By HomeGuide's national count, a conventional septic system costs $3,500 to $8,500 installed. Baltimore City is sewered, but northern Baltimore County and rural Howard and Anne Arundel counties still have many septic systems.
The costs shown here are national ranges that HomeGuide publishes, not our own prices. In Baltimore, boulders, groundwater, alley access and haul distance are what really set a job's cost. Figures checked October 2026.
What does a new septic system cost in Baltimore?
By HomeGuide's national count, a new septic system costs $3,500 to $8,500 conventional, $4,000 to $15,000 alternative and $15,000 to $50,000 or more engineered. By HomeGuide's national count, a 1,000-gallon tank costs $1,000 to $1,500.
What does it cost to replace a drain field in Baltimore?
By HomeGuide's national count, replacing a drain field costs $3,000 to $15,000, with a $7,900 national average. By HomeGuide's national count, repair costs $1,000 to $5,000 and a new tank and field $4,500 to $20,000.
How do I know my drain field is failing in Baltimore?
A drain field is failing if you see wet spots or lush grass over it, smell sewage, or have slow drains and backups. Pumping is $300 to $700 by HomeGuide's figures.
Do I need a perc test?
Yes. A percolation test is part of designing a septic system, and Baltimore County's Ground Water Management section offers perc tests for repair and developed lots. By HomeGuide's national count, a perc test costs $600 to $2,000.
What does a mound system cost in Baltimore?
By HomeGuide's national count, a mound septic system costs $25,000 to $50,000 or more. It builds the absorption area above ground on sand, for sites with shallow rock or a high water table.
What does replacing a collapsed septic line cost in Baltimore?
By HomeGuide's national count, replacing a collapsed or broken septic line costs $40 to $180 per foot, or $1,600 to $7,200. A camera run down the line finds the failure.
How big a hole does a 1,000-gallon tank take, and how do I find the lid on mine?
The hole for a 1,000-gallon tank must be larger than the tank so it can be set level; the design sets the depth. For digging only the hole, HomeGuide gives no number. To find the lid, ask the county for your system's records, then probe.
Can I connect to public sewer instead in Baltimore?
You can connect to public sewer if a line is close and the county allows it. By HomeGuide's national count, converting septic to sewer costs $3,000 to $15,000 and hookup fees $1,000 to $15,000.
Who issues septic permits around Baltimore?
In Baltimore County, the Department of Environmental Protection and Sustainability's Ground Water Management section handles septic systems, and permit applications must be submitted by a licensed installer with a design by a licensed designer. Howard and Anne Arundel counties have their own health departments. Our part is the digging, for the licensed installer.
Want to know what your job will cost? Call or text (410) 873-7935. We visit the site and then write up the scope and price.