If you witness any fly-tipping contact North Herts Police on the non emergency number 101 or 01707 354000.
For removal of fly-tipping which has already occurred, call Veolia 0800 328 6023.
NHDC have a Fly-Tipping page giving advice on preventing fly-tipping and what to do if witnessing fly-tipping. You can also report fly-tipping to them using their form.
The Environment Agency has a statutory responsibility to investigate the larger scale fly-tipping incidences where the waste may pose a serious risk to the environment and where the activity is linked to organised crime. Contact the Environment Agency incident hotline on tel: 0800 80 70 60