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A borehole quote is not yet a drinking-water budget

By the Rowanspring team · Updated 10 November 2026

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  1. No contractor can guarantee the underground result from a headline price
  2. Build the budget in stages
  3. Compare the same risk allocation
  4. Contact the authorities before work
  5. Sources
Two empty sample bottles and a blue cool bag on a tray by a cottage sink, with a rowan tree outside

No contractor can guarantee the underground result from a headline price

Geology, depth, yield and water quality are site-specific. A drilling price per metre may exclude investigation, mobilisation, casing, grout, development, pumping tests, water analysis, headworks, pump, trenching, storage, treatment, electrics and making good. Ask what happens if the borehole is dry, low-yielding or needs more treatment than expected.

Build the budget in stages

  1. Feasibility: records, hydrogeological advice, source and abstraction enquiries, access and utility checks.
  2. Drilling: mobilisation, method, diameter, casing, seals, spoil and a clearly stated depth allowance.
  3. Proving: development, yield or pumping test, recovery observations and laboratory sampling.
  4. Completion: sanitary headworks, pump, rising main, controls, pressure vessel, storage and weather protection.
  5. Treatment: designed from appropriate analysis, with sample points, bypass controls only where suitable, alarms and commissioning.
  6. Connection: trenches, pipes, power, building entry, backflow protection and reinstatement.
  7. Ownership: electricity, sampling, council charges where applicable, servicing, consumables, pump replacement and emergency water.

Compare the same risk allocation

One quote may include a fixed depth and another a provisional metre rate. One may include a pumping test but not the pump. Put assumptions and exclusions beside the price. Ask who owns the borehole records, samples and any geological data, and what completion documents you receive.

Contact the authorities before work

Abstraction and drilling requirements differ by nation and intended volume. GOV.UK says some groundwater investigation and larger abstraction in England need consent or a licence. BGS also explains drilling records and obligations. Contact the relevant regulator and local authority before instructing work; do not rely on a contractor's price as confirmation that permissions are settled.

Sources