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Aerobic treatment unit (ATU) service in Hays County / the Central Texas Hill Country

An ATU is a small mechanical treatment plant: an air pump feeds oxygen into a treatment chamber so aerobic bacteria break waste down far more completely than a conventional tank. Cleaner effluent, smaller footprint, higher nitrogen removal — and moving parts that need attention.

CONVENTIONAL ATU — AEROBIC TREATMENT UNIT full-size drain field ~30% nitrogen removed air pump smaller field 65%+ nitrogen removed
An aerobic unit treats to a higher standard, which is why it can disperse where soil is thin.

Services

  • Scheduled maintenance visits (typically twice yearly) and the required service records
  • Air pump / blower diagnosis and replacement — pumps last 5–10 years, $200–$450 per year for a maintenance contract, varying with visit frequency and travel is the typical operating cost including the permit
  • Alarm response: a blinking or sounding alarm usually means the air pump has stopped; the system reverts to anaerobic treatment within days if it isn't fixed
  • Effluent quality checks and float/dosing adjustments
  • Pumping — an ATU still accumulates solids

Common brands serviced: Clearstream, Jet, Norweco, Hoot, Fuji Clean and other units approved for Texas. Installation and warranty work require manufacturer certification beyond the standard contractor license — ask which brands your contractor is certified on.

All work is performed by TCEQ-licensed installers and licensed maintenance providers working under the county's on-site sewage facility program.

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Starting or moving a maintenance contract, or pricing a replacement. Use the details box for the system brand, whether it is currently under contract, or a closing date if you are buying or selling.

All work is performed by TCEQ-licensed installers and licensed maintenance providers working under the county's on-site sewage facility program.