How often to pump a septic tank in Texas
Summarized from the Texas Commission on Environmental Quality (TCEQ) pages Advice for an Owner of an On-Site Sewage Facility and Maintenance of On-Site Sewage Facilities, and Texas A&M AgriLife Extension publication L-5227, Septic tank/soil absorption field. General information, not professional advice.
The short answer
For a conventional septic system, TCEQ recommends pumping the tank every three to five years. The real interval depends on your tank size and how many people live in the house. Texas A&M AgriLife puts it this way: have the tank cleaned before sludge or scum builds up to the bottom of the outlet device. If too much sludge collects, solids leave the tank with the liquid and can clog the soil, and sewage can surface in the yard or back up into the house. (AgriLife OSSF FAQ)
Years between pumpings, by tank size and household
Find your tank size in the left column and the number of people in your home across the top. The number is the years between pumpings or inspections.
| Tank (gallons) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9+ |
|---|---|---|---|---|---|---|---|---|---|
| 750 | 9.1 | 4.2 | 2.6 | 1.8 | 1.3 | 1.0 | 0.7 | 0.6 | 0.4 |
| 1,000 | 12.4 | 5.9 | 3.7 | 2.6 | 2.0 | 1.5 | 1.2 | 1.0 | 0.8 |
| 1,250 | 15.6 | 7.5 | 4.8 | 3.4 | 2.6 | 2.0 | 1.7 | 1.4 | 1.2 |
| 1,500 | 18.9 | 9.1 | 5.9 | 4.2 | 3.3 | 2.6 | 2.1 | 1.8 | 1.5 |
| 1,750 | 22.1 | 10.7 | 6.9 | 5.0 | 3.9 | 3.1 | 2.6 | 2.2 | 1.9 |
| 2,000 | 25.4 | 12.4 | 8.1 | 5.9 | 4.5 | 3.7 | 3.1 | 2.6 | 2.2 |
| 2,250 | 28.6 | 14.0 | 9.1 | 6.7 | 5.2 | 4.2 | 3.5 | 3.0 | 2.6 |
| 2,500 | 31.9 | 15.6 | 10.2 | 7.5 | 5.9 | 4.8 | 4.0 | 3.5 | 3.0 |
Source: TCEQ, Advice for an Owner of an On-Site Sewage Facility. AgriLife adds that you will need to pump more often if you use a garbage disposal, because ground food adds solids to the tank.
Not sure what size tank you have?
The best answer is the permit file at your county or local permitting authority, which shows the design size. See our East Texas septic permits page for the office that covers your county. If there is no record, AgriLife lists these Texas minimum tank sizes for homes:
| Bedrooms | House size | Minimum tank |
|---|---|---|
| 1 or 2 | under 1,500 sq ft | 750 gallons |
| 3 | under 2,500 sq ft | 1,000 gallons |
| 4 | under 3,500 sq ft | 1,250 gallons |
| 5 | under 4,500 sq ft | 1,250 gallons |
| 6 | under 5,500 sq ft | 1,315 gallons |
AgriLife's worked example: a three bedroom Texas home usually has a 1,000 gallon tank. With four people living there, pump about every 2.6 years. With two people, about every 5.9 years. Skipping a pumping will not make the drain field fail right away, but the tank stops protecting the field from solids. (Source: L-5227, Tables 1 and 2.)
Aerobic systems follow different rules
Many East Texas homes have aerobic treatment units with sprinkler heads. For these, TCEQ says pumping depends on the depth of sludge and the manufacturer's recommendations, and AgriLife says an aerobic unit typically needs pumping every 2 to 3 years. A system using secondary treatment or drip irrigation must also be inspected by a maintenance company once every four months, or maintained by the single family homeowner where allowed. Read our aerobic septic maintenance rules for the details.
Who can pump your tank
TCEQ says to have the tank pumped and cleaned by a TCEQ registered sludge hauler, and AgriLife notes that only people registered with TCEQ may pump and transport septic sludge. TCEQ's maintenance page links to its online database of registered sludge transporters. For licensed maintenance providers and installers near you, browse the county pages on our directory home page.
TCEQ do's and don'ts between pumpings
- Do check toilets for leaks. Add a water based dye to the flush tank and see if it shows up in the bowl within 10 minutes without flushing.
- Do conserve water. Using more water than the system was designed for is one of the common causes of failure TCEQ lists.
- Do not build over any part of the system, including driveways, barns, storage buildings, sidewalks and patios, and do not drive or park on it.
- Do not add chemical additives or enzymes. TCEQ says some of these may even harm the tank.
- Do not use the toilet for tissues, cigarette butts or other trash.
Signs it may be more than a pumping
TCEQ lists the common causes of a failing system as too much water, soil or site conditions that were misjudged when the system was designed, too much food and grease, poor maintenance, and age. If your system is more than 15 years old, TCEQ says it may need to be replaced. Replacing a tank or repairing a drain field needs a permit, though a tank repair that does not require removing the tank counts as an emergency repair that must be reported to the permitting authority within 72 hours.
Buying a home on septic? See our septic inspection checklist. If you also have a private well, AgriLife recommends keeping the septic system maintained to protect your water; our well water testing guide explains what to test.