Environmental Consultants — Columbia, Missouri
Shell Engineering
& Associates, Inc.
Environmental Consulting Since 1975

Air. Water.
Compliance.
Done Right.

Regulated facilities trust Shell Engineering to keep them compliant, permit-ready, and protected — from initial application to ongoing meteorological monitoring and beyond.

Talk to an Expert View our services →
1975
Founded in Columbia, MO
50+
Years of continuous practice
All
Facility sizes — small to major source
One
Stop for air, water & site services
Services
Everything your facility needs to stay compliant.
Air Permitting
Construction permits, Title V and intermediate operating permits, PSD/NSR major source review, and permit-by-rule registrations. We handle the process — you keep running.
MDNR · EPA
Met Tower Monitoring
Site-specific meteorological programs for PSD applicants and permit holders. Monthly data collection, QA/QC, and validated reports delivered on time, every month.
Recurring · Campbell Scientific
Ambient Air Monitoring
Criteria pollutant and air toxics monitoring programs to satisfy pre-construction and permit condition requirements. QAPP development and data validation included.
PSD · NAAQS
Dispersion Modeling
AERMOD and screening-level modeling for permit applications, ambient impact demonstrations, NAAQS compliance, and odor nuisance investigations.
AERMOD · AERSCREEN
Water & Stormwater
Clean Water Act and Safe Drinking Water Act compliance, NPDES permits, stormwater pollution prevention plans, wastewater pretreatment, and SPCC plan preparation.
CWA · SDWA · NPDES

We helped build Missouri’s environmental programs. Now we help you navigate them.

Shell Engineering was founded in 1975 by Harvey Shell — who headed Missouri DNR’s first Air Quality Program before entering private practice. Today the firm is led by Charles Shell, with the same commitment to senior-level expertise that has defined Shell Engineering for over five decades.

Our Story →
50+
Years serving regulated industries across the country
All
Facility sizes — from grain elevators to major power plants
One
Senior point of contact on every project, every time

Ready to talk through your compliance needs?

Whether you’re facing a permit deadline, planning a new facility, or just want to know where you stand — we’re happy to help.

Get in Touch (573) 445-0106