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Earl E. Preston, JrLicensed

Licensed septic contractor based in Jarrettsville, MD

Name	Earl E. Preston, Jr
Company	Earl E. Preston Jr. Inc.
License number	00907
License type	Registered On-Site Wastewater (Septic) Professional
License status	Current — MD State Board of On-Site Wastewater Professionals
License expires	2026-12-31
Based in	Jarrettsville, Maryland 21084
Phone	(410) 557-8100

"Based in" is the city on the business's state license record. That can be a mailing address; it doesn't tell you where the business works.

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How to verify this license

We publish the license details exactly as they appear in Maryland's official licensing records; we do not vouch for the business itself. Before hiring, look up license #00907 directly with the state, confirm it is still active, and ask for a current certificate of insurance.

Source: MD State Board of On-Site Wastewater Professionals - registered individuals, last checked 2026-08-17. Verify at the official source.

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