In general...
You can repair and maintain grandfatherred installations as long as you don't substantially alter the infrastructure that interacts with those features. If you reduce the 'load' from a 4 bedroom house to a 2 bedroom house you will probably pass through the permitting process without difficuly, if your current system is appropriate for a 2 bedroom system. If you decided later to adjust back to a 4 bedroom facility you will need a variance or may be required to upgrade the system if possible. Approval is not guaranteed.
Some items, like septic systems, may require that you bring them up to current code if/when they need major maintenance. For example: If you use a leach-tank instead of a leach field. People use to just cover these over with timber and dirt. Youare not required to dig them up and replace the cover with metal until the timbers fail or you dig it up to clear the silt out of it. You will able to retain that facility even if leach-tanks are no longer up to code for new installations.
That's all I think I know about that...
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