Leak Detection & Repair Services

Take Control of Your LDAR Program

Leak Detection and Repair programs built around your facility, your requirements and the way you operate. From Method 21 and optical gas imaging (OGI) to component inventories, repair tracking, documentation and reporting, Onterris helps you build and execute a defensible LDAR program.

Talk to an LDAR Expert

An employee inspecting a yellow pipeline from an overhead platform.

Close up shot: pipeline and valve chemical plant

Find leaks. Know what matters. Act on it.

Match the method to the requirement

Federal rules, state requirements, permits and facility-specific obligations can call for different monitoring approaches. Onterris helps determine where Method 21, OGI or other approaches fit so your program is built for your needs.

Find leaks safer, faster and more efficiently

OGI gives technicians a faster way to scan equipment and visualize methane, VOCs and other fugitive emissions, helping teams locate leaks and move from detection to repair more efficiently.

Track leaks through repair

Track components, inspections, leaks, repairs and program activity in Target Online, giving your team a centralized view of LDAR performance and a continuous record of what happened, when and why.

Keep a defensible audit trail

Keep inspections, repair activity, field documentation and reporting connected so your team can quickly report on program activity when regulators, auditors or internal stakeholders need it.

Build the best LDAR program for your facility

The right LDAR program depends on your equipment, regulatory requirements, operating environment and internal resources. Onterris brings the field personnel, technology, program infrastructure and technical expertise together so you can build the approach that works for your facility and keep it working over time.

Method 21

Onterris technicians provide component-level monitoring while supporting the documentation and follow-up required to carry findings through the full program.

Routine component monitoring
Valves, pumps, connectors and other applicable components
Leak identification and documentation
Repair tracking and reinspection
Field data and reporting support
Ongoing LDAR program execution

Optical gas imaging

Onterris uses optical gas imaging across regulatory and operational leak detection programs, helping facilities find fugitive emissions efficiently while connecting survey findings directly to repair, follow-up and program records.

Methane and VOC leak detection
Facility and equipment surveys
Component-dense process areas
Hard-to-access equipment
Leak investigation and repair prioritization
NSPS OOOOa/b/c and Subpart W support

Appendix K program support

Onterris has 20+ Appendix K-certified technicians available nationally, backed by experienced senior operators and the systems needed to track qualifications, training and ongoing program requirements.

Appendix K program readiness and transition planning
Qualified OGI technician deployment
Senior-operator oversight
Operator qualification and training tracking
Multi-site and ongoing program execution
Required field procedures and audits

End-to-end LDAR program management

Onterris combines hands-on field expertise, dedicated program managers and our digital platform, Target Online, to manage your entire LDAR program, from field surveys, maintenance information, compliance reporting and more.

Component inventory development and maintenance
Monitoring schedules and inspection activity
Reinspection and documented closure
Technician and qualification records
Data QA/QC and regulatory reporting support
Program records and audit trails

Worker in a hard hat using a tablet at an industrial site.

Environmental treatment specialist overseeing remediation equipment for 1,4-dioxane and specialty VOC treatment operations.

An LDAR program you can rely on

Onterris helps clients design, implement and optimize LDAR programs that align regulatory requirements with operational realities, delivering accurate emissions data, streamlined compliance workflows and improved environmental performance across facilities. Talk to an LDAR expert today.

Case Study

Modernizing LDAR at Freeport LNG

Freeport LNG’s original LDAR assumptions were built around roughly 10,000 components. A full inventory review identified more than 76,000 components, making the initial Method 21-heavy approach difficult to execute.

Onterris helped Freeport LNG develop and implement an OGI-based program aligned with permit requirements and operating reality. The site now conducts facility-wide camera surveys every two months, with Onterris supporting monitoring, quality assurance, repair tracking and program documentation.

Read the Case Study

A group of large sea baring oil tankers moored at a Texas oil refinery near Trinity Bay just outside of Houston, Texas, loading oil for export throughout the world.

Talk to an expert about your LDAR program

Fill out this form to talk with an LDAR expert about your facility, program requirements and monitoring objectives.

Colorful, marbled oil patterns and a modern oil and gas facility with metal towers, pipes, and refinery equipment

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Designing a Modern LDAR Program: Why Compliance Alone Is No Longer Enough

The best LDAR programs no longer ask, “Are we compliant?” They ask, “What are our emissions telling us about our operation?”

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Elizabeth McGurk

A Smarter Approach to Methane Management in Wastewater Treatment Plants

With better visibility into emissions, operators can act on high-impact leaks, reduce odor and strengthen maintenance outcomes

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Appendix K Certification: Why OGI Compliance Demands Expertise and Discipline

The technical standard that determines whether your methane emissions data withstands regulatory scrutiny

Chemical processing plant with tall industrial towers and pipes against a clear blue sky

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Elizabeth McGurk

Texas Unlocks Faster Path to OGI-Based LDAR Compliance for Oil & Gas

New TCEQ guidance signals a broader shift toward flexible, technology-driven emissions management

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The Environmental Strategy Maturity Curve

Connect your environmental programs to operational impact.

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LNG Methane Emissions Measurement & Monitoring

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