Serving Northern Virgina / Washington DC Metro Area Customers Since 1987

Onsite Septic System Design

Once the soil evaluation is complete its time to design your onsite sewage system. There are many choices in today's septic system world and helping you find the right system for your application is our number one priority.

Things to consider are value, which is different from cost, aesthetics, required maintenance, operating expenses and long term service requirements.

The right system for you as an individual homeowner may be different than a custom or semi-custom builder with many lots. SES engineers and staff have years of experience designing and installing septic systems. Let our expertise in all types of systems guide you down a path you'll be satisfied with now and for years to come.

SES Company


  • Virginia Onsite Wastewater Recycling Association
  • National Onsite Wastewater Recycling Association
  • Water Environment Federation
  • Virginia Association of Counties
  • Northern Virginia Building Industry Association
  • Design Build Institute of America
  • Better Business Bureau
  • Dulles Area Realtors Association
  • Prince William Regional Chamber of Commerce

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Responsible Management Entity

SES is one of only three businesses to be licensed as a Responsible Management Entity. Loudoun County Virginia was the first in the Nation to establish requirements for an RME based on EPA recommendations. SES manages several communities required to have an RME.

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  • Licensed Conventional & Alternative Onsite Soil Evaluators (AOSE)
  • Licensed Conventional and Alternative Onsite Sewage System Operators
  • Licensed Conventional and Alternative Onsite Sewage System Installers
  • NSF Certified Septic System Inspectors
  • Virginia Class A Contractors License
  • Environmental, Monitoring Well and SDS Endorsements
  • Licensed Sewage Handler
  • Licensed Wastewater Treatment Plant Operators
  • Licensed Water System Operators

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