Section 142.310 - How can a person served by the public water system obtain EPA review of a State proposed small system variance?(a) Any person served by the public water system may petition the Administrator to object to the granting of a small system variance within 30 days after a State proposes to grant a small system variance for a public water system.(b) The Administrator must respond to a petition filed by any person served by the public water system and determine whether to object to the small system variance under § 142.311 , no later than 60 days after the receipt of the petition.