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The best way to keep a septic tank clean is to hire a local septic tank cleaner to inspect and pump the septic tank every three to five years. Be sure to only flush human waste and toilet paper down the toilet, and don’t pour grease, oil, fats, coffee grounds, or food scraps into your drains.

Your septic tank naturally contains the good bacteria it needs, so you typically don't have to add more as the system produces them on its own. However, if you wish to replenish the bacteria, you can use natural methods. For example, you can add three rotten tomatoes to your garbage disposal or flush 1/4 ounce of active yeast down the toilet every three months. While store-bought septic enzymes and chemicals are available, many additives are unnecessary and may even harm your system. The most effective way to maintain a healthy bacterial balance is to avoid using chemical drain cleaners, which can kill the beneficial bacteria in your tank.

The average cost to pump a septic tank is around $550, though prices can range from $250 to over $1,250. The final cost depends on several factors, including the size of your tank, how full it is, and your geographic location. For example, pumping a small tank might cost between $290 and $530, while a larger 1,750-gallon tank could cost $600 or more. Prices also vary by region; for instance, costs in Minneapolis range from $175 to $275, while in Portland, they can be between $440 and $750. Regular pumping is essential to prevent waste buildup, which can lead to backups and damage to your drain field.

Septic tanks appear full after pumping because the liquid levels have returned to normal. If you can see the pipe, the tank is empty. However, heavy rain can cause septic tanks to fill faster than normal. You might also have leaky pipes or faucets, causing extra water to drip down the drains and into the septic tank.