Septic questions, answered for Wichita and south-central Kansas.

Every one to three years for most households, depending on how many people live in the house. That’s Mosley’s rule of thumb, and it matches K-State’s pumping table.

K-State’s numbers for a 1,000-gallon tank: about 5.9 years for two people, 3.7 for three, 2.6 for four and 1.5 for six. Use a garbage disposal and you should cut the time between pump-outs by about a third.

The best schedule comes from the tank itself. When we pump, we can tell you whether it was due, overdue or could have waited.

Usually 1,000 gallons or more. In Kansas a 1,000-gallon tank is the recommended minimum for a three-bedroom home, and where no county code applies, KDHE’s minimum standard is 1,000 gallons.

Older homes, especially on older acreages, can have smaller tanks, which fill faster. If you don’t know your tank size, we can tell you after a pump-out.

It holds the household wastewater long enough for solids to separate: heavy solids sink as sludge, grease and light material float as scum, and the clearer water in the middle flows on to the field or lagoon.

Bacteria break down some of the solids, but not all of them. What’s left builds up until it’s pumped. If it isn’t, solids eventually flow out with the water and plug the field.

Because that’s the only way to get the sludge out. K-State’s guidance is to pump through the large manhole, not the small inspection ports, which can damage the baffles and leave solids behind.

A good pump-out mixes the sludge and scum into the liquid so the whole tank empties, not just the water on top.

It depends on the tank size, how far it is, how hard the lid is to reach and whether it’s an emergency. Call (316) 777-4000 for a price for your place.

One Wichita-area customer wrote in a January 2026 Google review that their whole tank was pumped for $250. That’s one job, not a price list: buried lids, larger tanks and after-hours calls change the number.

No. K-State’s bulletin warns that if an additive does break solids down, it can push more material out into the field and hasten its failure.

A normal household already supplies the bacteria a tank needs. Pumping on schedule is what protects the field.

A rotten-egg smell, slow drains all over the house, gurgling pipes, water pooling over the tank or field, a strip of grass that’s greener than the rest, and sewage backing up. Those are the six signs Mosley lists.

One sign on its own can be a plumbing clog. Several at once, especially slow drains everywhere plus gurgling, usually point to the tank or field.

Stop using water, keep people and pets out of the area, and call (316) 777-4000. Sewage is a health hazard.

Don’t run the washer, dishwasher or showers, and don’t flush. Every gallon you send down has nowhere to go but back up. Don’t open the septic tank yourself.

Wash skin and clothes that touch sewage, and keep children away from the wet area until it’s cleaned up.

Don’t lean into an open septic tank, and never go in one. Septic gases such as hydrogen sulfide and methane, and the lack of oxygen, can kill in minutes, and they often kill the person who goes in to help.

Keep lids secured with screws or locks, keep children and pets away from open or damaged lids, and leave the inside of the tank to a pumping crew.

Yes. Mosley’s own site has offered “24/7/365 same-day service,” and reviewers describe the crew reaching a backed-up tank at 8 pm. Call (316) 777-4000 any time and say it’s an emergency.

Saturated ground. When the soil around the field is full of water, the field can’t take any more, so the water level rises in the tank and the lines. Gurgling and odor follow.

Spread out laundry and baths for a few days, keep downspouts and sump water away from the field, and call if it doesn’t clear when the ground dries. If it happens every spring, the tank may be overdue or the field may be failing.

If one fixture is slow, it’s usually that fixture’s drain. If everything is slow or the lowest drain backs up, it’s the main line or the tank.

A tank that’s at its normal level with a backup in the house points to a clog in the line before the tank. Roots are common. That’s a job for an auger or hydro jetter, not a pump truck.

Both start with a septic tank. With a septic field (lateral field), the water from the tank soaks into the soil through buried perforated pipe. With a lagoon, it flows into a shallow fenced pond where sun and wind treat it.

Fields cost less to build and take less room. Lagoons need space (at least five acres in unincorporated Sedgwick County) and suit heavy clay soils that won’t take water.

Because so much Kansas ground is clay that soaks up water too slowly for a field. Sedgwick County, for example, treats soil that percolates slower than 60 minutes per inch as lagoon soil.

A lagoon doesn’t rely on the soil to absorb the water, so it works where a field would fail, as long as the lot is big enough.

Yes. Sedgwick County’s standards call for a 1,000-gallon septic tank ahead of the lagoon. That tank catches solids just like any other and needs pumping on a schedule.

Skip it and the solids go into the lagoon, where they build sludge, cut the water depth and invite weeds.

Mow the berm short, keep the water deep and keep trees and weeds out. MABCD’s guidance is grass under 6 inches, at least 3 feet of water, 18 inches of water above the sludge and no trees within 50 feet.

The lagoon must be fenced, and the fence kept in repair so children and animals can’t get in. Muskrats and roots damage berms, so deal with both early.

Clay that swells when wet and shrinks when dry is hard on drain fields. In a wet spring it seals up and the field drains slowly; in a dry summer it cracks.

