Pembrokeshire householders and businesses are being urged to use registered waste carriers and licensed waste disposal sites to reduce illegal waste tipping.
The Environment Agency Wales has become increasingly concerned about the volume of material being dumped illegally in the county.
The waste includes scrap vehicles, green garden waste, wood, soil, glass, furniture, domestic appliances such as fridges, freezers and cookers, builders rubble, metal and plastic waste.
Cleaning up costs a considerable amount of time and money and the agency is working with landowners, Pembrokeshire County Council, Pembrokeshire Coast National Park and other partners to deter offenders and advise where waste can be taken for legal disposal.
An agency spokesperson said: "There is no need for fly-tipping to occur in the area as the local council provides services for the collection of domestic refuse and the uplift of bulky items.
"Householders can have large items of household waste taken away free of charge by contacting (01437) 764555.
"Alternatively, they can take waste to civic amenity sites including those provided locally at the Waterloo Industrial Estate, Pembroke Dock; Winsel near Merlins Bridge, Haverfordwest; the Salterns, Tenby; St David's; Cnwc Sandy, Manorowen, near Fishguard and Hermon.
"Fly-tipping of waste is unacceptable, anti-social behaviour and a criminal offence, which we view seriously because it causes a threat to the environment and public health.
"We want to encourage people and businesses to use the proper waste disposal routes and would prefer to solve the problem by persuasion and co-operation, not prosecution.
"However, we are targeting known fly-tipping 'hot spots' for surveillance purposes and have already apprehended a number of people illegally depositing waste.
"Evidence has been gathered with a view to enforcement action and where possible prosecuting those involved.
"Any person found guilty of illegally depositing waste could face imprisonment for a term not exceeding six months or a fine not exceeding £20,000, or both.
"Over the coming months the agency will also be targeting other known illegal dump sites in the area. Should we find anyone illegally dumping waste, which may include surplus soil, we will not hesitate to use our substantial powers to prosecute."
People who witness pollution, illegal tipping of waste, poaching, fish in distress or danger to the natural environment can report the incident to the agency's emergency hotline on 0800 807060. The hotline operates 24-hours a day, 365 days a year.
Commercial businesses can also arrange a contract to have their waste collected by contacting Pembrokeshire County Council on (01437) 764555.