Technology House, Stratfield Park, Waterlooville, PO7 7XN 023 9223 3611
Speak to an expert
Cooling Tower Legionella Monitoring

Notifiable plant.
Watched live.
Day and night.

Evaporative cooling systems are notifiable plant under HSG274 Part 1. AQUAIOT adds continuous temperature and level visibility with alerts and telemetry, so cooling tower water systems are watched between service rounds.

Speak to an Expert See how it works
Live monitoring. Continuous compliance.
AQUAIOT L8 Dashboard
42Outlets OK
3Caution
1Alert
Sentinel Outlets – Live
Tank A – Cold Feed18.4°COK
Outlet 7 – HWS Return49.1°CCaution
Outlet 12 – Sentinel56.8°CAlert
CW Tank B17.2°COK
Man-in-a-van visits leave gapsInspection sheets capture one moment. Between rounds, temperatures drift unseen, and your compliance record has no answer for it.
Legionella thrives between 20C and 45CRisk conditions develop and resolve between visits. Manual schedules cannot catch what happens overnight.
Audit prep should not take daysWhen an inspector asks for records, paper logbooks take days to compile. A digital audit trail is instant.
Every missed flush is a duty-of-care gapOne undocumented flushing event is a defensible record waiting to fail under legal scrutiny.
The AQUAIOT Solution

Continuous visibility.
On notifiable plant.
Between services.

Cooling towers carry significant Legionella risk and strict obligations. AQUAIOT provides continuous monitoring, alerting, and telemetry around the water system, complementing your treatment regime rather than replacing it.

Continuous temperature and level, live readings around the cooling tower water system, profiled around the clock between scheduled service visits.
Immediate threshold alerts, SMS, email, and app notification when monitored conditions move outside the range you have set.
Telemetry and integration, secure cellular and LoRaWAN data feeding role-based dashboards and your BMS, SCADA, or CAFM over RS485/Modbus or REST API.
Request a Consultation
Live Outlet Status
CW Tank – Return Temp16.8°C
HWS Flow – Calorifier60.4°C
HWS Return – Loop 349.3°C
Sentinel Outlet 1256.8°C
Alert triggered – Outlet 12
Temperature above L8 calorifier threshold. Notification sent 14:32.
How It Works

Three steps to continuous L8 compliance

Step 01

Monitor

AQUAIOT sensors are deployed at tanks, loops, calorifiers, and sentinel outlets. Temperature is profiled continuously, every reading timestamped and logged to the cloud over secure cellular or LoRaWAN telemetry.

Step 02

Alert

When temperatures drift outside HSE L8 thresholds, or when a scheduled flush is missed, AQUAIOT triggers an immediate alert via SMS, email, or app, with role-based escalation rules for your estates team.

Step 03

Record

Every reading, alert, and action is captured in tamper-evident audit logs. Records are exportable on demand and integrate with CAFM, BMS, and AIMS systems, so audit preparation is minutes, not days.

Capabilities

Everything your L8 programme needs

Purpose-built for estates, facilities, and compliance teams managing water systems across single or multiple sites.

Real-time temperature profiling

Continuous monitoring at tanks, calorifiers, loops, and sentinel outlets. Every reading timestamped and stored, never a gap in your record.

HSE L8 threshold alerting

Thresholds checked against HSE L8 and ACoP guidance. Alerts fired immediately when cold water exceeds 20C or hot water falls below 50C at point of use.

Missed-flush detection

AQUAIOT detects when scheduled flushing routines are not completed and generates an automatic alert, so no event is undocumented.

Tamper-evident audit trails

Every reading and action is logged with a secure, unalterable timestamp. Exportable records ready for audit, inspection, or HSE enquiry at any time.

API / BMS / CAFM integration

Open and interoperable. AQUAIOT connects to your existing SCADA, AIMS, CAFM, and BMS platforms via RS485/Modbus or REST API, no lock-in.

Retrofit-friendly deployment

Non-invasive sensors designed for live environments. No pipe cutting, no shutdown. AQUAIOT engineers handle site survey, installation, and commissioning.

Compliance & Standards

Aligned to the standards your auditors check.

HSG274 Part 1 Notifiable Plant Continuous Visibility Telemetry & Alerts
Book a Demo

No commitment. Talk to our engineering team.

Who It’s For

Built for the teams responsible

Housing Providers

Protect tenants. Prove compliance.

