TTI Tank Inspection Expands into Potable Water Infrastructure: Why It Matters for Compliance

Tank inspection services traditionally focused on fuel storage (ASTs/USTs) are increasingly crossing into potable water infrastructure, think water towers, elevated tanks, and reservoirs. This shift reflects overlapping technologies, shared regulatory frameworks, and the urgent needs of aging municipal assets. TTI’s tank inspection division includes these systems in its scope, offering facilities unified expertise across fuel and drinking water storage.

Water Towers 101: Types and Common Challenges

Municipal water towers, standpipes, multi-column, or single-pedestal designs, typically last 40-60 years before major issues emerge. Common failure modes include shell corrosion (especially at welds), foundation cracks from settlement, overflow pipe leaks, and coating degradation exposing steel to moisture. Northeast facilities often see spalling in multi-column bases after 50 years due to freeze-thaw cycles and poor drainage.

These assets store and pressure drinking water for communities, so downtime risks public health and service disruptions.

Inspection Parallels: Fuel Tanks Meet Water Towers

Fuel AST inspections under API 653 share DNA with water tower protocols like AWWA D100/D2000:

• External visuals typically every 1-5 years (both standards).
• Internal exams typically every 3-10 years, using rope-access, drones, or confined-space entry.
• NDE methods transfer directly: ultrasonic thickness gauging (UTG) for shell thinning, magnetic flux leakage (MFL) for floor scans, cathodic protection checks.

Water systems add NSF/ANSI 61 certification for potable contact, but the core assessment—leak detection, coating integrity, seismic bracing—mirrors fuel work.

Regulatory Drivers Fueling the Expansion

The Safe Drinking Water Act (SDWA) drives routine monitoring, amplified by Lead and Copper Rule action levels and PFAS regulations. States like NJ/PA require DOH-approved inspections for public systems. The Infrastructure Investment and Jobs Act (IIJA) allocates $50B for water upgrades through 2026, funding condition assessments.

Facilities face unified calendars: fuel SPCC plans alongside water quality reports, making consolidated vendors efficient.

Benefits of Integrated Fuel and Water Programs

One provider streamlines compliance tracking, reduces mobilization costs, and aligns risk assessments. Facilities avoid siloed vendors, ensuring consistent NDE data formats and faster turnaround on API/AWWA reports. Forward-thinking utilities consolidate now to manage aging infrastructure holistically.

TTI Tank Inspection brings proven AST/UST methods to potable water, helping municipalities and industries stay ahead of regs and repairs.  Contact us to discuss your water tower assessment needs.

Contact Carol LaRosa, Business Administrator, Inspection Division, at caroll@ttienv.com or John Trotto, Director of Inspections, at johnt@ttienv.com