> For the complete documentation index, see [llms.txt](https://guidelines.nhmrc.gov.au/australian-drinking-water-guidelines/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guidelines.nhmrc.gov.au/australian-drinking-water-guidelines/part-3/chapter-9/9.4-operational-monitoring/9.4.4-corrective-action.md).

# 9.4.4 Corrective action

Where monitoring results indicate a deviation from target criteria or critical limits, appropriate corrective actions and process adjustments should be instituted to maintain water quality. Examples of corrective actions are:

* repairing fences;
* removing dead animals from catchment areas;
* increasing catchment controls;
* inspecting the water supply system for faults;
* altering the flow rate of the water treatment plant to reduce loading;
* manual backwashing of filters;
* adjusting process control;
* inspecting and calibrating monitoring equipment;
* engaging back-up equipment;
* adjusting pH;
* selecting an alternative raw water source, if available;
* increasing disinfection dose;
* booster disinfection;
* flushing of mains; or
* increasing monitoring and observation.

Additional monitoring will be required throughout the system to verify the effectiveness of any corrective actions.