A festival-goer, who wished not to be named, said he was unaware the area had a total fire ban but the pyrotechnics "looked good and it was controlled".
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"It was a fun event, many people had a blast and would love the organisers to do another one," he said.
"There was all the safety precautions taken first with water hoses and fire extinguishers. The area that there was fire was on dirt, with nothing in range of catching on fire and there were many on patrol to make sure all was good."
In a statement, police said the 34-year-old man is due to appear in Nelson District Court on Monday.
"Police would like to remind people in the Tasman/Marlborough District that a fire ban remains in place," they said.
"If there is any doubt about what activities are restricted they can visit the FENZ website."