Parameter compliance
Micro-Biological Parameters
Micro-Biological (Treatment Works)
Indicator Parameters
Micro-Biological (Reservoirs)
Chemical Parameters
Pesticides
Compliance with standards
Sample analysis
Total number of samples
Number of failures
Failures associated with consumer distribution system
Median compliance risk index
Event classifications
Consumer complaints on acceptability contacts
per 1,000 population
Wales per 1,000
Industry average per 1,000
Enforcement
Recommendations
Legal instruments served
Companies in transformation
Drinking Water Inspectorate — England 2025