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Whether or not it’s hard to pass a perc test depends a lot on the composition of your soil. When a perc test is conducted where there’s a high concentration of sand in the soil, perc tests almost always pass. However, if your ground is dense clay or rock, it may prove difficult to pass a perc test. A low water table also helps you pass the test, as a high table means your yard isn’t draining water as efficiently.

Some of the biggest symptoms of a drain field failure include a foul stench, backed-up toilets and drains, and mushy grass or standing water on top of the drain field. Also, if the grass above your leach field starts suddenly growing faster and looks thicker or healthier than the rest of your lawn, it could be a sign that it isn’t getting rid of waste properly.

You should pump your septic tank once every two to four years for a family of four, depending on your septic tank size. You should pump a 1,000-gallon septic tank every two years, while a 1,500-gallon tank should be pumped every four years. Water usage also affects how often you should pump your septic tank. If you notice slow drains, foul smells, or gurgling sounds from your drains, you should pump your septic tank as soon as possible.

Your septic tank naturally contains the beneficial bacteria it needs to function, so you typically don't need to add more. However, if you wish to replenish the bacteria, you can use natural methods. For example, you can add three overripe 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 experts consider them unnecessary and potentially harmful. The most effective way to maintain a healthy bacteria population is to avoid using chemical drain cleaners, which can kill the good bacteria in your system.