Not talking about the bacterial aspect. Flat out dumping too much of any excess water into your tank isn't good for it. Also odds are if your water is chlorinated, you're probably on a public sewer service as well.
Excessive water is a major cause of system failure. The soil under the septic system must absorb all of the water used in the home. Too much water from laundry, dishwasher, toilets, baths, and showers may not allow enough time for sludge and scum to separate. The less water used, the less water entering the septic system, resulting in less risk of system failure.
Long story short, your leach field gets plugged up and all that water starts coming back up out of the lower most drains in your home. Then you'll need your leach field redone.