Product Overview

Summary: This SOP sets out a clear, practical framework for protecting groundwater during drilling activities, ensuring environmentally responsible operations that meet Australian regulatory expectations. It guides crews through planning, drilling, containment, and decommissioning steps to prevent contamination incidents, safeguard community water resources, and support WHS and environmental compliance.

Groundwater is a critical resource for communities, agriculture, and industry across Australia, and drilling activities can pose significant contamination risks if not tightly controlled. This Groundwater Protection during Drilling SOP provides a structured, end-to-end process for planning and conducting drilling works in a way that prevents pollutants, drilling fluids, and surface contaminants from entering aquifers or connected water systems. It integrates WHS, environmental, and quality requirements into a single, workable procedure that crews can follow on any site.

The document addresses the full lifecycle of drilling—from pre-start site assessment and hydrogeological review, through drilling fluid selection and circulation control, to well construction, sealing, and site rehabilitation. It sets out clear responsibilities, control measures, and monitoring requirements so that your organisation can demonstrate due diligence under WHS and environmental legislation, reduce the risk of regulatory non-compliance, and maintain social licence to operate. By standardising how groundwater protection is managed in the field, this SOP reduces variability between crews, supports competent decision-making, and provides a defensible record of how risks to groundwater were identified and controlled.

Key Benefits

• Ensure drilling activities are planned and executed to minimise the risk of groundwater contamination and cross-connection between aquifers.
• Demonstrate compliance with Australian WHS and environmental obligations, reducing exposure to regulatory action, fines, and project shutdowns.
• Standardise groundwater protection practices across drilling crews, improving consistency, quality of work, and contractor performance.
• Reduce the likelihood of costly remediation works, reputational damage, and community complaints arising from drilling-related water impacts.
• Support safer decision-making by clearly defining roles, control measures, monitoring requirements, and emergency response steps for contamination events.

Who is this for?

• Drilling Supervisors
• Drillers and Offsiders
• Environmental Advisors
• WHS Managers
• Project Managers
• Site Managers
• Hydrogeologists
• Environmental Compliance Officers
• Operations Managers (Mining, Construction, Energy)
• Civil and Geotechnical Engineers

Hazards Addressed

• Contamination of groundwater from drilling fluids, fuels, oils, and chemicals
• Cross-contamination between aquifers or water-bearing formations through improper casing or sealing
• Uncontrolled flow of groundwater or artesian conditions during drilling
• Exposure of workers to contaminated groundwater or drilling returns
• Environmental harm from incorrect storage, handling, or disposal of drilling muds and cuttings
• Soil and surface water contamination leading to secondary groundwater impacts
• Manual handling and slip hazards associated with wet, muddy drilling environments
• Confined space and engulfment risks around sumps, pits, and containment systems

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Abbreviations
• 3.0 References, Legislation and Standards
• 4.0 Roles and Responsibilities
• 5.0 Pre-Drilling Planning and Approvals
• 6.0 Site Assessment and Hydrogeological Considerations
• 7.0 Risk Assessment and Groundwater Protection Controls
• 8.0 Equipment, Materials and Required PPE
• 9.0 Drilling Fluid Selection, Mixing and Management
• 10.0 Containment of Drilling Muds, Cuttings and Wastewater
• 11.0 Bore Construction, Casing, Grouting and Sealing Requirements
• 12.0 Procedures for Managing Artesian or High-Pressure Groundwater
• 13.0 Spill Prevention, Response and Clean-Up
• 14.0 Groundwater Monitoring, Sampling and Record-Keeping
• 15.0 Decommissioning, Well Abandonment and Site Rehabilitation
• 16.0 Environmental and WHS Incident Reporting and Investigation
• 17.0 Training, Competency and Communication
• 18.0 Inspection, Audit and Continuous Improvement

Legislation & References

• Work Health and Safety Act 2011 (Cth) and equivalent state and territory WHS legislation
• Environment Protection and Biodiversity Conservation Act 1999 (Cth)
• Relevant state and territory Water Acts and groundwater protection regulations (e.g. NSW Water Management Act 2000, QLD Water Act 2000)
• AS/NZS 4801: Occupational health and safety management systems
• AS 4360 / ISO 31000: Risk management – Principles and guidelines
• AS/NZS 5667: Water quality – Sampling (for groundwater monitoring and verification)
• National Environment Protection (Assessment of Site Contamination) Measure (NEPM)
• Relevant state Codes of Practice or Guidelines for Drilling, Bore Construction and Groundwater Protection (e.g. Minimum Construction Requirements for Water Bores in Australia)