Travellers have set up camp on a cricket pitch on Chipperfield Common.
Around caravans and vehicles were on the site and are believed to have turned up on Thursday, August 10 in the early evening.
Dacorum Borough Council tweeted: “We are aware and we are working with Herts Police to resolve the situation as soon as possible.”
People from around the area took to social media to express their frustration.
Sarah Saxby tweeted: “Pikeys have taken up residence on Chipperfield Common and don’t look like they are going anywhere in a hurry.”
Alf the Hammer tweeted: “Gpysies on chipperfield common, trashed the cricket pitch, they are a disgrace.”