Can I use my old drainfield later once a new one is installed?

In most cases, Yes.

If the old drainfiled was sized appropriately to its current use and there is at least 3 feet of suitable soil as described earlier, then the owner will be able to switch between the two drainfields by means of a diverter valve.  It has been estimated that within a
few years, and old ponded drainfields can recover much of its infiltrative capacity.  For homes constructed after 1977 and having a below grade drainfield, a future-replacement area will have already been designated.  Once a replacement drainfield is installed the original drainfield will be allowed to rest and rejuvenate.  Switching may occur every 1 to 5 years. Your WOWRA member contractor will help you determine the proper time and method for switching drainfields.

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