Share of sludge made at the four works that have an advanced digester on site

37.3%2024-25sourcedmedium confidence

This is why 98% of the company's sludge can be digested although it has hundreds of works: the 98% is company-wide, not per site. Our sum from the company's published return, not a figure the company states.

Welsh Water, Bioresources market information 2024-25sheets WwTW, Small WwTW and STC: sludge made at the works co-located with Afan, Cardiff Bay, Cog Moors and Five Fords, as a share of all sludge listed

2,432.165 + 13,966.739 + 7,151.686 + 4,613.634 = 28,164.224 tDS, of 73,932.593 tDS from the 137 larger works plus 1,493.447 tDS from the 450 small works (75,426.039 tDS). The rest, about 63%, is made at other works and carried to a digester, or to a thickening or dewatering centre first, by tanker or pipeline.