Chris, your septic system is designed for somewhere between 110 and 120 gallons of flow per day per bedroom. (depending on state codes) That is figuring on 2 people per bedroom, 55 to 60 gals per person. So if it is a three bedroom house, it is designed to handle about 350 gallons of effluent per day. Depending on how many bedrooms and how many people are actually in the house you can come up with a pretty good idea of how much the extra 20 gals will push you towards your maximum.
Also, its not water that usually kills a leach field, but it's the solids getting past the tank.
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You'll have to excuse me but I'm running a carbon deficit today.
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