System brand and model number.

Council area.

Domestic or Commercial

Date of next service due.

What is the general condition of the tank area as you arrive?

What is the general condition of the irrigation area as you arrive?

Comments on surrounding area.

Tank area
Irrigation area

Crust present?

Odour present?

What is the sludge depth?

Are inlet / outlet junctions clear?

Does the system require a desludge to be performed?

Are sludge return lines clear?

Does there appear to be good biological activity in the system?

Aeration zone

Odour present?

Record the pH level.

Record the dissolved oxygen level, mg/L

Activated sludge

Is this an activated sludge system?

Is the air blower working?

Are the diffusers operating?

Is there sufficient air supply?

Is the air blower pressure ok?

Have the aeration timers / diffusers been adjusted?

Has the air filter been cleaned or replaced?

Is there a biofilm build up?

What is the colour of the effluent?

Is there suspended growth in the system?

If yes, perform a settleabillity test.

Settleabillity results.

Trickling filter

Does the system have a trickling filter?

Is the recirculation pump operational,

Is the rotating arm / sprayer operational?

Is the distribution plate biofilm good?

Is the timer working correctly?

Clarification zone

Is the sludge return operating?

Is the scum return operating?

What is the sludge depth?

What is the clarity?

Irrigation chamber

Is the irrigation pump operational?

Are the float switches operational?

Is there a presence of sludge

Are the alarms operational


What is the type of disinfection

Record the free Chlorine mg/L

Record the Turbidity NTU

Number of Chlorine tablets consumed?

Number of Chlorine tablets replaced?

If the system is fitted with UV

Have the lamps been cleaned

Have the lamps been replaced


Is there any evidence of physical damage?

Is there any ponding or runoff?

Is there excess weed growth in the area

Is the effluent running in to a dam, storm water drain, creek or river,

Surface spray irrigation

Are sprinkler heads working

Are sprinklers spraying in a high risk area?

Is the filter clean?

Subsurface irrigation

Operating pressure

Is the filter clean?

Perform back flushing of lines

Mound / Trench / Bed.

Is there any ponding to leaching occurring?



General condition

Have alarms been tested?

Is the high water alarm operational?

Is the low air alarm operational?

Is the electrical compartment in good condition,


Comments or Repairs required

Service technician
Please note that this checklist is a hypothetical example and provides basic information only. It is not intended to take the place of, among other things, workplace, health and safety advice; medical advice, diagnosis, or treatment; or other applicable laws. You should also seek your own professional advice to determine if the use of such checklist is permissible in your workplace or jurisdiction.