and different soil conditions than the dry leeward coast. Upcountry soils tend to be deeper and more developed with better treatment capacity. However, higher rainfall means seasonal soil saturation is a real concern, and systems must be sized for wet-season conditions. Coastal properties in Kihei face the sandy-soil rapid-percolation and coral-reef treatment challenges.
Does Molokai or Lanai have different IWS rules from Maui?
Molokai and Lanai are part of Maui County and subject to the same Hawaii DOH HAR 11-62 regulations. Both islands are almost entirely dependent on private IWS since municipal sewer infrastructure is minimal outside of Kaunakakai (Molokai) and Lanai City. The islands' smaller contractor capacity means IWS work can have longer lead times and higher costs than on Maui. The 2050 cesspool conversion deadline applies equally to all islands.
How much does IWS installation cost on Maui?
IWS installation on Maui is among the most expensive in the country — $18,000 to $50,000 for a standard residential system, with advanced coastal systems running even higher. Costs reflect Hawaii's high labor rates, imported material costs, PE design requirements, and the complex permitting process involving both Maui County and Hawaii DOH. Molokai and Lanai installations are even more expensive due to barge shipping of materials.

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