(a) For purposes of this section, the following terms have the following definitions:

1. (1) “Adequate supply” has the same meaning as set forth in subdivision (a) of Section 116681 of the Health and Safety Code.
2. (2) “Domestic well” has the same meaning as set forth in subdivision (i) of Section 116681 of the Health and Safety Code.
3. (3) “Safe drinking water” has the same meaning as set forth in subdivision (o) of Section 116681 of the Health and Safety Code.
4. (4) “State board” means the State Water Resources Control Board.

5. (5) “Water system” means all of the following:

   1. (A) A public water system, as defined in subdivision (h) of Section 116275 of the Health and Safety Code.
   2. (B) A state small water system, as defined in subdivision (n) of Section 116275 of the Health and Safety Code.
   3. (C) A tribal water system. For purposes of this subparagraph, “tribal water system” means a tribal water system included by the state board in the drinking water needs assessment conducted and relied upon by the state board to inform its annual fund expenditure plan pursuant to subdivision (b) of Section 116769 of the Health and Safety Code, as that assessment may be updated pursuant to Article 6 (commencing with Section 116772) of Chapter 4.6 of Part 12 of Division 104 of the Health and Safety Code.
6. (6) “Well” means a wellhead that provides drinking water to a water system.
7. (7) “Well project” means a project for the construction, maintenance, repair, or replacement of a well or a domestic well.

(b) This division does not apply to a well project that meets all of the following conditions:

1. (1) The domestic well or water system to which the well is connected has been designated by the state board as high risk or medium risk in the state board’s drinking water needs assessment conducted and relied upon by the state board to inform its annual fund expenditure plan pursuant to subdivision (b) of Section 116769 of the Health and Safety Code, as that assessment may be updated pursuant to Article 6 (commencing with Section 116772) of Chapter 4.6 of Part 12 of Division 104 of the Health and Safety Code.
2. (2) The well project is designed to mitigate or prevent a failure of the well or the domestic well that would leave residents that rely on the well, the water system to which the well is connected, or the domestic well without an adequate supply of safe drinking water.

3. (3) The lead agency determines all of the following:

   1. (A) The well project is not designed primarily to serve irrigation or future growth.
   2. (B) The well project does not affect wetlands or sensitive habitats.
   3. (C) Unusual circumstances do not exist that would cause the well project to have a significant effect on the environment.
   4. (D) The well project is not located on a site that is included on any list compiled pursuant to Section 65962.5 of the Government Code.
   5. (E) The well project does not have the potential to cause a substantial adverse change in the significance of a historical resource.
   6. (F) The well project’s construction impacts are fully mitigated consistent with applicable law.
   7. (G) The cumulative impact of successive reasonably anticipated projects of the same type as the well project, in the same place, over time, is not significant.

(d)

1. (1) A lead agency that determines that a well project is exempt pursuant to this section shall file a notice of exemption, as described in Section 15062 of Title 14 of the California Code of Regulations, with the Office of Planning and Research in the manner specified in subdivisions (b) and (c) of Section 21108 and with the county clerk in the manner specified in subdivisions (b) and (c) of Section 21152.

2. (2) When a lead agency files a notice of exemption pursuant to paragraph (1), the lead agency shall also include the following information:

   1. (A) Whether Section 21080 or 21080.47 of this code or Section 15301 or 15302 of Title 14 of the California Code of Regulations could apply to the well project.
   2. (B) If Section 21080 or 21080.47 of this code or Section 15301 or 15302 of Title 14 of the California Code of Regulations do not apply to the well project, the reason that the sections do not apply.