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Monitoring & Sampling

What you need

Watertec encourages and supports its clients to undertake routine monitoring tasks themselves.

However there are circumstances where it is appropriate that monitoring tasks are included in our service provision.

Monitoring tasks undertaken by Watertec regularly include:

  • Temperature checks
  • Tank inspection and profiling
  • Calorifier blowdown and inspection 
  • Water heater temperature adjustment
  • Scald protection device checking and maintenance
  • Shower head disinfection
  • Outlet de-scaling and mildew treatment
  • Microbiological sampling
  • Checking monitoring records
  • Low use outlet flushing

Where required, Watertec provides monitoring services to monthly task level.

What we do

ATP Sampling

ATP is an excellent indicator of microbial activity in built environments and widely used by Waterec as an integral part of our risk assessment and monitoring activities.

In brief:

  • ATP is the acronym for the compound adenosine tri-phosphate
  • ATP is the primary energy-transferring molecule in all living cells.
  • Metabolic processes that produce energy in a cell use ATP to transfer the energy to other cell reactions which require energy.
  • While alive, cells produce ATP continuously.
  • When processes for ATP production are inhibited, all available ATP is consumed.
  • Without ATP, bacteria become dormant, and, unable to maintain cell integrity, eventually die.
  • When cells are killed, their ATP rapidly decreases.
  • Thus, ATP can be used to monitor levels of metabolically active organisms in a liquid or deposit sample.
  • Detects all bacteria - aerobic and anaerobic. No bias from growth medium composition or conditions.
  • Fast. Results are generated on-site in less than one minute.
  • Portable. Small hand-held detector, all-in-one sampling device with built-in reagents.
  • Excellent for bulk water and surface deposit samples.

LLP Sampling

It is recommended that monitoring for legionella is carried out:

  • when there is evidence that the system has become contaminated
  • is a system is suspected of causing a case of legionellosis
  • when control levels for the system (i.e. temperature, biocide, regular usage) are not being consistently achieved
  • in instances where the control regime for a hot water system involves maintaining a lower temperature, to save energy, in conjunction  with  use of a biocide. 

Testing of samples for legionella can only be performed in laboratories accredited to BS EN ISO/IEC 17025:2005 with current ISO standard methods for the detection and enumeration of legionellae included within their scope of accreditation. 

These methods can be for detection and enumeration of legionella by culture for viable cells or by a validated and accredited qPCR method. 

Watertec’s analytical services provider holds the appropriate UKAS accreditation. 

TVC Sampling

Total Viable Count (TVC) analyses are very useful for trend analysis whereby changes in the numbers of microbes present in a system can be monitored over time and multiple samples. This can reveal useful information regarding factors having an effect on TVC counts, e.g. If a count is substantially higher during summer months it is likely that the organisms in the system are flourishing in higher temperatures and a suitable control measure may include reducing the temperature of the system in the summer. 

A TVC test is only an estimate and results should be considered as an order of magnitude, e.g. less than 10, less than 100, less than 1000. A count of 50 cfu/ml obtained one month followed by a count of 60 cfu/ml would not be considered as significant based on the limitations of the procedure however a count of 50 one month followed by a count of 5000 the following month is clearly indicating a dramatic change to the system.

Drinking Water Inspectorate Recommendations

Our analytical service provider has provided us with the following guidelines for TVC samples issued by the Drinking Water Inspectorate (DWI).

Drinking Water Standard
  • Method: 2 days @ 37°C maximum 50 cfu/ml
  • Method: 3 days @ 22°C maximum 500 cfu/ml
Washroom Water Standard
  • Method: 2 days @ 37°C maximum 500 cfu/ml
  • Method: 3 days @ 22°C maximum 5000 cfu/ml

Water Tanks

Cold water storage tanks require special attention.

The temperature of the incoming mains and at the outlet should be checked every 6 months and a full inspection should be undertaken annually.

Watertec’s annual inspection includes:

  • Temperature checks and evaluation of stored water capacity including re-profiling if required
  • Inspection of:
    • Tank integrity, pipework and fittings
    • insect screens and vents
    • insulation
    • backflow protection
    • water quality
    • accumulation of scale, silt or the presence of biofilm

Photographic records are taken and included in a comprehensive engineer report.

Water Heaters

Thermostatic mixing valves require regular maintenance and inspection to ensure they remain fit for purpose.

Six monthly outlet temperature checks are recommended and are a simple task that most of our clients undertake themselves.

Watertec offers an annual service including:

  • supply and outlet temperature checks and adjustment
  • a fail safe check
  • a swap out service for units found to have developed faults

Scald Protection

Thermostatic mixing valves require regular maintenance and inspection to ensure they remain fit for purpose.

Six monthly outlet temperature checks are recommended and are a simple task that most of our clients undertake themselves.

Watertec offers an annual service including:

  • supply and outlet temperature checks and adjustment
  • a fail safe check
  • a swap out service for units found to have developed faults

Benefits

TO ORDER OR FOR MORE INFORMATION
Contact us on
01509 853716 or enquiries@watertecltd.com

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