We are an environmental engineering firm specializing in the planning, design, and construction of water and wastewater facilities.
United States
Joined May 2009
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From our Carollo Engineers family to yours, Happy Independence Day! We hope you have a safe and memorable holiday celebrating with family, friends, and community.
As we welcome 2026, we’re thankful for the partnerships, teamwork, and innovation that shaped this past year—and excited for everything ahead!
Carollo's Rosa Yu sat down with WaterWorld to discuss a pilot-scale study on PFAS treatment in GAC-capped drinking water filters.
Hear lessons learned, alternatives they’re exploring, and how this process can help other utilities facing PFAS challenges:
carollo.com/news/pfas-treatm…
In a recent Streaming Water podcast, Carollo’s Diana Leonard and John Rehring share how The ABCs of Water Reuse is using bold visuals, clear language, and relatable examples to turn complex engineering into concepts general readers can understand.
Listen:
carollo.com/news/abcs-stream…
As semiconductor manufacturing ramps up across the US, so does its demand for water.
In WE&T, Carollo’s John Rydzewski explores why conventional zero-liquid discharge systems aren’t enough.
See how the industry can rethink water reuse:
carollo.com/publications/chi…
From co-op student to regional reuse lead, Matt Holitzki’s path in the water industry shows how hands-on experience and a passion for sustainability can shape a meaningful career.
Learn more about Matt’s journey as a water professional:
carollo.com/news/matt-holitz…
Oregon’s Willamette Water Supply Program is raising the bar for resilient, community-focused water infrastructure.
Carollo’s experts break down the project in a recent @WaterOnline article. Read the article to learn more about this incredible project:
carollo.com/publications/wws…
Congrats to @SanDistricts for receiving the 2025 CASA Excellence in Innovation and Resiliency Award!
Carollo is proud to have supported this groundbreaking project and contributed to establishing a scalable model for sustainable wastewater treatment across California and beyond.
As utilities face rising energy costs and growing sustainability demands, one question keeps surfacing: how can wastewater treatment become more energy efficient without compromising nutrient removal?
Learn strategies for your facility:
carollo.com/publications/red…
