Septic System Installation & Replacement Cost Guide — Mobile, AL

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

Service Cost Ranges

Service	Low	Average	High	Unit
New Septic System Installation	$6,800	$15,300	$34,000	per project
Septic Tank Replacement	$2,550	$5,100	$10,200	per project
Drain Field Replacement	$4,250	$10,200	$21,250	per project

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Older housing stock (pre-1968) increases complexity and materials cost

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High humidity increases wear on systems; maintenance needs are higher

✓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 Mobile.