our team


Sarah Pistone, CEO of Horizon Designs LLC, has a diverse background rooted in Earth Science and Engineering Disciplines. Early in her career, she completed a BA in Geology from Smith college and then worked as an environmental consultant on soil and groundwater contamination and remediation projects.  Later, she returned to academia to obtain a MS in Energy Resource Engineering from Stanford University.  Since then, she has worked as a Reservoir Engineer and a Steamfield Engineer in the geothermal power industry.  Sarah has experience with the following:

  • designing new piping systems as well as modifications and repairs to existing installations.  
  • GPS data collection and mapping to locate existing features or plan new developments.
  • designing and building data collection and analysis tools.  Custom VBA-enhanced Excel tools that are robust and user-friendly as well as training on how to use them.
  • ​project management and design implementation

Bill Lincoln, Managing Partner of Horizon Designs LLC, has extensive experience in the agricultural engineering industry.  

If you look closely at some of the finest wineries  and cattle ranches in Napa, Sonoma, or Lake  Counties in Northern California, you’ll not see Bill Lincoln’s name on any sign post. What you will see are professionally engineered vineyards, pastures, and complex irrigation systems that are working to help make their owners successful. That’s the sign that Bill Lincoln has been there.

As a former grape grower, farmer, and farm  equipment expert, Bill’s expertise is as deep as  the earth in which he works.


He holds the following qualifications:

  • CPESC (Certified Professional in Erosion Sediment Control)
  • QSD (Qualified Stormwater Developer) 
  • QSP (Qualified Stormwater Practitioner — Inspections)
  • Long-time member of IECA
  • Irrigation—Design, Construction, and Maintenance
  • Permit writing and implementation