About › Certification
Yes, we're certified. Here's how to check.
Every ST3 test is performed by Sean Gajewski, a backflow prevention tester certified by the South Carolina Department of Environmental Services (SC DES, formerly DHEC). South Carolina requires every backflow test to be done by a state-certified tester. The details are below, along with how to confirm them on the State's own list in under a minute.
State tester certification
Sean Gajewski
Backflow Prevention Certification · SC Department of Environmental Services
- Certificate No.
- 110332728
- Type
- General
- Issued
- May 22, 2025
- Valid through
- June 30, 2028
A General certification is the class that may test backflow prevention assemblies for the public. State certifications run for three years and are renewed by written exam and a hands-on wet-lab test. Want a copy of the card for your records? Ask and we'll send it.
Don't take our word for it
Verify it with the State
SC DES publishes every certified tester in a searchable list. Our name is on it; here is how to find it.
Filter the State's list
In the report below, set County to "Charleston" (the county SC DES files us under) and tick "Backflow Tester Type 1 - General".
Find ST3 Consulting
The rows are in alphabetical order by company name. Scroll to "ST3 CONSULTING, LLC". The Site Name column reads Sean Gajewski.
Match the details
The row shows Type 1 - General and our address, 206 Helena Park Drive, Summerville, SC 29486. That is the certification on the card above.
This list is published and maintained by South Carolina Department of Environmental Services; ST3 Consulting does not control its contents.
Also on file
Calibrated equipment, current training
A certification is only half of a valid test. The gauge has to be accurate too, and the State checks it. Copies of these go to your water purveyor with every report we file.
Test gauge calibration
Mid-West 845-5, serial 10230334. Calibrated by Parker Instrument on May 29, 2026; next due May 29, 2027.
CurrentTester training
Backflow Prevention Tester Training and Certification, University of Florida TREEO Center, completed May 19, 2025.
Filed, every time
Your test report goes to your water purveyor with the calibration sheet and the tester certification attached, and a copy lands in your free online dashboard.
Checked out?
Let's get your test on the calendar.
Residential tests from $49.99, filed with your purveyor within 24 hours.