Cactus Environmental Systems

What They Do

Water DamageMold Testing

• Storage tanks & spill prevention
• Water quality monitoring
• Annual Site Inspections
• Compliance Assistance
• Compliance Planning
• Compliance Services
• Environmental Testing Services
• Leak Detector
• Line Testing
• Monitor Equipment
• Oilfield Services
• Regulatory Compliance
• Regulatory Compliance Assistance
• Regulatory Compliance Testing
• Site Inspections
• Spill Containment
• Systems Installed
• Tank Testing
• Tank Tightness Testing
• Testing And Inspections
• Testing Services
• Three Year Compliance Testing
• Ust Services
• Water Ingress Leak Location And Repair

In Their Own Words

Owned business that started operations in 1989. Our principal objective of the company is to provide quality environmental testing services for owners of underground storage tanks (UST’s). Over the years, Cactus has tested thousands of UST’s and associated piping and has performed thousands of Stage II tests on facilities throughout Texas and surrounding states. Cactus’ home office is located in Houston, Texas. Our clients include major oil companies, industrial companies, governmental organizations, jobbers, convenience stores and service stations. The principals in the company are its founders, President, W.H. Guarniere ("Bill Sr.") and son, W.D. Guarniere ("Young Bill") VP of Operations. We, with our employees, have remained dedicated...

Written by the business on its public profile. We have not verified these claims.

Before You Call Cactus Environmental Systems

1. Do you take moisture readings every day and will you give me the drying log?
2. Are your technicians certified in water damage restoration?
3. Do you also do remediation? If so, who checks your work?
4. How many air samples will you take, and will you take an outdoor control sample?

For mold jobs of 25 contiguous square feet or more, ask for a Texas mold remediation contractor license and look it up with the Texas Department of Licensing and Regulation. Also ask for proof of insurance and industry certification for the technicians.

They list no storefront. Ask where the business is based and whether the crew is their own.

How Their Reviews Break Down

Counts from public listings as of September 23, 2026. A handful of reviews says less than a few hundred.

Read This While You Wait

• DIY with careWhat to Do in the First 24 Hours After Water DamageAn hour by hour plan for the first day after water damage. Make it safe, stop the source, document, remove water and start drying before mold can start.
• Call a proMold Testing, When It Is Worth It and How to Read a Lab ReportWhen a mold test is worth paying for, which kind to ask for, why store kits mislead, and how to read spore counts, outdoor controls and a lab report yourself.
• DIY friendlyWasher, Dishwasher, Fridge and Toilet Supply Line LeaksHow washer hoses, dishwasher lines, ice maker tubing and toilet supply lines fail, how to clean up each kind of leak, and how to replace a line yourself.
• DIY with careAttic Mold on Roof Sheathing, Causes and FixesWhy mold grows on attic roof sheathing, how to find the cause, the fixes that stop it for good, and how to tell a cosmetic stain from a roof that needs work.