The movement can also shift old tanks and pipe joints. Pump on schedule so no solids reach the field, keep surface water off it, and don’t drive or park on it.

It can, though it’s not common in a system that’s used every day. Freeze-ups usually happen where snow cover is thin or packed down over the lines, where a line is shallow, or when a house sits empty.

Don’t drive or plow over the tank and field in winter, leave grass and snow cover in place, and fix dripping fixtures that trickle cold water into the lines. If drains stop in a cold snap, call. Don’t build a fire or pour antifreeze into the system.

Use as little water as possible until the ground drains, and don’t pump the tank while the ground is still saturated, because a nearly empty tank in wet soil can shift or float.

Once the water goes down, have the system checked. Floodwater can carry silt into the tank and field. If you have a private well, don’t drink the water until it’s been tested; use bottled water and follow the county health department’s advice.

Counties, mostly. KDHE sets the state’s minimum design standards (Bulletin 4-2), and counties adopt sanitary codes that permit, inspect and license the work. Around Wichita that’s Sedgwick County’s MABCD and Butler County under its sanitary code.

Cities with sewer handle their own connections. Systems that discharge to surface water need a KDHE permit.

Yes. Any work beyond routine maintenance, from minor repairs to full replacement, needs a permit, and in Sedgwick County a licensed wastewater installer has to pull it.

Pumping doesn’t need a permit. For new construction, MABCD issues the wastewater permit before it will issue a building permit. MABCD: (316) 660-1840.

We haven’t found a Sedgwick County rule requiring one at sale. But many buyers, lenders and loan programs ask for a pump-out and inspection, and it’s smart to have one either way.

Ask your agent and lender what they need early, so a pump-out and inspection can be scheduled before closing. If you’re unsure about current county rules, call MABCD.

Not automatically. Butler County’s sanitary code lets the owner or contract buyer request a courtesy inspection when a property is for sale, and the county issues a certificate with the results.

The county is clear that its courtesy inspection is not a warranty. A pump-out lets everyone see the tank’s real condition.

Ask when the tank was last pumped, how big it is, whether it’s a field or a lagoon, where the lids are, and whether there have been any repairs or permits. Then have it pumped and inspected before closing.

Watch for soggy spots, odor and very green strips over the field. In lagoon systems, look for trees, cattails and low water.

No. Sedgwick County requires every wastewater system to be installed by a licensed wastewater installer, and only a licensed installer can pull the permit.

Soil testing for new construction must be done by a qualified professional in the area where the system will go.

Grease and cooking oil, coffee grounds and eggshells, wipes and tissues, cat litter, feminine products and condoms, paint, solvents, pesticides and harsh chemicals. That’s close to the list Sedgwick County publishes.

Toilet paper and human waste are what a septic system is built for. Everything else either won’t break down or harms the bacteria.

Yes. Caustic drain cleaners can harm the bacteria in the tank, damage pipes and still leave the clog. Mosley clears septic lines with augers and hydro jetting, which uses water instead of chemicals.

Pump on schedule, save water and spread it out. Sedgwick County’s list: fix leaks, use water-saving fixtures, spread laundry across the week and spread water use across the day.

Keep downspouts and runoff away from the field, keep cars and heavy equipment off it, and replace broken baffles with sanitary tees when the tank is pumped.

Start at the house: find where the main sewer line leaves the foundation, then look in that direction, usually 10 to 25 feet out, for a low spot, a patch where snow melts first or grass grows differently.

County permit records may show the layout. Or call us and we’ll locate the tank and dig to the lid. Once it’s found, a riser to grade means you never dig again. Don’t open the lid yourself or leave it open.

It’s worth it. K-State recommends risers to within 12 inches of the surface, and Sedgwick County’s lagoon standards call for risers to grade on the tank.

Risers make every pump-out quicker and cheaper. They must have secure lids that children can’t open.

Keep it to grass. Don’t build, pave, park or set a pool or shed over the tank or field. The tank needs access, and the field needs air and sunlight to work.

Keep trees and big shrubs away. Roots find the lines and the tank.

Ask the county. In Kansas, onsite wastewater installers are licensed at the county level under county sanitary codes, so call MABCD in Sedgwick County ((316) 660-1840) or Butler County to confirm an installer’s license.

K-State’s advice is to choose a pumper licensed by the local agency who disposes of septage legally and keeps good records. Ask about insurance too.

Wichita and Sedgwick County, and Butler County, including Haysville, Mulvane and El Dorado. Mosley’s site names Wichita, El Dorado and Haysville and says “and more.”

Not sure if you’re in range? Call (316) 777-4000.

Mosley describes itself as licensed and insured: “Our experienced team includes licensed septic installers, and a master drain layer all properly licensed & ready to serve you.”

You can confirm any installer’s license with the county where the work is being done.

Mosley Services was formed by combining three local septic companies: Sunflower Septic, Mulvane Septic and Mosley Septic. It’s family owned and operated and based in Wichita.

Yes. Grease trap cleaning is one of Mosley’s services for restaurants and commercial kitchens. Call to set up a schedule or a one-time cleaning.