The County Book, Anne Arundel County

Septic

OSDS

Dates change; confirm with the official source before you act on one.

Every entry below names its official source and the date it was checked against that source.

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Renewals

On-site wastewater provider credentials run 2 years

Individuals providing on-site wastewater services (install, pumping, repair, property-transfer inspection) must be licensed by the State Board of On-Site Wastewater Professionals. Registration is valid 2 years while Board licensing is implemented.

Jurisdiction: Maryland

Source: MDE, State Board of On-Site Wastewater Professionals pages

Checked against this source on 2026-10-30

Property-transfer inspector licenses renew every 2 years

Property-transfer inspections are performed by a licensed property-transfer inspector using the state standard form. Property-transfer inspector licenses renew every 2 years.

Jurisdiction: Maryland

Source: MDE, State Board of On-Site Wastewater Professionals / PTI pages

Checked against this source on 2026-10-30

Cycles

BAT units: inspection and O&M at least once a year by a certified provider

A Best Available Technology (BAT) septic unit must be inspected by a certified service provider, with necessary operation and maintenance performed, at least once a year. This annual service is a mandate, not guidance.

Jurisdiction: Maryland

Source: Anne Arundel County Health Dept. septic guidelines

Checked against this source on 2026-10-30

Paperwork

Property-transfer inspection forms retained 5 years

Property-transfer inspection forms must be retained 5 years.

Jurisdiction: Maryland

Source: MDE, PTI pages

Checked against this source on 2026-10-30