Officials at a First Nations reserve near Brantford, Ont., have declared a state of emergency amid fears that the chemical runoff from a dump fire could have long-lasting health and environmental consequences.

The state of emergency comes days after a chemical fire broke out near the household hazardous waste area of a dump at the Six Nations of the Grand River reserve on Wednesday afternoon.

The initial fire produced heavy smoke, several explosions and flaming streams of chemical runoff, the Six Nations Council said in a statement on Friday. Fire crews extinguished the flames but remained on the scene in case they re-ignited.

"The chemical runoff has been contained for the moment, however the site still poses serious health and safety risks to those in the immediate vicinity," the council said.

The dump has been closed off and the problem area quarantined since Wednesday. A hazardous materials team has been called in to investigate, the council said.

Six Nations fire chief Matthew Miller says the fire is out but it could re-ignite, which would pose a challenge for his crew. "We're not equipped to deal with hazardous material response," Miller told CTV Kitchener on Saturday.

Six Nations of the Grand River chief Ava Hill declared the state of emergency on Friday. Federal and provincial authorities have been notified and are "corresponding" with the reserve to deal with the "unknown chemical mixture," the council said.

Hill said she's open to any financial assistance the federal or provincial governments can offer. "It's not going to be cheap for us to get it cleaned up," she said.

The federal government is spearheading the response and working with the province to resolve the matter, a spokesperson for the Ontario Ministry of the Environment and Climate Change told CTV News in a statement.

The fire broke out in an area of the dump where waste paint cans and aerosol containers are kept.

Officials have set up an 800-metre evacuation zone around the fire site. That radius will double to 1,600 metres if the fire starts up again, meaning six families will be forced to leave their homes.

The reserve has set up an alternate waste disposal site while it waits for the cleanup.

"The Six Nations Elected Council's priorities at this moment are for the safety of our community members, and the protection of the environment," the council said.

The reserve is home to about 12,000 people.