ANNUAL FLUSHING PROGRAM

     The annual flushing program is done in early spring. The Department will publish the area and times in a local newspaper and local radio station. Flushing of the water mains may cause discoloration to the water. 

Why do we Flush? 

     Historically routine flushing was done to improve the aesthetics of the drinking water within a distribution system.  Accumulation of sediment in the piping system, especially in low flow areas must be removed under controlled conditions.
     If the supplies have high iron and or manganese, these elements may precipitate out of solution and settle in the bottom of the piping system and should be removed.  Corrosion by products may also accumulate in the bottom of the piping system, and must be removed.
     Routine flushing of the distribution system will reduce the accumulation of sediment in the bottom of the piping system, reducing the habitat available for bacteria to grow.
     Flushing will also remove the loose biofilms that may create a problem through sluff off during high demand periods.

When do we Flush?

     Routine flushing at the correct time of year is of the utmost importance.  Flushing should be accomplished prior to the expected period of microbiological or aesthetic degradation of water quality.  This recommended period is normally in the spring, once the weather improves and prior to elevated water temperatures and high demand periods.
     Review of historic records of water quality complaints can give an indication of the most advantageous time  to flush for specific systems.
     Review of water quality records, especially coliform presence within the distribution system, may provide the information necessary to determine the most advantageous period for flushing.
    They Key is to flush "prior to" the problem "not after" it is experienced.