Air and Water Quality

Mole Valley District Council (MVDC) is required to review and assess air quality in the district while water quality is monitored by the Drinking Water Inspectorate.


airAlert is a free service for residents warning of pollution levels capable of affecting health.

Within Mole Valley the pollution levels are generally quite low. However, occasionally pollution reaches levels that are capable of causing short term health problems for people with respiratory problems.

airAlert sends a free text, e-mail or voicemail to warn twenty-four hours in advance of elevated pollution events enabling users to manage their condition more effectively.

If you would like to sign up for the service see the East Surrey airAlert website.

Air quality monitoring

MVDC routinely monitors air quality passively using nitrogen dioxide tubes placed at various locations throughout Mole Valley. The latest Air Quality report is available (see 'Downloads'). The report details the results of air quality monitoring undertaken across Mole Valley and is prepared in accordance with the guidance issue by the Department for Environment, Food and Rural Affairs.

Diffusion Tubes

We have 17 diffusion tubes throughout Mole Valley. These measure levels of N02 and gives us a general indicator of air pollution in the district. 
The results show raw data they are provisional results that have not yet been annualised, bias adjusted or distance corrected. Please do not use this raw data for interpretation view the annual air quality report. All periods of exposure are 4-5 week periods in agreement with recommended periods of exposure in line with Defra’s calendar.

Monthly Diffusion Tube Results

Drinking water quality

The public water supply has to meet stringent water quality standards set by Government regulations. Drinking water in Mole Valley is supplied by Sutton and East Surrey Water plc, Thames Water Utilities or in a very few cases by a private supply (eg. a spring, well or borehole). Routine sampling of such private water supplies takes place to check that the water is safe to drink.

Report Air or Water Pollution ›