How Often Should You Pump a Septic Tank in Wisconsin?
If your Wisconsin home relies on a septic system, one of the most important maintenance questions is also one of the most confusing:
How often should the septic tank actually be pumped?
You may hear every two years, every three years or every five years. The reality is that there is no single schedule that works for every household.
Tank size, household size, water use and the amount of sludge and scum accumulating inside the tank all affect how often service is needed.
There is also an important difference between Wisconsin's septic inspection requirements and septic tank pumping.
Does Wisconsin Require Septic Pumping Every Three Years?
Not exactly.
Wisconsin's Private Onsite Wastewater Treatment System, or POWTS, maintenance program requires systems to be visually inspected at least once every three years.
However, that does not mean Wisconsin requires every septic tank to automatically be pumped every three years.
Wisconsin Department of Safety and Professional Services guidance explains that an anaerobic treatment tank should be serviced at least when the combined volume of sludge and scum reaches one-third of the tank's volume.
Your county also tracks septic maintenance and may send reminders when your system is due for inspection or service.
That makes the condition of your individual system more important than simply choosing a date on the calendar.
How Often Are Septic Tanks Typically Pumped?
The U.S. Environmental Protection Agency says household septic tanks are typically pumped every three to five years, although actual frequency depends on the system and household.
At Arnold’s, we generally recommend routine septic pumping every two to three years, with some households benefiting from more frequent service depending on occupancy and system conditions.
The best schedule depends on what is actually happening inside your tank.
Rather than waiting for a problem, regular inspection and measurement of sludge and scum levels can help determine when pumping is appropriate.
What Affects How Often Your Tank Needs Pumping?
Several factors can make one household's septic system require service more frequently than another.
Household Size
More people generally means more wastewater and solids entering the septic system.
A home with five or six occupants may need service sooner than a similar system serving only one or two people.
Septic Tank Size
Tank capacity matters.
A smaller tank serving a larger household may accumulate solids more quickly than a larger tank under lighter use.
Water Usage
Showers, toilets, laundry, dishwashers and other everyday activities all send wastewater into your septic system.
Heavy water use can place additional demand on the system. Fixing leaks and spreading laundry throughout the week can help avoid sending unnecessarily large volumes of water into the system at once.
What Goes Down the Drain
Septic systems are designed primarily to handle wastewater, human waste and toilet paper.
Items such as wipes, paper towels, feminine hygiene products, cooking grease and other materials should not be flushed or washed into the system.
Even products marketed as "flushable" may not break down as easily as toilet paper.
Sludge and Scum Levels
Ultimately, what has accumulated inside the tank is one of the most useful indicators of whether pumping is needed.
A septic professional can inspect the system and evaluate sludge and scum levels to help determine whether it is time to pump.
Inspection and Pumping Are Different
This distinction is especially important for Wisconsin homeowners.
A septic inspection evaluates the condition of the system and helps identify maintenance needs.
Septic pumping removes accumulated wastewater, sludge and scum from the tank.
An inspection may determine that pumping is necessary, but the fact that your system is due for an inspection does not automatically mean the tank must be pumped.
Keeping records of inspections and previous pumping can also make it easier to establish a maintenance pattern for your property.
Signs Your Septic System May Need Attention
Regular maintenance should ideally happen before a serious problem develops.
However, possible warning signs include:
Slow-draining sinks, tubs or showers
Toilets draining or flushing unusually slowly
Gurgling plumbing
Sewage odors around the tank or drainfield
Standing water or unusually wet areas around the system
Bright green or spongy grass over the drainfield
Wastewater backing up into the home
The EPA lists many of these as possible signs of a malfunctioning septic system.
These symptoms can have several causes, so do not assume that pumping alone will fix the problem.
If sewage is backing up into your home or you are experiencing another serious issue, contact a septic professional.
What If You Don't Know When Your Tank Was Last Pumped?
This is especially common after buying a home.
Start by looking for:
Previous service invoices
County maintenance records
Inspection paperwork
Information provided when the property was purchased
If you cannot determine when the system was last inspected or serviced, having it evaluated gives you a much better starting point than simply guessing.
Septic Pumping in Southeastern Wisconsin
Arnold's Environmental Services provides septic pumping, inspections, maintenance and repair services throughout Ozaukee County, Washington County and portions of southern Fond du Lac County. Arnold's technicians evaluate sludge and scum levels and can recommend service based on the condition and use of the system.
Staying ahead of septic maintenance is much easier than discovering a problem through a backup or system failure.
Need septic service? Call Arnold's at (262) 675-2497 or see button below.