Water is all we do
and we do it like no one else

In a world of generalists, a water specialist provides great value.
At Carollo, water is all we do.

This unwavering commitment to the water industry has been a hallmark of the company since our inception in 1933. Over the decades, this single-minded focus has allowed us to make some unique commitments to both clients and staff. It has opened the door to the very best talent in the water industry, innovative water solutions, unparalleled client service, and above all, a collaborative and collegial working environment that makes us a great company to work with.

The fact that this message is as relevant today as it was back in the 1930s is a reaffirmation of the core character and values of our company. The pressing challenges of today’s water industry require the concentrated focus provided by a specialist firm — one that is passionate about water and welcomes the obligation to get the most out of this precious resource.

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Carollo News

 Utah Valley Water Treatment Plant Improvement Project

Our legacy of award-winning projects continues, as the ACEC Utah branch selected Carollo's work on the Utah Valley Water Treatment Plant Improvement Project for the Engineering Excellence Honor Award!

The project restored the plant’s original 80 mgd capacity, delivered an additional 20 mgd at no cost, reduced disinfection byproducts, and improved performance despite tight site...

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OneWaterLA logo

It’s been a good week for One Water LA—the game-changing water planning project Carollo is heading up. The project was the cover story for ENR’s November 7/14 issue, and Water Online also...

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Water is all we do… and now we do it online. For the past three years, Carollo’s Blue Plan-it™ (BPI) decision support system has offered our engineers and clients a powerful one-of-a-kind tool for planning water and wastewater projects. Like most conventional software tools, the BPI desktop version requires license management, software installation, model setup training, and maintenance...

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Carollo Engineers has partnered with the San Diego Unified School District and the Biocom Institute Festival of Science and Engineering to promote Science, Technology, Engineering, Arts, and Mathematics (STEAM) education in local schools.

As part of the SDUSD six-week unit of study focusing on water education, Carollo produced this five-minute video of a young Carollo engineer taking us...

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Before image

The Design-Build Institute of America (DBIA) recently announced its 21st annual Design-Build Project/Team Award winners. Among the recipients was Carollo Engineers, winner of the National Award of Merit in the Water/Wastewater category for the Clifton (Colorado) Water District's Microfiltration/Ultrafiltration Water Treatment Plant Upgrade.

In 2014, the Clifton Water District selected...

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ENR Top Design Firm Cover

Carollo is very proud (and a little bit humbled) to have been selected by Engineering News-Record (ENR) as its 2016 California Design Firm of the Year. This is a huge honor, given not just the spread and size of the California market, but also the impressive list of engineering companies in the state. While we owe much of this honor to the hard work of our employees across the entire company,...

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FEATURED PROJECTS

Metro Wastewater Reclamation District, Colorado

100-mgd biological nutrient facility

Metro Wastewater Reclamation District’s (MWRD) long-term master plan acknowledged more stringent future discharge criteria for nutrients and recommended complete biological nutrient removal (BNR) at the Robert W. Hite Treatment Facility (RWHTF), prompting conversion of the high purity oxygen activated sludge process in the South Secondary Complex to a BNR air activated sludge process, similar to that currently being operated in the North Secondary Complex. In January 2008, Metro selected...

Metropolitan Water District of Salt Lake and Sandy, Utah

POM interior

Carollo was the lead consultant for design and construction services for the new 70-mgd Point of the Mountain Water Treatment Plant (POMWTP) for the Metropolitan Water District of Salt Lake and Sandy, located near Salt Lake City, UT. The $100 million project incorporated enhanced conventional processes based on a 12-month pilot test program that was conducted by Carollo. The processes included flash mix; flocculation; sedimentation, including plate settlers and intermediate ozone;...

City of Havre, Montana

Havre Milk River

The City of Havre owns and operates a 4.5-mgd conventional water treatment plant that treats water from the Milk River. The Milk River at Havre can be characterized by large seasonal variations in total suspended solids, color alkalinity, turbidity, and total organic carbon (TOC). Havre selected Carollo to perform an evaluation of the Havre Water Treatment Plant and distribution system and to develop a water master plan to guide Havre in renovating and upgrading the water treatment plant and...

