# Billy Gilmartin

> Billy Gilmartin is the co-founder and co-CEO of SewerAI, a company developing AI-assisted sewer inspection and infrastructure planning software. He previously built a large-diameter sewer cleaning and inspection business, Pipe & Plant, and brings contracting and commercial experience to his partnership with technical co-founder Matt Rosenthal.

- **Role:** Co-CEO & Co-Founder at SewerAI
- **Organizations:** SewerAI, Pipe and Plant Solutions, Inc.
- **Education:** BA in International Relations and Business Administration, University of San Diego
- **Known for:** Built a sewer cleaning and inspection contracting business serving major US urban systems., Co-founded SewerAI in 2019., Co-led SewerAI through its 2024 Series B and 2026 strategic investment.

## Career timeline

- **2007** — Completed a BA at the University of San Diego, according to The Org.
- **2011** — Developed a proprietary large-diameter sewer cleaning system, according to his company biography reproduced by Equilar.
- **2012** — Began as founding CEO of Pipe and Plant Solutions in January, according to The Org.
- **2018** — Met Matt Rosenthal late in the year while operating a sewer contracting business.
- **2019** — Co-founded SewerAI with Matt Rosenthal.
- **2021** — Presented a condition-assessment case study with Eric Sullivan at the July UI conference as SewerAI CRO.
- **2024** — SewerAI announced a $15 million Series B led by Innovius Capital.
- **2026** — Identified as co-CEO and co-founder in current company materials; SewerAI announced a JMI-led strategic investment.

## Achievements

- Built a sewer cleaning and inspection contracting business serving major US urban systems.
- Co-founded SewerAI in 2019.
- Co-led SewerAI through its 2024 Series B and 2026 strategic investment.

## Latest updates

- **2026-09** — SewerAI announced a Burns & McDonnell implementation partnership for utilities in the United States and Canada on September 28.
- **2026-09** — SewerAI announced general availability of Command Center, a plain-language workspace inside PIONEER.
- **2026-06** — SewerAI announced a strategic investment led by JMI Equity on June 2; the amount was not disclosed.
- **2026-03** — Discussed utility adoption and the move toward faster repair delivery in a March 24 interview.

## Links

- Website: https://www.sewerai.com/
- LinkedIn: https://www.linkedin.com/in/billgilmartiniv

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Profile page: https://yespress.io/billy-gilmartin
Published by YesPress — https://yespress.io
Last updated: 2026-10-15