Septic System Regulations in Maryland

In Maryland, onsite wastewater (septic) systems are regulated by Maryland Department of the Environment (MDE), Wastewater Permits Program — Onsite Disposal Systems; professional licensing via the State Board of On-Site Wastewater Professionals, which sets the statewide code, and permits are issued and inspections carried out by county or local health jurisdictions. Installing, replacing or repairing a septic system here means, in sequence: a site and soil evaluation, a design, a permit application, an inspection while the system is open, and a final as-built record once it is approved.

Who regulates septic systems in Maryland

The state-level regulator is Maryland Department of the Environment (MDE), Wastewater Permits Program — Onsite Disposal Systems; professional licensing via the State Board of On-Site Wastewater Professionals (official program page). MDE sets statewide sewage disposal standards under COMAR 26.04.02, but septic permits are issued and administered locally by County Health Departments. MDE's own page states the Septic BAT Program (effective July 1, 2010) is implemented by local County Health Departments or other delegated parties.

The statewide onsite-wastewater code is cited as COMAR 26.04.02 (Sewage Disposal in Maryland); property-transfer inspections separately under COMAR 26.04.12; licensing board authority under Environment Article, Title 9, Subtitle 11A. We link the agency's own page above rather than restating specific numeric requirements from it, since those change by rule revision and by local amendment.

The permit sequence

The order of operations is broadly consistent across the country, even though the specific numbers in each step vary by state and often by county. None of the figures below are specific to Maryland; treat this as the shape of the process, and get the actual numbers from the agency linked above or from the county office.

1. Site and soil evaluation. A qualified evaluator (see licensing below) digs test pits or runs a percolation test, and records the soil profile, depth to seasonal water table, depth to any restrictive layer, and slope. This determines whether the lot can support a conventional system or needs an alternative design.
2. Design. Under most state codes, daily design flow is set from bedroom count, not square footage. That flow drives tank capacity, and the soil evaluation sets the drainfield application rate and therefore its size. The designer also lays out setbacks to wells, property lines, surface water, foundations and a reserve/replacement area.
3. Permit application. Submitted to whichever office issues permits here (state agency or county/district health office, per the delegation model above), along with the design and soil work.
4. Installation and open inspection. The installer builds the system, and it is inspected before backfill while it is still open to view.
5. As-built and approval. A final drawing of what was actually built is filed once the system is approved. That as-built is the document a future owner, pumper or inspector needs, and it is what ends up in the county record.

Who can design and install a septic system

Getting septic records in Maryland

Septic records in Maryland are generally held by the county or local health jurisdiction that issued the permit, not by the state agency, and are released under the state's public records law. We have not logged the specific statute name and response deadline for Maryland yet; check with the county office listed on its records page below, or with Maryland Department of the Environment (MDE), Wastewater Permits Program — Onsite Disposal Systems; professional licensing via the State Board of On-Site Wastewater Professionals.

Counties in Maryland we hold records for

We hold 45,104 septic records across 12 of 23 Maryland counties. Each county page below shows exactly where its records are kept and how many we hold.

Full Maryland county-by-county index · Open the parcel map

Common questions

Who regulates septic systems in Maryland?

Maryland Department of the Environment (MDE), Wastewater Permits Program — Onsite Disposal Systems; professional licensing via the State Board of On-Site Wastewater Professionals. MDE sets statewide sewage disposal standards under COMAR 26.04.02, but septic permits are issued and administered locally by County Health Departments. MDE's own page states the Septic BAT Program (effective July 1, 2010) is implemented by local County Health Departments or other delegated parties.

What is the septic permit process in Maryland?

The sequence is a site and soil evaluation, a design sized from the evaluation and (under most state codes) bedroom count, a permit application, an inspection before backfill, and a final as-built filed once the system is approved. Exact numeric requirements are set by the agency's own code, not restated here.

Who can install a septic system in Maryland?

Registered "Installer" under the Maryland State Board of On-Site Wastewater Professionals; MDE separately runs BAT-specific certification courses (e.g. Sand Mound Installer, At-Grade Installer, 5-year certification). https://mde.maryland.gov/programs/water/wwp/Pages/State-Board-of-On-Site-Wastewater-Professionals.aspx

How do I get septic records for a property in Maryland?

Septic records are generally held by the county or district health office that issued the permit. See our county-by-county Maryland index for the specific office and portal in each county.

Sources

• https://mde.maryland.gov/programs/water/bayrestorationfund/onsitedisposalsystems/pages/index.aspx
• https://mde.maryland.gov/programs/regulations/water/Documents/26-04-02_Sewage_Disposal_in_MD_12-13-2013.pdf
• https://mde.maryland.gov/programs/water/wwp/Pages/State-Board-of-On-Site-Wastewater-Professionals.aspx

Regulatory information on this page was researched against official state agency sources and last verified 2026-08-31. It is informational only: the agency linked above is authoritative, and requirements can change. We are not lawyers, not a government body, and not affiliated with, licensed or certified by any agency named on this page.