Subsurface division is a part of DES but not completely affiliated with CSPA. Typically if you have a system failure you do not need to redesign the system but a note will be made on the existing plan on file to note that a replacement according to the pre-existing standards was performed. You did not state weather it was a leach field failure, septic tank failure or a failure of any connecting pipes. There is a big different in how you would proceed with a repair and what you would need to do.
First step is go to the town and review your property file and determine that you have a current septic design on file, verify that it is current to the homes current status, i.e. it is a three bedroom design and your home is three bedrooms or less. Do not attempt to add a bedroom to the septic system and play it off as a replacement of an existing system in kind, you will not like what will happen to you and most if not all contractors doing the work will not do this for you.
If you are able to replace in kind and are not planning on adding anything you should be grandfathered as to location and size, the state may ask that you replace with a more efficient system of leaching to get you as close as possible to the current regulations. But they will typically not require this.
If all your information is current and you truely do have a failure (verified by a septic inspection report) you can typically deliver the report and system design on file to the town and state. A phone call will typically surfice, but have the information in case they request it (just do to proximity to water).
You will not have any issues with CSPA as this has nothing to do with changes within the buffer zone, i.e changes of loading on the system. If you are planning on adding additional space at anytime in the future, now is the time to bring your system up to snuff, which will require a new design and subsurface approval through the state. Both of these things are typically handled by your septic designer/installer.
If you decide to upgrade the system and need info on a designer, send me a PM, I have a local contact that is a retired state subsurface engineer that still does septic designs to keep busy, very reasonable.
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