“Attention DPU customers, please be advised that there are salesman in many area neighborhoods who are representing themselves as affiliated with DPU, and are trying to sell solar panels.  DPU has not contracted with any outside source for the promotion of solar power.  DPU believes that solar power is a very important renewable energy source, and is proud that a component of the energy purchased by DPU is generated by solar.  We advise all customers to fully investigate any solar company before purchasing, and if there are any questions, please call our electric division at (803) 268-4204.  DPU, your hometown utility source since 1898.”

Water Backflow Requirements

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Safeguarding our public water system is an essential part of our mission to protect public health. 

 Each connection on our system, residential homes and commercial businesses, present an opportunity for contaminated water to enter our water system.  Without the use of backflow preventers, water from private systems, such as industrial plants, and medical facilities, could enter our system, and impact the water quality.

 To protect our system, DPU has a backflow prevention program that is strictly monitored and enforced. 


 What is backflow?

Backflow is the reversed flow of non-potable water or other substances into the public water system.  It is caused by a drop in pressure in the public water system.

 Who is required to have a Backflow Preventing Device?

Since backflow hazards are determined by the type of business, and how water is used, we evaluate each account on an individual basis.  The types of accounts that require a backflow preventer are:

  • Restaurants
  • Dry Cleaners
  • Medical Offices
  • Funeral Homes
  • Beauty and Nail Salons
  • Car Washes
  • Multi-tenant Retail Space
  • Commercial Buildings 3 stories or taller
  • Commercial Space with a Dedicated Fire Service Line/Sprinkler System
  • Churches with Baptismal Pools
  • Irrigation systems

  Click here to download our complete Backflow Device Requirements