Cooling Tower Monthly Legionella Compliance Log

Important: Legionella pneumophila poses a serious public health risk. AS 3666 requires monthly inspections, continuous water treatment, and 6-monthly cleaning of cooling water systems. Non-compliance may result in health department orders and significant penalties.

Facility and Equipment Details

Facility Name

Cooling Tower ID/Tag

Tower Manufacturer

Tower Type

Capacity (kW)

Number of Cells

Water Treatment Contractor

Treatment Contract No.

Last Legionella Test Date

Last Full Clean Date

Inspector Name

Date of Inspection

#	Inspection Item	Method
1. Water Quality Parameters
1	pH reading recorded (target range per treatment program)	MEASURE
2	Conductivity/TDS reading (uS/cm)	MEASURE
3	Free chlorine or biocide residual measured	MEASURE
4	Bacteria dip slide result (last reading)	REVIEW
5	Legionella test result (last quarterly sample)	REVIEW
6	Make-up water meter reading	MEASURE
2. Chemical Treatment System
7	Dosing pump operational	TEST
8	Chemical drum levels adequate	INSPECT
9	Biocide dosing schedule maintained	VERIFY
10	Corrosion inhibitor concentration within range	MEASURE
11	Anti-scalant dosing confirmed	VERIFY
3. Physical Inspection - Tower Structure
12	Drift eliminators intact and properly seated	INSPECT
13	Fill pack condition (no fouling, algae, or scale)	INSPECT
14	Water distribution nozzles clear	INSPECT
15	Cold water basin - sludge/debris accumulation	INSPECT
16	Overflow and bleed-off functioning	TEST
17	Air inlet screens clear and intact	INSPECT
4. Mechanical Components
18	Fan operation and vibration	TEST
19	Fan blade condition	INSPECT
20	Motor condition and bearing noise	INSPECT
21	Belt/direct-drive coupling condition	INSPECT
22	Vibration switch functional	TEST
5. Water Circulation
23	Distribution even across fill pack	INSPECT
24	No dead legs or stagnant zones identified	INSPECT
25	Recirculation pump operation normal	TEST
26	Bypass filtration system operational (if fitted)	TEST
6. Risk Controls
27	Access restricted to authorised personnel only	VERIFY
28	Warning signage displayed at tower	VERIFY
29	Maintenance log book up to date	REVIEW
30	Emergency contact numbers displayed	VERIFY
31	PPE available for maintenance (respiratory, eye protection)	CHECK

Inspection Item

Method

P / F / NA

Notes / Readings

1. Water Quality Parameters

pH reading recorded (target range per treatment program)

MEASURE

Conductivity/TDS reading (uS/cm)

MEASURE

Free chlorine or biocide residual measured

MEASURE

Bacteria dip slide result (last reading)

REVIEW

Legionella test result (last quarterly sample)

REVIEW

Make-up water meter reading

MEASURE

2. Chemical Treatment System

Dosing pump operational

TEST

Chemical drum levels adequate

INSPECT

Biocide dosing schedule maintained

VERIFY

Corrosion inhibitor concentration within range

MEASURE

Anti-scalant dosing confirmed

VERIFY

3. Physical Inspection - Tower Structure

Drift eliminators intact and properly seated

INSPECT

Fill pack condition (no fouling, algae, or scale)

INSPECT

Water distribution nozzles clear

INSPECT

Cold water basin - sludge/debris accumulation

INSPECT

Overflow and bleed-off functioning

TEST

Air inlet screens clear and intact

INSPECT

4. Mechanical Components

Fan operation and vibration

TEST

Fan blade condition

INSPECT

Motor condition and bearing noise

INSPECT

Belt/direct-drive coupling condition

INSPECT

Vibration switch functional

TEST

5. Water Circulation

Distribution even across fill pack

INSPECT

No dead legs or stagnant zones identified

INSPECT

Recirculation pump operation normal

TEST

Bypass filtration system operational (if fitted)

TEST

6. Risk Controls

Access restricted to authorised personnel only

VERIFY

Warning signage displayed at tower

VERIFY

Maintenance log book up to date

REVIEW

Emergency contact numbers displayed

VERIFY

PPE available for maintenance (respiratory, eye protection)

CHECK

Water Quality Monthly Log

Date	pH	Conductivity (uS/cm)	Biocide Residual	Dip Slide (CFU)	Temp In (C)	Temp Out (C)	Operator Initials

Water Treatment Technician

Name

Qualifications

Signature

Date

Facility Manager

Name

Organisation

Signature

Date