In your first 30 days with an aerobic septic system, collect the records, find out who maintains it and when the next service is due, and learn which checks are safe for you. You don’t need to open tanks or adjust equipment.
An aerobic treatment unit, or ATU, is different from a conventional septic system; our side-by-side comparison of aerobic and conventional systems explains the main differences. It uses oxygen to support additional biological treatment and may include mechanical components such as an air pump, control panel, pumps, alarms, and a disinfection stage. The exact components and maintenance requirements depend on the system design, manufacturer, permit, and local regulations.
The U.S. Environmental Protection Agency identifies aerobic treatment units as a distinct type of onsite wastewater treatment system. See the EPA overview of septic system types.
Use this checklist as a starting point. Your system manual, permit, maintenance contract, manufacturer instructions, and local permitting authority always take priority.
Week 1: records and contract
The first week is mainly about collecting information. You do not need to open tanks, adjust equipment, or perform repairs.
Try to locate the following:
- The manufacturer name and model of the treatment unit.
- The model of the air pump or aerator.
- The control panel and alarm instructions.
- The property permit and the as-built drawing or site plan.
- The manufacturer’s manual and the air-pump manual, if available.
- The current maintenance contract, if one exists, and renewal notices.
- Every dated service report and pumping record.
- Invoices and receipts for parts.
- The name and contact details of the previous maintenance provider.
- Contact information for the permitting authority.
The manufacturer and model may be printed on the control panel, equipment label, tank lid, air-pump housing, or paperwork left by the previous owner.
If you cannot find the permit or as-built drawing, contact the previous owner, home inspector, seller’s agent, local health department, or permitting authority. The exact records available depend on your state and county.
Find your components
Use the permit or as-built drawing to locate the tanks, control panel, aerator and dispersal area, and photograph the panel and equipment labels you can reach safely. Our components guide shows what each part does. Don’t open lids to identify them.
Your maintenance contract
Many residential aerobic systems require scheduled service by a qualified or licensed provider. The required schedule depends on your state, local permitting authority, system design, and maintenance contract.
For example, Texas guidance explains that local permitting authorities may impose requirements stricter than general state rules. See TCEQ guidance on onsite sewage facility maintenance.
In Texas, for example, TCEQ says a maintenance contract must list the items it covers, how often routine maintenance and testing happen, and who is responsible for the disinfection unit (TCEQ). See our contract checklist.
The exact scope varies. Ask your provider what the contract includes and what is billed separately:
- How often will the system be inspected?
- Is the provider authorized for this type of system in my area?
- Are written service reports included?
- Are parts included, or is the contract for labor and inspection only?
- What is the emergency callout fee?
- Who files reports required by the permitting authority?
- Is pumping included or billed separately?
- What happens if the property changes ownership?
- What maintenance tasks can the homeowner legally perform?
Your first service visit
A routine visit may include checks of the treatment process, air pump, pumps and floats, control panel, alarms, filters, mechanical components, disinfection stage, dispersal system, sludge levels, and required testing or reporting.
Keep every service report. A report that only says “system serviced” is less useful than one identifying the components inspected, readings taken, parts replaced, and recommendations made.
Our service visit guide explains what should appear on the report. EPA says alternative systems with pumps or mechanical components should generally be inspected once a year, and that a service contract is important (EPA). Your permit or local rules may require more.
Between visits: what to watch and write down
Between visits, your job is to observe from a safe distance and write things down: whether an alarm light is on, a change in the aerator’s sound, wet spots or odors over the dispersal area, and big changes in water use. If the house has a water softener, mention it at your first service visit; our guide to water softener discharge explains why its regeneration flow matters for an aerobic system. Don’t open the panel or pump housing, and use only the disinfection product your manual specifies. Our maintenance schedule turns this into a monthly routine, and our maintenance guide explains why each check matters. Keep vehicles, sheds and deep-rooted plants off tanks and the dispersal area.
Do aerobic systems need pumping?
Yes, solids still build up, but there is no single interval for every system. TCEQ says that for aerobic units it depends on the depth of sludge and the manufacturer’s recommendations; ask your provider to record the reason for any pumping recommendation. See our schedule guide for more.
