LERAP Buffer-Zone Calculator
Work out the minimum legal aquatic buffer zone for a horizontal boom sprayer under the UK LERAP scheme, and keep a dated record. A decision-support aid — always confirm against the product label and current CRD guidance.
Records saved here stay only on this device. Create a free account (or log in) to save and back them up across your devices — or print/save the PDF. LERAP records must be kept for three years.
Two rules that come with a reduced buffer
- 48 hours. If you reduced the buffer by using a reduced dose rate, you cannot repeat an application of that product on the same area within 48 hours.
- The nearest 12 metres. If you used LERAP Low Drift equipment to reduce the buffer, that same equipment must be used to spray the 12 m nearest the watercourse, measured from the top of the bank.
Both are in the HSE scheme booklet for horizontal boom sprayers, alongside the requirement to record every LERAP — including a decision to keep the full label buffer — and keep it for three years.
Decision-support aid to the official LERAP scheme for horizontal boom sprayers. It does not advise whether or what to spray. You remain responsible for compliance: confirm the LERAP category and buffer on the product label, follow current CRD guidance, and keep LERAP records for three years.
Keep learning
New to data-driven farming? Read our complete guide to precision agriculture in the UK, see what precision farming actually costs, or take the free interactive introduction course — story-driven, narrated, and cited to AHDB and gov.uk.
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