(a) Napa County contains the following public notice districts:
(1) Calistoga District, which is comprised of the City of Calistoga.
(2) Napa District, which is comprised of the Cities of American Canyon, Napa, and Yountville.
(3) St. Helena District, which is comprised of the City of St. Helena and the unincorporated areas known as Angwin, Oakville, and Rutherford.
(b) For the purpose of publishing notice arising from a location within Napa County that is not within one of the districts described in subdivision (a):
(1) If the location is within 10 miles of a district, notice shall be published in the nearest district.
(2) If the location is not within 10 miles of a district, notice shall be given as if the location is in a public notice district without a newspaper of general circulation.