I'm having a slow leak into my septic tank. I had it pumped today and see the water dripping. It's a slow but constant drip. Here's what I've done so far to trouble shoot.
1. Checked all toilets: None running. I turned off all water valves to tanks and even sucked water out of tanks to make sure there was none seeping under flapper valves.
2. Checked all faucets- no leaks.
3. Turned off main water valve at hot water tank and checked meter at the street. Meter was not running so I'm guessing the leak if from inside the house.
4. The only thing I can think of is that its coming from the hot water heater since its under pressure. Could this cause a slow leak even if water is turned off to toilets? I realize the hot water does not run to the toilets but would the pressure from the tank cause a leak into the septic tank? Could the small expansion tank that is attached to the top of water heater cause the leak issue?
5. I opened the relief valve on the water heater to see if this would stop the drip-no luck.

Any suggestions on what to check next would be a HUGE help!

Dripping into the tank via the line from the house? I would not worry about a slow drip, your tank can handle that. I think all of your traps are just allowing some excess water into the line. Traps are not stagant and can let loose a bit of water if wind blows across your vent stack or air pressure inside the home changes. Do you have a clean out immediately inside or outside the house?

Thanks for the response. The clean out is right outside the home. The problem Im having is once the tank is full the drain field isn't handling the water. If it's a constant and steady drip 24/7 then my drain field is constantly saturated. Ive had tank pumped 3 times in the past year and each time the septic guy has said I apparently have a leak. I had them check to see if there was damage to the drain field and they said they thought it was from the leak, again constantly keeping the drain field saturated. Im just trying to trouble shoot all possibilities before I get into adding additional chambers to drain line.

Open the cleanout to see of there is a flow of water. Plus the pipe with an oily rag and see of the trip stops.