Letterle is an environmental consulting and remediation firm with offices in Allison Park (Allegheny County), Franklin (Venango County), and Bellefonte (Centre County), Pennsylvania. It is a Pennsylvania corporation that is also registered to do business in West Virginia, and holds a contractor's license issued by the West Virginia Contractor Licensing Board. Letterle's three locations allow it to extend its reach into central and eastern Pennsylvania as well as West Virginia, Ohio, New York and Maryland.

Letterle specializes in the investigation and remediation of petroleum releases, particularly former underground storage tank release locations. Key Letterle personnel have extensive experience with Phase I/II ESAs, geophysical assessments, and redevelopment projects throughout the United States. A growing area of Letterle's business is assisting clients with their regulatory compliance in areas such as NPDES permitting, spill plans, waste reports, and response to compliance actions.

Letterle's caseload includes over 200 former underground storage tank release sites with a majority of those projects funded by state insurance funds or private insurance. Letterle currently operates over 30 soil and groundwater remediation systems at sites in Pennsylvania and West Virginia. The majority of the remediation systems are either vacuum enhanced groundwater extraction systems or total phase extraction systems.

Our Mission

Letterle is a professionally managed, family-oriented environmental consulting company that will continuously strive to exceed expectations and nurture long-term relationships with its stakeholders, including:

Our Clients - We will provide cost-effective, innovative solutions to our clients' environmental problems and tirelessly work to earn and maintain their trust and respect.

Our Employees - We will create a safe and stable work environment with challenging career growth and will provide positive recognition for exceptional service.

Our Community - We will remain active and responsible members of the communities in which we work and live.

Our Founders - We will continue to capitalize on opportunities to expand and diversify as we hire new employees, develop new services and expand our geographic reach.