Water Testing: When Should You Test and What Should You Look For?
Water quality can change over time, even when it looks clear. Land use, weather, infrastructure, industrial activity, and treatment systems can all affect what is present.
Professional water testing and sampling help businesses, property owners, councils, and environmental teams identify potential issues and determine whether action is needed.
Verum Group provides water testing services across New Zealand, the Pacific and Asia, supporting drinking water, environmental monitoring, discharge compliance, and ongoing water management.
When Should Water Be Tested?
The right testing frequency depends on how the water is being used, the potential risks involved, and any consent or regulatory requirements.
Testing may be appropriate when:
A bore, tank, or other water supply is being used for drinking.
A site is discharging water into the environment.
Construction, industrial, or agricultural activities may be affecting nearby waterways.
There has been a spill, contamination event, or unusual change in water quality.
Treatment systems need to be checked for effectiveness.
Resource consent conditions require ongoing monitoring.
A business needs baseline data before a project or operational change begins.
Regular monitoring can also help identify trends that may not be obvious from a single sample.
What Can Water Be Tested For?
The parameters selected depend on the water source and the reason for testing.
Verum Group can test for a wide range of water quality indicators, including:
pH.
E. coli and faecal coliforms.
Turbidity.
Free available chlorine.
Metals.
Nitrates and phosphates.
Hydrocarbons.
Pesticides.
Volatile organic compounds (VOCs).
Other microbiological, chemical, and physical contaminants.
Selecting the right parameters is important because drinking water, groundwater, stormwater, wastewater, and surface water can all require different testing approaches.
Environmental and Discharge Water Testing
Water monitoring also plays an important role in environmental management.
Surface water, groundwater, stormwater, and industrial discharges may be tested to understand the impact of site activities and help demonstrate compliance with environmental requirements.
Depending on the site, analysis may include nutrients, metals, hydrocarbons, pH, bacteria, pesticides, or other contaminants.
Why Good Sampling Matters
Accurate laboratory analysis starts with a representative sample.
Verum Group’s water sampling process involves using appropriate sampling containers and preservation methods, recording relevant site conditions, and transporting samples for laboratory analysis.
This helps ensure the results accurately reflect the water conditions at the time of sampling and provides reliable information for decision-making.
Turning Water Testing Results Into Action
Testing provides more than laboratory numbers. Results can help organisations:
Identify potential contamination.
Check whether treatment or controls are working.
Support consent and compliance requirements.
Investigate environmental incidents.
Plan ongoing monitoring.
Make informed water management decisions.
Verum Group can also advise on what to test, how often monitoring should occur, and how results can support compliance.
Professional Water Testing and Sampling
Water quality can vary significantly depending on the source, surrounding environment, and how the water is being used.
Verum Group provides professional water testing and sampling services across New Zealand, the Pacific and Asia, covering drinking water, discharge compliance, environmental waters, and ongoing monitoring programmes.
If you need to understand the quality of your water or establish an appropriate monitoring programme, contact Verum Group to discuss the testing approach best suited to your site.