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Our goal is to instill confidence through technical competence applied with integrity


We will:

  • Listen to understand the needs and expectations of our clients

  • Evaluate the condition and nature of the raw water source

  • Analyze in detail the chemistry of the water 

  • Outline and explain clearly technical options

  • Provide prompt detailed proposals and estimates

  • Adhere to estimates and budgets

  • Be available and responsive to our clients' questions

  • Communicate by phone, email, text messaging and personal site visits




Petersen-GPM was formed when Matt Petersen, of Les Petersen Drilling & Pump, purchased GPM Well Testing from Earl and Linda Sheridan of Sebastopol in June of 2013. Matt's vision for Petersen-GPM was to incorporate water conditioning services with the exisiting well testing aspects of the business. Petersen-GPM adds to the legacy of Les Petersen who founded the drilling and pump operation in 1946.

Matt Petersen has been involved in the well drilling and pump business his entire life. Matt's grandfather, Les Petersen, started Les Petersen Drilling & Pump Company in 1946.  Les passed the baton to Ray Petersen, Matt's father, who continued to advance the business.  Matt is the third generation continuing the legacy that was started over 65 years ago.  

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