Groundwater Contamination Prevention

Groundwater is water held in soil and rock underground, supplying drinking water and feeding rivers and wetlands.
Construction activities including fuel spills, cement washout, and chemical leaks contaminate groundwater.
Once contaminated, groundwater can take decades or longer to recover naturally if it recovers at all.
The Environmental Permitting Regulations make it an offence to discharge pollutants to groundwater.
Source protection zones (SPZs) around boreholes and wells have stricter controls on construction activities.
Piling and deep excavation can create preferential pathways for contaminants to reach aquifers below.
Fuel storage without bunding, leaking plant, and uncontrolled dewatering discharge are common contamination causes.
The Environment Agency can require polluters to clean up contaminated groundwater at enormous cost.
Concrete washout, drilling fluids, and grouting chemicals must never be discharged to unprotected ground.
The Water Framework Directive and UK environmental law protect all groundwater from deterioration.

Drinking water supply	Groundwater supplies drinking water to millions of people. Contamination puts public health at serious risk.
Legal liability	Causing groundwater pollution is a criminal offence with unlimited fines, cleanup costs, and potential imprisonment.
Irreversible damage	Groundwater contamination persists for decades. Prevention is the only practical approach because cleanup is extremely difficult.

Do

Don't

Store fuel and chemicals in bunded areas with 110% containment capacity.
Use drip trays under plant and equipment to catch oil and hydraulic leaks.
Direct concrete washout to a designated containment area, never onto bare ground.
Check whether the site is within a source protection zone before starting work.
Manage dewatering discharge to prevent contaminated water reaching groundwater.
Seal piling and borehole annuli to prevent creating pathways to aquifers.
Report any fuel spill, chemical leak, or pollution incident to the site manager.
Use spill kits immediately to contain and clean up any accidental release.
Brief all operatives on groundwater protection measures specific to the site.
Obtain environmental permits for any discharge that could affect groundwater quality.

DON'T store fuel or chemicals on bare ground without secondary containment.
DON'T discharge concrete washout, grout, or drilling fluids onto unprotected ground.
DON'T ignore oil leaks from plant; repair them and clean up contaminated soil.
DON'T pour waste chemicals, solvents, or paints down drains or onto the ground.
DON'T pump contaminated dewatering water to ground without treatment and consent.
DON'T drill or pile without assessing the risk of creating groundwater pathways.
DON'T delay reporting pollution incidents; early action limits the contamination spread.
DON'T assume rainwater dilution makes small spills harmless to groundwater below.
DON'T refuel plant or vehicles over unprotected ground near watercourses or drains.
DON'T leave spill kits locked away where they cannot be accessed quickly.

See also: Fuel and Oil Spill Prevention | Spill Kit Use and Deployment

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