Septic System Installation & Replacement Cost Guide — Waipahu, HI

Verified 2025 pricing for septic system installation & replacement services in Waipahu. Updated quarterly from local contractor data.

Service Cost Ranges

Service	Low	Average	High	Unit
New Septic System Installation	$11,600	$26,100	$58,000	per project
Septic Tank Replacement	$4,350	$8,700	$17,400	per project
Drain Field Replacement	$7,250	$17,400	$36,250	per project

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Older housing stock (pre-1978) increases complexity and materials cost

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Year-round heat and humidity create constant demand, keeping rates elevated

✓Get at least 3 quotes

✓Ask about seasonal discounts

✓Bundle multiple services

✓Check for manufacturer rebates

✓Verify license before hiring

See who offers the best value for money in Waipahu.