---
title: "Certifications that actually matter — questions answered"
description: "Questions about certifications that actually matter, answered with sources and without a sales pitch."
canonical: https://biohazardcrown.shop/questions/what-certifications-matter/
language: en-US
risk_tier: R1
last_reviewed: 2026-08-18
---
# Certifications that actually matter

There are two completely different kinds of credential in this trade, and companies routinely present the first as though it were the second.

## Voluntary versus required

A **voluntary industry credential** says a company or person chose to be trained and assessed against a standard the industry wrote for itself. That is worth something. It is not a licence, and no government issues or checks it.

A **government requirement** says a state decided this work needs registering and made it unlawful to do without. Only some states have.

## What each one actually is

**IICRC S540** is the ANSI-approved consensus standard for trauma and crime scene cleanup — first edition 2017, second edition 2023. A company saying it “works to S540” is telling you which rulebook it follows.

**TCST** is the IICRC’s certification for an individual technician, built on S540. It certifies a person, not a company. The question worth asking is whether the people who will actually be in your home hold it — not whether the company has ever employed someone who did.

**WRT and AMRT** are adjacent water-damage and mould credentials, commonly held because the jobs overlap, and genuinely relevant after sewage or long-standing moisture. Neither substitutes for S540 or TCST.

**State registration** is the only item a government issues, and only some states require it.

## What we could not verify, and therefore do not say

We cannot give you the prerequisites, hours or cost of the IICRC’s certifications — their site did not render for us, and we will not repeat figures from resellers. We do not describe ABRA, whose site is robots-blocked. We do not reference NIDS at all, because we could not identify the organisation behind the acronym. A company citing it is a reason to ask more questions, not fewer.

Written by [Biohazard Crown editorial team](https://biohazardcrown.shop/authors/editorial-team/)

Last reviewed: 2026-08-18

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- [Every question we answer](https://biohazardcrown.shop/questions/)

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