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Sydney & New South Wales

Percolation Testing Sydney & Wollongong

Percolation and infiltration testing measures how quickly water enters site soils. Sydney Geotechnical provides field testing and clear ground information to support stormwater infiltration, on-site wastewater and absorption-system design across Sydney, Wollongong and nearby NSW regions.

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Indicative feeScope-basedPrimary referenceProject, council and stormwater-design requirementsCoverageGreater Sydney & NSW

When this service is useful

The right scope depends on your development, site access, ground conditions and the information needed by your project team. This service is commonly used for:

  • Stormwater infiltration and absorption systems
  • On-site wastewater and effluent disposal assessments
  • Granny flats, new dwellings and development applications
  • Sites where a hydraulic engineer, wastewater consultant or council requests field infiltration data

What the assessment can include

  • Review of the proposed system, site plan and authority requirements
  • Selection and preparation of representative test locations
  • Field testing at agreed depths using an appropriate test method
  • Logging of soil profile, groundwater or refusal conditions encountered
  • Interpretation of measured infiltration behaviour and site limitations

What you receive

  • Test locations, depths and field methodology
  • Recorded observations and calculated test results
  • Relevant soil and groundwater observations
  • Clear limitations for use by the system designer or approval team

Frequently asked

Percolation & Infiltration Testing questions

Is a percolation test the same as a geotechnical investigation?+

No. Percolation testing focuses on water infiltration at selected locations and depths. A broader geotechnical investigation may be needed when foundation, excavation or slope questions also need to be addressed.

Who designs the stormwater or wastewater system?+

The relevant hydraulic, civil or wastewater designer uses the field results with their design criteria. Our report documents the ground testing and geotechnical observations within the agreed scope.

Can testing be completed where shallow rock or groundwater is present?+

Testing may still provide useful information, but shallow refusal, perched water or groundwater can limit the available absorption depth. We record these conditions and explain the resulting limitations.

Related geotechnical services

Geotechnical investigationsView service →Site classificationView service →