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Properly Maintain Your Septic System- According to the US EPA. Groundwater can be contaminated by poorly or untreated household wastewater, which poses a danger to drinking water and the environment. Malfunctioning septic systems release bacteria, viruses, and chemicals into local aquifers and waterways. The average household septic system should be inspected at least every three years by a septic service professional. Household septic tanks are typically pumped every three to five years. Alternative systems with electrical float switches, pumps, or mechanical components should be inspected more often, generally once a year. Find more information on the US EPA webpage:...