Signs of rat activity include:
• Scratching noises in walls or under floors.
• Droppings - dark and tapered,  about 10-14mm long.
• Distinctive ammonia-like aroma.
• Damage to buildings, pipework and wiring systems.
• Ripped food packaging/teeth marks.
• Nests - built in warm, hidden places using shredded material.
• Burrows - in compost heaps/ under sheds, decking, etc.

Overview
Rats pose a significant health risk to humans and pets, carrying or transmitting serious diseases, such as Weil's disease, salmonella, E.coli and tuberculosis, as well as fleas, mites and ticks that can cause acute allergic reactions. They are also probable carriers of foot and mouth disease on farms, and their urine can pollute stagnant water. Contaminating more food than they consume, they can infest and ruin foodstuffs and cause serious structural damage to buildings, pipework and wiring systems with their constant gnawing. Any rat problem in the home, garden or workplace must be treated urgently. While amateur DIY products are a cost effective way to control rat problems in low risk areas around the home, an Enviroguard professional should always be called in for infested business premises, or where there are more established colonies/repeated infestations.