How Often Must a Texas Aerobic System Be Pumped?

Texas does not set a pumping interval for aerobic or any other on-site sewage facility (OSSF). The rule is 30 TAC §285.39(b): “Owners shall have the treatment tanks pumped on a regular basis in order to prevent sludge accumulation from spilling over to the next tank or the outlet device.” The same sentence settles who may do the work: owners “shall engage only persons registered with the executive director to transport the treatment tank contents,” which means a waste transporter registered with TCEQ. So the trigger is the sludge level, not a date, and the duty sits with the owner. On an aerobic system the maintenance provider sees the tank at every visit: sludge condition is an inspection item on the state’s model report, Figure 3 (30 TAC §285.90(3)). A provider who records a rising level, and tells the owner, gives the rule what it depends on.

Summarizes public rules as of Oct 14, 2026; not legal advice; verify with your permitting authority.

What does the rule say?

30 TAC §285.39 is titled “On-Site Sewage Facilities Maintenance and Management Practices.” Its paragraph (b) reads in full:

“Owners shall have the treatment tanks pumped on a regular basis in order to prevent sludge accumulation from spilling over to the next tank or the outlet device. Owners of treatment tanks shall engage only persons registered with the executive director to transport the treatment tank contents.”

Paragraph (a) puts a duty on installers to give the owner “written information regarding maintenance and management practices,” and paragraph (c) bars driveways, storage buildings or other structures over the treatment or disposal systems. The section has not been amended since April 28, 2004.

Who does what?

Duty	Who	Rule
Have the treatment tanks pumped on a regular basis	Owner	30 TAC §285.39(b)
Haul the tank contents away	A transporter registered with TCEQ	30 TAC §285.39(b)
Record sludge condition at each maintenance visit	Maintenance provider or technician, on the visit report	30 TAC §285.90(3), Figure 3
Say in the contract whether pumping is included	Owner and provider, in the contract’s list of covered items	30 TAC §285.7(d)(1)(A)
Give the owner written maintenance information	Installer	30 TAC §285.39(a)

How do you know when a tank needs pumping?

The rule names the outcome to prevent, sludge “spilling over to the next tank or the outlet device,” rather than a measurement. In practice the answer comes from looking: the sludge-condition entry on each Figure 3 report is the record of how fast it is building. Three visits a year on a surface-application system (30 TAC §285.91(4), Table IV) give three readings a year, which is enough to see the trend well before a tank fills.

For planning before there is a history, published extension tables estimate years between pumpings from tank size and household size. The septic pumping-frequency estimator uses the Ohio State table republished by the University of Arizona. It is an estimate for a conventional septic tank, not a Texas rule; a measured sludge level takes precedence.

Is pumping part of the maintenance contract?

Only if the contract says it is. 30 TAC §285.7(d)(1)(A) requires every maintenance contract to “list items that are covered by the contract,” and pumping is a common line to either include or bill separately. Because §285.39(b) makes pumping the owner’s duty, a contract that leaves it out still leaves the owner responsible; the provider’s job is to report the sludge level so the owner knows when. What a Texas maintenance contract must contain lists the other five required provisions.

Two practical points follow from the rule:

• Use a registered transporter. The rule says “only persons registered with the executive director.” If you arrange pumping for an owner, confirm the hauler’s TCEQ registration.
• Write it on the report. If a tank was pumped between visits, note the date on the next report, so the sludge readings that follow make sense.

Does a self-maintaining owner still have to pump?

Yes. §285.39(b) applies to every owner of an OSSF. A single-family owner who takes over maintenance after the initial two-year policy (30 TAC §285.7(d)(4)) is exempt from testing and reporting under §285.7(e)(4), but not from pumping. See can homeowners maintain their own aerobic system.

Sources

• 30 TAC §285.39, On-Site Sewage Facilities Maintenance and Management Practices: https://www.law.cornell.edu/regulations/texas/30-Tex-Admin-Code-SS-285-39
• TCEQ, On-Site Sewage Facility Rules Compilation (RG-472): https://www.tceq.texas.gov/downloads/publications/rg/on-site-sewage-facility-rules-compilation-rg-472.pdf
• TCEQ, Maintenance of On-Site Sewage Facilities: https://www.tceq.texas.gov/permitting/ossf/ossfmaintenance.html

Last verified: 2026-10-14. Summarizes public rules as of Oct 14, 2026; not legal advice; verify with your permitting authority.

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