Septic System Installation & Replacement Cost Guide — Billings, MT

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

Service Cost Ranges

Service	Low	Average	High	Unit
New Septic System Installation	$8,000	$18,000	$40,000	per project
Septic Tank Replacement	$3,000	$6,000	$12,000	per project
Drain Field Replacement	$5,000	$12,000	$25,000	per project

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

✓Get at least 3 quotes

✓Ask about seasonal discounts

✓Bundle multiple services

✓Check for manufacturer rebates

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See who offers the best value for money in Billings.