Excellent site just south of CF- Le Clos Auroy at Orcet. Exit 5 from the autoroute. Big pitches, good facilities, Dutch run, quiet.
Good base to visit volcano region - well worth a visit if you have not been before, but pick a fine day.
Sorry can't help with Dreux although friends use the municipal at Nonacourt and report it better than you would expect given the industrial nature of the town.
Shouldn't be too busy as befoe the main french holiday season.