Compliance Resource · TIR34 → ST108 Migration
AAMI TIR34 Water Quality for Medical Device Reprocessing.
The 2007–2014 guidance document that defined hospital sterile-processing water for a generation — now superseded by AAMI ST108:2023. Use this page as a reference plus a side-by-side migration checklist across Texas, Louisiana, Alabama, and Mississippi.
TIR34 vs ST108 — Side-by-Side
If your policies still reference TIR34, use this checklist to identify gaps against ST108 — the standard actively cited by Joint Commission surveyors since 2024.
| Requirement | AAMI TIR34 (2007/2014) | AAMI ST108:2023 |
|---|---|---|
| Document type | Technical Information Report | ANSI-approved consensus standard |
| Language | Should / may (guidance) | Shall / must (mandatory) |
| Water categories | Utility / Critical (2 tiers) | Utility / Critical / Sterile-for-Injection (3 tiers) |
| Endotoxin limit | Recommended, not codified | ≤ 10 EU/mL (Cat 2), ≤ 0.25 EU/mL (Cat 3) |
| Testing frequency | Advisory | Explicit minimums |
| Staff competency | Not addressed | Required documentation |
Sources: AAMI TIR34:2014/(R)2021 & ANSI/AAMI ST108:2023. Consult the full documents for complete requirements.
Migrating from TIR34 to ST108
Most Gulf-region hospitals we visit still operate TIR34-era water infrastructure. Here is what we typically upgrade.
RO Capacity Uprate
Under-sized central RO systems get supplemental skids or replacement to meet ST108 Category 2 endotoxin/TOC limits.
Endotoxin & TOC Monitoring
Add in-line conductivity + quarterly endotoxin/TOC testing plus documented staff competency — new under ST108.
Policy & Documentation
Rewrite SOPs to reference ST108, add water-quality log templates, and prepare survey binder for Joint Commission/DNV.
Frequently Asked Questions
What is AAMI TIR34?
AAMI TIR34 (Technical Information Report 34) — 'Water for the reprocessing of medical devices' — was AAMI's original guidance document defining water-quality expectations for sterile processing, endoscope reprocessing, and pharmacy compounding. First published in 2007 and updated in 2014, it introduced the utility-water / critical-water framework that hospitals still use today.
Is TIR34 still valid, or has ST108 replaced it?
AAMI ST108:2023 has superseded the water-quality content of TIR34. TIR34 remains useful as background/context, but ST108 is now the enforceable consensus standard cited by Joint Commission, DNV, and CMS. Facilities that reference TIR34 in their policies should update those policies to cite ST108.
What are the key differences between TIR34 and ST108?
TIR34 was a Technical Information Report (guidance, non-mandatory). ST108 is a formal ANSI-approved standard (mandatory language). ST108 adds explicit numeric limits for hardness, conductivity, TOC, and endotoxin; specifies testing frequency; and defines documentation and staff-competency requirements — none of which were codified in TIR34.
Do hospitals still need to comply with TIR34?
Not directly — surveyors now cite ST108. However, many hospitals still have TIR34-era water-treatment infrastructure. A ST108 gap assessment on TIR34-era systems typically reveals under-sized RO capacity, missing endotoxin monitoring, or gaps in documentation.
How does Sterile Mate help facilities transition from TIR34 to ST108?
Sterile Mate performs on-site TIR34→ST108 gap assessments across Texas, Louisiana, Alabama, and Mississippi. We provide upgrade quotes for central RO capacity, DI polishing loops, endotoxin/TOC/conductivity monitoring, and quarterly compliance documentation — all under one dispatch center in Houston.
TIR34 references in your policies are a Joint Commission audit red flag.
Since 2024, Joint Commission expects facility water policies to reference the current standard (ST108). Policies still citing TIR34 as the primary standard often trigger EC.02.05.01 findings. Request a gap assessment — typical turnaround: one business day.