Loader said he thought that sharing images of the work would raise awareness of important social issues.
He said he should have kept a closer eye on the content, the pages have been taken down, and the company is reviewing its future on social media.
Images posted by the business included gory images of the aftermath of suspected suicides, attempted suicides, assaults, sudden deaths and domestic violence.
Crime Scene Cleaners started its Facebook page in March 2019, and it began posting photos of scenes in April 2020, with some garnering more than 100 reactions, dozens of comments, and shares.
The Facebook page has more than 2000 followers, the Instagram has more than 5000.
The business is a contractor for Ports of Auckland and KiwiRail, and the Auckland and Christchurch City Councils also confirmed they had also paid the business for cleans.
The Ministry of Justice confirmed three payments had also been made to the business, in 2017, through the Victim Assistance Scheme.
Crime Scene Cleaners has said in Facebook posts that New Zealand police and the Ministry of Social Development have paid for cleans too, but these agencies would not confirm this to RNZ, instead saying a Official Information Act request - which can take up to 20 working days - was necessary.
Crime Scene Cleaners helped clean Al Noor mosque after the 2019 terrorist attacks, but Loader told RNZ photos were not taken in the mosque because staff were asked not to have phones onsite.
The police publicly thanked the business for its services at the time.
Where to get help:
• Lifeline: 0800 543 354 (available 24/7)
• Suicide Crisis Helpline: 0508 828 865 (0508 TAUTOKO) (available 24/7)
• Youthline: 0800 376 633 or text 234 (available 24/7)
• Kidsline: 0800 543 754 (available 24/7)
• Whatsup: 0800 942 8787 (12pm to 11pm)
• Depression helpline: 0800 111 757 or text 4202 (available 24/7)
• Anxiety helpline: 0800 269 4389 (0800 ANXIETY) (available 24/7)
• Rainbow Youth: (09) 376 4155
If it is an emergency and you feel like you or someone else is at risk, call 111.