Share of sludge treated by advanced anaerobic digestion

98.2%2025-26sourcedhigh confidence

The company's reported result for the year, not a target. A company-wide share of all sludge, by weight; the target in its price review was 97.3% (the 2024-25 result was 98.3% on that measure, and it says 'a small volume' was not processed through the four plants because of maintenance). A further 0.2% went through advanced digestion run by a third party. Most sludge is made elsewhere and carried to the four plants; our check of its routing data is below.

Welsh Water, Annual Performance Report 2025-26 (tables)Table 8D, line 8D.4, 'by incumbent'