What Homeowners Should Not Do
Leave the following tasks to a qualified professional:
- Entering or climbing into a tank.
- Opening tanks unnecessarily.
- Performing electrical work.
- Rewiring the control panel or pumps.
- Adjusting timers, floats, treatment settings, or alarm thresholds.
- Diagnosing a recurring alarm.
- Using a replacement part without confirming compatibility.
- Changing disinfection products without checking the manual.
- Performing maintenance that violates your contract or local rules.
Septic tanks and wastewater systems can contain hazardous gases and biological contaminants. Electrical components can also create a shock or fire risk.
Your First 30-Day Action Plan
This is an organizational example, not permission to delay required service, an ownership-transfer obligation, or an active problem. Confirm urgent and legally required actions immediately.
Days 1–3
Photograph the control panel and air-pump labels. Locate the access lids, permit, site plan, manuals, and previous service records.
Days 4–10
Identify the local permitting authority. Ask which maintenance, inspection, reporting, and ownership-transfer requirements apply to the property.
Days 11–20
Contact the previous service provider. If no current contract exists, request two or three written quotes from qualified providers and compare what each visit includes.
Days 21–30
Confirm the maintenance schedule, create your records folder, store the provider’s emergency contact details, and add a regular observation reminder to your calendar.
Free printable homeowner resource
Aerobic Septic System Maintenance Record
Keep your system details, confirmed requirements, service visits, due dates, alarms, and outages in one organized record. The PDF is designed for printing and keeping with your permit, manuals, contracts, and provider reports.
Download the free maintenance record (PDF)
Format: 3 pages · US Letter · No email required
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Frequently Asked Questions
What happens if an aerobic septic system loses power?
The answer depends on the system and the length of the outage. Contact your maintenance provider before switching equipment off or changing settings. Follow the manufacturer’s instructions and record when the outage occurred.
What should I do if the alarm sounds after heavy rain?
Record the alarm message, weather conditions, time, and duration. Heavy rain can be relevant to some systems, but it does not automatically mean the alarm can be ignored. Contact your provider if the alarm remains active or returns.
How much does aerobic septic ownership cost?
Expenses may include scheduled maintenance, electricity, disinfection supplies, pumping, inspections, and occasional component replacement. Costs vary by location, system design, contract terms, and equipment age. Request a written estimate from a provider familiar with your system; our cost guide explains each budget line.
Can I maintain my own aerobic septic system?
That depends on your state, county, permit, system type, training requirements, and maintenance contract. Do not assume that a homeowner rule in another county applies to your property. Confirm the requirements with your local permitting authority.
Continue With the Detailed Guides
Final Checklist
- Identify the system manufacturer and model.
- Locate or request the property records.
- Photograph the control panel and air-pump labels.
- Confirm whether a maintenance contract is active.
- Identify the local permitting authority.
- Record the location of tanks and the dispersal area.
- Add the professional service schedule to your calendar.
- Create a folder for reports, invoices, manuals, and pumping records.
- Write down the provider’s emergency contact information.
A new owner’s role is usually to observe, document, schedule, and follow the system’s instructions. When you are unsure, use the manual, permit, contract, and qualified provider as your sources of truth.
Sources
- U.S. Environmental Protection Agency, How to Care for Your Septic System, for the four elements of maintenance, the inspection and pumping intervals, the factors affecting pumping need, and the drainfield rules on parking, planting and rainwater drainage.
- U.S. Environmental Protection Agency, Types of Septic Systems, for what an aerobic treatment unit is and why it differs from a conventional system.
- Texas A&M AgriLife Extension, B-6234, “Living with an Aerobic Treatment Unit and Spray Field”, for the hazards that define the boundary between owner checks and licensed work.
- Texas Commission on Environmental Quality, OSSF maintenance guidance, 30 TAC §285.90(3), for the contract and reporting obligations a new owner inherits with the property.
Important: This article provides general educational information. The requirements that apply to your property are determined by your system documentation, permit, maintenance contract, manufacturer instructions, and local authority. Do not enter tanks or perform electrical or treatment adjustments yourself.
Last reviewed: October 15, 2026.