IICRC S100 vs R100: What Changed in 2021?
The IICRC S100 Standard Just Split in Two — Here's What Changed
The short version: the carpet cleaning industry's core standard of care split into two documents in 2021 — the S100 (the mandatory Standard) and the R100 (the Reference Guide). If your cleaner doesn't know the difference, they're not working to the current standard, and it can matter in a dispute.
S100 vs. R100: What's Actually Required
| Document | What It Is | Can It Be Cited in a Dispute? |
|---|---|---|
| S100 | The Standard — "shall/should" language defining the standard of care | Yes — this is the enforceable document |
| R100 | The Reference Guide — the how-to, science, and best-practice explanation | No — guidance only, not binding |
Older editions bundled both into one book. Separating them was required to meet ANSI's standards rules, and it means anyone quoting "the standard" needs to be quoting S100 specifically, not R100.
New Rule: Contaminated Carpet Isn't a Cleaning Job
The updated S100 is explicit about health effects tied to microbial contamination, and it draws a hard line: carpet affected by fecal matter, sewage, Category 2/3 water, heavy mold, or a sick-building odor is not a standard cleaning job. The correct response is to stop, document the condition, and refer out to S500 (water damage restoration) or S520 (mold remediation) protocols — not run a hot-water extraction over it.
Inspections and Documentation Are Now Mandatory
- Pre-cleaning and post-cleaning inspections are required, not optional
- Occupant health concerns, fiber identification, installation issues, and limitations must be documented in the job file
- The standard stays method-neutral — it doesn't endorse specific products, systems, or equipment
- Equipment expectations lean harder on well-filtered, HEPA-level vacuums to avoid aerosolizing fine particles during cleaning
What This Means When You Book a Cleaning
A cleaner working to the current S100 should be inspecting your carpet before they start, documenting fiber type and any pre-existing damage, and telling you upfront if something needs restoration referral instead of cleaning. That's not extra paperwork for its own sake — it's the standard of care, and it protects you as much as it protects the cleaner. At Colorado Choice Carpet Cleaning, this is built into every job, which is part of the value of hiring an IICRC-certified crew instead of whoever's cheapest on a given weekend.
What's the difference between S100 and R100?
S100 is the mandatory Standard — the shall/should language that defines the standard of care and is the document referenced in disputes. R100 is the companion Reference Guide that explains the science and reasoning behind it, but it's guidance, not a requirement.
Does this update apply to residential cleaning, or just commercial jobs?
Both. The S100 covers professional cleaning of textile floor coverings in residential and commercial settings alike — the inspection, documentation, and contamination-referral requirements apply regardless of the type of job.
How do I know my carpet cleaner is following the current standard?
Ask whether they're IICRC-certified and whether they perform a documented pre- and post-cleaning inspection. A crew working to the current S100 should be able to explain both without hesitation.
Service Areas We Cover
Colorado Choice Carpet Cleaning follows current IICRC S100 protocols on every job across the Denver Metro area:
- Castle Rock
- Highlands Ranch
- Aurora
- Littleton
- Parker
- Lakewood
- Centennial
- Franktown
- Denver
- Castle Pines
- Lone Tree
- Arvada
- Westminster
- Englewood
- Thornton
- Greenwood Village
- Roxborough Park
- Morrison
- Elizabeth
- Sedalia
- Wheat Ridge
- Broomfield
- Monument
- Larkspur
Sources: IICRC S100, ANSI/IICRC S100-2021
