Septic System Installation & Replacement Cost Guide — Hilo, HI

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

Service Cost Ranges

Service	Low	Average	High	Unit
New Septic System Installation	$10,400	$23,400	$52,000	per project
Septic Tank Replacement	$3,900	$7,800	$15,600	per project
Drain Field Replacement	$6,500	$15,600	$32,500	per project

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Older housing stock (pre-1972) increases complexity and materials cost

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

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Limited provider competition can increase pricing above regional averages

✓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 Hilo.