Henlow Water Hardness & Quality Report (2026)

Affinity Water supplies Henlow, a village in Central Bedfordshire in the Ivel Valley near Biggleswade — home of RAF Henlow (now a Defence Medical Rehabilitation Centre) and set in the gentle River Ivel chalk valley farmland of Bedfordshire — from the Bedfordshire Chalk aquifer boreholes in the mid-Bedfordshire chalk zone, treated at Ivel Valley Water Treatment Works near Shefford. At 185.5 mg/L (13.0°Clark), Henlow's water is hard — consistent with the Cretaceous Chalk aquifer of the Bedfordshire and Chiltern chalk belt that delivers moderately hard calcium bicarbonate groundwater to the Affinity Water mid-Bedfordshire supply zone.

Henlow sits in the Ivel Valley where the Cretaceous Chalk underlies the chalk lowland farmland of mid-Bedfordshire. Affinity Water draws on chalk boreholes in the Ivel Valley supply zone, extracting moderately mineralised chalk groundwater to deliver 185.5 mg/L with TDS 426.9 mg/L — hard, consistent with the mid-Bedfordshire chalk belt chalk aquifer supply that serves the Ivel Valley corridor from Shefford through Biggleswade to Sandy, all within the Affinity Water Bedfordshire chalk distribution zone.

At 185.5 mg/L, limescale is a persistent household concern in Henlow. Kettles benefit from descaling every three to four weeks. The combi-boiler should be fitted with a scale inhibitor and serviced annually. Washing-up liquid requires more product per wash. Taps and shower heads develop visible white limescale deposits within one to two weeks; a fortnightly wipe with white vinegar or a proprietary descaling product keeps fittings clean and prevents chalk staining from building up permanently in this hard mid-Bedfordshire Ivel Valley chalk supply zone.