Has anyone looked into Water Services and Indoor Air Quality niches in US?

Hi All,

I've got a thesis around and am looking at deals in more niche water service and indoor air quality businesses (not sewerage/plumbing or HVAC pure plays) and wanted to see if anybody had any familiarity/expertise within the space in the U.S?

Looking more on the tech-enabled services and software side. I'm new to the industry, so if you or anyone you know has relevant experience in the space, I'd really value your input!

Thanks!