About Us


Sentinel Environmental Solutions is a licensed environmental business, keenly focused on methane mitigation and the relief of other gases found throughout California soil and construction sites. We are quickly rising to the top of our field because of our strong customer service and satisfaction approach.

Daniel Treptow, our CEO & Founder, is often found in the field with his handpicked and trained installers, making sure each of the factors in a mitigation system is not only built to the precise design, but on time and on budget as well.

While others may use whatever supplies and equipment they can find, we use only the highest quality supplies and equipment available in the industry. As a result, you can rest assured of an on-time delivery of the highest quality, best valued product.

As much as implementing the mitigation system correctly is important to us, we also value installing it on time. Because sticking to schedule is so crucial in our industry, we also offer engineering services for any real-time changes that may be required to make sure all methane mitigation tasks are performed within the set time-frame. We accept and thrive on that great responsibility, but more importantly, we enjoy doing it.



Daniel graduated with honors and a degree in Business Administration from California State University Northridge in 1989. After school was over, he began leading manufacturing and construction companies within a wide range of fields, and gained valuable skills as a result. 15 years ago, however, Daniel saw a growing need for environmental relief, and therefore began to focus on the Methane Zone and methane mitigation requirements.

DANIEL TREPTOW, Sentinel Environmental Solutions Methane Mitigation Master


Our goal is to provide you with the highest value in the industry. As a result, we strive to offer the best quality products and services at the lowest costs.



Superintendent / Hathaway Dinwiddie

(213) 215-8785


Superintendent / Farwest

(760) 272-7518


Engineer, Inspector / GeoScience

(805) 526-6532


Deputy Inspector / Brownfield Subslab

(562) 631 -0579

CALL US NOW AT +1 (805) 402-4037