Housing associations and registered providers carry a statutory duty of care over water systems in their properties. Manual L8 management across multiple sites is operationally fragile, and increasingly under scrutiny.

  • Continuous monitoring across all properties, single dashboard view
  • Automatic alerts when vacant properties develop risk conditions
  • Audit-ready records for insurance, regulatory, and legal purposes
  • CAFM and property management system integration
NHS & Public Sector

Clinical-grade water safety. Without the admin burden.

NHS Estates and public sector facilities operate under HTM 04-01 and HSE L8 obligations. The complexity of large estates, multiple buildings, and dense pipework makes manual monitoring inadequate at scale.

  • Dense outlet coverage across clinical environments
  • Real-time temperature monitoring at thermostatic mixing valves and outlets
  • Integration with existing BMS and CAFM infrastructure
  • Automated compliance records compatible with HTM 04-01 requirements
Facilities & Estates

Less time on rounds. More time on management.

Commercial estates, universities, leisure facilities, and large offices face the same challenge: manual L8 inspection rounds are resource-intensive and provide only a snapshot. Automation changes that calculus entirely.

  • Replace labour-intensive manual rounds with automated monitoring
  • Role-based dashboard access for estates managers, deputies, and contractors
  • Reduce reactive call-outs, detect issues before they escalate
  • On-demand compliance reports for building managers and insurers
Defence & Secure Sites

Secure by design. Compliant by default.

Defence estates, MoD sites, and government facilities carry the same L8 duty of care as any other property, often across aging, complex pipework that is hard to reach and harder to document. Manual rounds leave gaps AQUAIOT closes permanently.

  • Encrypted telemetry, cellular and LoRaWAN with secure payload transmission
  • Tamper-evident immutable logs with timestamps and user actions
  • Role-based dashboard access, right records to the right people
  • Auditable compliance records meeting MoD and government estate requirements
Open, interoperable systems. No lock-in. Engineered for operational environments.
Cellular + LoRaWAN telemetry Encrypted payloads & OTA updates RS485/Modbus + REST API Role-based cloud dashboards CAFM / BMS compatible
Questions & Answers

Cooling tower Legionella monitoring, answered

How does AQUAIOT support cooling tower Legionella management?
AQUAIOT adds continuous temperature and level visibility, threshold alerting, and secure telemetry around the cooling tower water system. Evaporative cooling systems are notifiable plant under HSG274 Part 1 and carry significant risk, so continuous monitoring between service visits strengthens oversight. It complements your treatment and testing regime rather than replacing it.
Does AQUAIOT carry out biocide dosing or microbiological testing?
No. AQUAIOT provides monitoring, not chemical treatment or laboratory analysis. We deliver continuous temperature and level visibility, alerting, telemetry, and integration around the water system. Biocide dosing, water treatment, and microbiological sampling remain with your specialist water treatment provider and competent person.
Why is continuous monitoring useful on notifiable cooling plant?
Cooling towers are serviced periodically, but conditions in the water system change continuously. Continuous temperature and level monitoring with immediate alerts means a drift outside the configured range is flagged as it happens, between visits, giving your team and treatment specialist earlier warning than a scheduled check alone.
Can cooling tower data feed our BMS or SCADA?
Yes. AQUAIOT is open and interoperable, connecting to BMS, SCADA, AIMS, and CAFM platforms over RS485/Modbus or REST API. Cooling tower monitoring data can flow into the systems your engineering team already uses, with role-based dashboards and exportable records, and no vendor lock-in.
Is the monitoring suitable for an existing cooling tower installation?
Yes. AQUAIOT sensors are designed for retrofit in live environments, and our engineers carry out the site survey, installation, and commissioning. An existing cooling tower water system can be instrumented for continuous monitoring without disruptive rework.
Explore the AQUAIOT range

Related AQUAIOT monitoring solutions

Automated Legionella Monitoring Digital Water Safety Monitoring Legionella Risk Monitoring Legionella Monitoring System IoT Legionella Monitoring Legionella Monitoring for Manufacturing
Ready when you are

Add continuous oversight to your cooling plant.

Talk to our engineering team about continuous monitoring, alerting, and telemetry for your cooling tower water systems.

Speak to an Expert Book a Demo 02392 233 611
Cooling Tower Monitoring – Speak to an AQUAIOT engineer about your estate.
Speak to an Expert
Shopping Cart (0 items)