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Industry News

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Water Diverters Must Meet April 1 Deadline Under New Measurement Requirement
Friday, February 17, 2017 -- Water News
The State Water Resource Control Board’s Division of Water Rights is reminding water diverters that they must file annual use reports for the 2016 calendar year by April 1 under the new measurement regulation.  The regulation requires that diversions greater than 10 acre-feet per annum... ..

Deadline Extended on Draft Resolution on Response to Climate Change
Thursday, February 16, 2017 -- Water News
The State Water Resources Control Board announced today that it has extended the comment deadline to March 3 at noon for its draft resolution for a comprehensive response to climate change. A public hearing on the draft resolution has been moved to March 7. The State Water Board will hold a publi... ..

Mandatory Evacuations Lifted as Lake Level Drops at Oroville
Tuesday, February 14, 2017 -- Water News
The Butte County Sheriff's Department on Tuesday lifted mandatory evacuation orders for more than 180,000 people as the California Department of Water Resources continued to stabilize the spillway emergency at Oroville Dam. Sheriff Kory Honea said residents could return home but would remain ... ..

State Water Board Launches Human Right to Water Web Portal
Tuesday, February 14, 2017 -- Water News
The State Water Resources Control Board on Feb. 14 launched a new Human Right to Water web portal intended to help the public find information related to efforts to address the state’s drinking water safety and affordability issues. The portal was first announced during the State Water Boar... ..

Releases Continue at Oroville Primary Spillway; Evacuation Orders in Place
Monday, February 13, 2017 -- Water News
Crews were working Monday to repair both the primary and emergency spillways at Oroville Dam, according to reports from the California Department of Water Resources. DWR was continuing to release more than 100,000 cubic feet per second from the damaged primary spillway Monday in an effort to lowe... ..

DWR Increases Releases from Lake Oroville to Avoid Emergency Spill
Friday, February 10, 2017 -- Water News
After several days of intense concern that damage to Lake Oroville’s main gated spillway could require use of the reservoir’s emergency spillway for the first time ever, the California Department of Water Resources Friday announced that with a break in storm runoff and increased relea... ..

New NASA Report Shows “Troubling” Increase in Subsidence, Impacts to Water In...
Thursday, February 9, 2017 -- Water News
The California Department of Water Resources Wednesday released a new report from NASA showing that areas of the San Joaquin Valley continue to experience significant subsidence, resulting in damage to state and federal water infrastructure. According to DWR, sinking land, known as subsidence, is... ..

State Seeks Federal Funding for $100 Billion in Priority Infrastructure Proje...
Thursday, February 9, 2017 -- Water News
Hoping to receive a portion of the $1 trillion in federal infrastructure investment funding promised by President Donald Trump, Gov. Jerry Brown’s office Wednesday submitted a list of priority infrastructure projects needed throughout the state.  The project list represents a total of ... ..

State Water Board Extends Emergency Water Conservation Regulation
Wednesday, February 8, 2017 -- Water News
Citing a need to be prudent and prepare for another possible dry year, the State Water Resources Control Board on Wednesday voted unanimously to extend the state’s emergency conservation regulation amid criticism that this year’s rains have ended California’s state of emergency.... ..

Drinking Water Safety and Affordability Issues Explored During State Water Bo...
Wednesday, February 8, 2017 -- Water News
The State Water Resources Control Board Wednesday held an in-depth workshop to discuss drinking water safety and affordability issues and options for developing and implementing a plan for a statewide low-income water rate assistance (LIRA) program as required by AB 401 (Dodd) of 2015. Following ... ..

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Industry News

Feb 17 Water Diverters Must Meet April 1 Deadline Under New Measurement Re...
The State Water Resource Control Board’s Division of Water Rights is reminding water diverters that they must file annual use reports for the 2016 calendar year by April 1 under the new measurement regulation.  The regulation requires t...
Feb 16 Deadline Extended on Draft Resolution on Response to Climate Change
The State Water Resources Control Board announced today that it has extended the comment deadline to March 3 at noon for its draft resolution for a comprehensive response to climate change. A public hearing on the draft resolution has been moved t...
Feb 14 Mandatory Evacuations Lifted as Lake Level Drops at Oroville
The Butte County Sheriff's Department on Tuesday lifted mandatory evacuation orders for more than 180,000 people as the California Department of Water Resources continued to stabilize the spillway emergency at Oroville Dam. Sheriff Kory Honea ...