Pumping and Overpumping

Toolbox Talk Record

Ref: TBT-WAT-025  |  Issue: 1  |  Date: April 2026
PresenterProject
LocationDate

What?

Why?

Prevent pollutionA pump failure during overpumping can release thousands of litres of raw sewage into the environment within minutes.
Regulatory prosecutionThe Environment Agency prosecutes sewage pollution incidents with unlimited fines — contractors share liability.
Client relationshipCausing a pollution incident on a client's operational site damages the working relationship and future opportunities.
DoDon't
  • Check all pump connections, hoses, and couplings before starting any pumping operation.
  • Ensure standby pumps are primed, tested, and ready for immediate changeover if needed.
  • Monitor pump performance continuously and record flow rates and pressures at set intervals.
  • Follow the written overpumping procedure and escalation plan for the specific site.
  • Obtain discharge consent before pumping any water into a watercourse or public sewer.
  • Use sediment settlement and filtration before discharging site water to any receiving body.
  • Secure all hoses and connections to prevent burst joints under pressure during operation.
  • Brief all operatives on the emergency response procedure for pump failure scenarios.
  • Maintain fuel supplies for diesel pumps to prevent generators running dry mid-operation.
  • Report any unusual pump noises, vibration, or drop in performance immediately.
  • DON'T leave pumping operations unattended without continuous monitoring in place.
  • DON'T discharge pumped water directly into watercourses without consent and treatment.
  • DON'T use hoses or fittings that are not rated for the system operating pressure.
  • DON'T allow sewage overpumping to operate without a tested standby pump available.
  • DON'T ignore a pump alarm or warning light — investigate and respond immediately.
  • DON'T walk over or drive vehicles across pumping hoses laid on the ground surface.
  • DON'T attempt to repair hose connections or couplings while the system is pressurised.
  • DON'T pump contaminated groundwater without testing and appropriate disposal arrangements.
  • DON'T assume overpumping is low risk — a failure has immediate regulatory consequences.
  • DON'T delay reporting a pump failure to the client — every minute increases pollution risk.

See also: Silt and Sediment Control | Pollution Incident Reporting