Haverfordwest Water Hardness & Quality Report (2026)

Haverfordwest receives its water from Dŵr Cymru Welsh Water, which draws from Llys-y-frân Reservoir located in the Preseli Hills. This raw water is then treated at the Llys-y-frân Water Treatment Works before being supplied to residents. The Canaston Bridge raw water pumping station also plays a role in the supply network, having recently undergone a significant investment to improve its reliability. Dŵr Cymru Welsh Water serves a vast area, providing drinking water to around 1.4 million households and businesses daily across Wales and parts of western England.

Geological analysis indicates the water originates from the Preseli Hills, an area characterized by granite formations. This igneous rock typically contains a low concentration of minerals that contribute to water hardness. Consequently, the water flowing from this region is exceptionally soft. The specific geological composition of the Preseli Hills means that the water picks up very few dissolved solids as it travels through the ground and into the reservoir, resulting in its notably soft character.

Residents may notice that this extremely soft water requires less soap and detergent to achieve lather, making household chores like laundry and dishwashing more efficient. However, very soft water can sometimes lead to a slightly more metallic or "flat" taste compared to harder water. Over time, it's less likely to cause significant scale buildup inside appliances like kettles, coffee makers, or water heaters, potentially extending their lifespan. If you prefer a slightly "harder" feel, small amounts of minerals can be added via specific filtration systems, though this is rarely necessary.