Cal. Water Code § 60326

The operator of each water-producing facility within the district, on or before the last day of the month immediately following the respective quarterly periods ending March 31st, June 30th, September 30th, and December 31st of each year, shall file with the district a sworn statement setting forth the total production in acre-feet of ground water from such water-producing facility during the respective quarterly periods immediately preceding the filing of the respective statements, a general description or number locating such water-producing facility, and the method or basis of the computation of such ground water production. Each statement also shall contain such other information as the district may require. The first such statement required to be filed after the formation of such district shall cover the first calendar quarter commencing not less than thirty (30) days after such formation. If the board by its resolution determines that additional reports or statements are necessary or useful to carry out the purposes of this act and to administer the replenishment of the ground water supplies within the district, then the board shall by its resolution so declare and shall give notice of the adoption of said resolution by immediately publishing the same in each affected county pursuant to Section 6061 of the Government Code. Effective thirty (30) days after such publication, the operator of each water-producing facility in such district shall file with the district the report or statement required by such resolution, at such times and in such manner and form as are provided in such resolution.