Terra-Petra Environmental Engineering

Terra-Petra Environmental Engineering In heavily populated areas such as Los Angeles, where parking space is at a premium, our designs nearly always include below-grade waterproofing and drainage.

Terra-Petra provides environmental engineering and waterproofing consulting, testing, design, inspection services for methane, brownfield, vapor intrusion, oil fields, radon, and more. Terra‑Petra specializes in environmental soil and soil gas characterization and remediation; and in the design and inspection of soil gas mitigation systems for buildings of all types—including commercial, multiple

-family, single-family, industrial, institutional and retail. We make it our business to understand any specific project “challenges” from the beginning, to ensure that we engineer “sustainable systems” for our clients. Terra‑Petra takes pride in our understanding of the construction processes, thus allowing us to design the most cost-effective systems for any building and budget.

As we welcome 2026, we’re grateful for our partners, clients, and communities.Who share our commitment to responsible en...
01/01/2026

As we welcome 2026, we’re grateful for our partners, clients, and communities.

Who share our commitment to responsible environmental solutions.🎉

Here’s to a new year of innovation, sustainability, and progress.

Happy New Year from all of us at Terra-Petra Environmental Engineering.💫

On Veterans Day, Terra-Petra Environmental Engineering honors one of our own — John Conaway, a former civil engineer who...
11/11/2025

On Veterans Day, Terra-Petra Environmental Engineering honors one of our own — John Conaway, a former civil engineer who proudly served our country in Vietnam.🪖

John brought his deep field experience, integrity, and steady leadership to the Terra-Petra team, helping shape projects that continue to protect people, buildings, and communities.

Thus, his service to our nation did not end when he returned home — it evolved into service to the environment, to public health, and to the industry as a whole. ❤️

We thank John for his courage, sacrifice, and unwavering commitment to making the world safer — both in uniform and in the field.🤍

Today, we honor Veterans like John who have served with strength, resilience, and heart.💙

Your legacy continues through the work we do every day.🇺🇸

Happy Veterans Day.

Terra-Petra attended the Environmental Law Section of the California Lawyers Association Environmental Law Conference in...
10/23/2025

Terra-Petra attended the Environmental Law Section of the California Lawyers Association Environmental Law Conference in Yosemite last weekend. Thank you to everyone involved it was a great event!

Happy Hollidays EVERYONE! 🎄🎉We celebrated at our annual Holiday Party on December 14th at Trevor's At The Tracks in San ...
12/18/2024

Happy Hollidays EVERYONE! 🎄🎉

We celebrated at our annual Holiday Party on December 14th at Trevor's At The Tracks in San Juan Capistrano, and it was a wonderful evening! It was a beautiful setting with great food, and fantastic music provided by The Ashe Brothers (our official 🏠band!). Thank you to all who came out to celebrate with us!

Click the link below to view the photo gallery from the event:

https://terra-petra.com/terra-petras-annual-holiday-party-a-night-of-great-fun-and-celebration/

This Thanksgiving, we're filled with gratitude for our amazing team, valued clients, and partners who make everything we...
11/27/2024

This Thanksgiving, we're filled with gratitude for our amazing team, valued clients, and partners who make everything we do possible. 🍁✨

As we reflect on this season of thankfulness, we're reminded of the strength of our collaborations and the impact of our shared work.

From all of us at Terra-Petra, have a wonderful Thanksgiving! 🥂

Happy Veterans Day. 🇺🇸 Today, we proudly honor Terra-Petra's Original Engineer, John Conaway, who courageously served ou...
11/11/2024

Happy Veterans Day. 🇺🇸 Today, we proudly honor Terra-Petra's Original Engineer, John Conaway, who courageously served our country in Vietnam. Though he is no longer with us, his unwavering dedication and bravery continues to inspire us all. We express our gratitude as we honor all of our veterans.

Happy Veterans Day! 🇺🇸 Today, we proudly honor John Conaway, Terra-Petra’s Original Engineer, who courageously served ou...
11/11/2024

Happy Veterans Day! 🇺🇸 Today, we proudly honor John Conaway, Terra-Petra’s Original Engineer, who courageously served our country in Vietnam. Although he is no longer with us, his unwavering dedication and bravery continue to inspire us all. We express our gratitude as we honor all of our veterans.


Terra-Petra represented at the first two games of the World Series. LET’S GO DODGERS!.💙💙💙
10/28/2024

Terra-Petra represented at the first two games of the World Series. LET’S GO DODGERS!.
💙💙💙

We’re proud of Terra-Petra Vice President and General Manager Justin Conaway for giving an awesome presentation and bein...
10/24/2024

We’re proud of Terra-Petra Vice President and General Manager Justin Conaway for giving an awesome presentation and being recognized as a contributor to this year’s AVIP V***r Intrusion Conference.
It was a great show, and we were so happy to connect with both familiar faces and new colleagues in the industry.
***rintrusion

Great presentation by Terra-Petra’s own Justin Conaway today. Day 3 of the AVIP VI Conference. Justin discussed the c...
10/23/2024

Great presentation by Terra-Petra’s own Justin Conaway today. Day 3 of the AVIP VI Conference. Justin discussed the criteria for choosing a membrane for v***r intrusion mitigation system design. Thanks to all who were in attendance! . . .
***rintrusion

Good friend and business partner William Stetson of Edgeboro out from New Jersey to attend the AVIP V***r Intrusion Conf...
10/22/2024

Good friend and business partner William Stetson of Edgeboro out from New Jersey to attend the AVIP V***r Intrusion Conference.

Closed cell foam performs better than opened cell foam. Some great demos at the AVIP VI Conference today.
10/22/2024

Closed cell foam performs better than opened cell foam. Some great demos at the AVIP VI Conference today.

Address

700 S Flower Street Ste 2580
Los Angeles, CA
90017

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

Telephone

(213) 788-3564

Website

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