California Attorney General Opinion 24-1101

CourtCalifornia Attorney General Reports
DecidedMay 20, 2026
Docket24-1101
StatusPublished

This text of California Attorney General Opinion 24-1101 (California Attorney General Opinion 24-1101) is published on Counsel Stack Legal Research, covering California Attorney General Reports primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
California Attorney General Opinion 24-1101, (Cal. 2026).

Opinion

TO BE PUBLISHED IN THE OFFICIAL RECORDS

OFFICE OF THE ATTORNEY GENERAL State of California

ROB BONTA Attorney General

_______________

: OPINION : : No. 24-1101 of : : May 20, 2026 ROB BONTA : Attorney General : : SUSAN DUNCAN LEE : Deputy Attorney General :

The HONORABLE KELLY SEYARTO, STATE SENATOR, has requested an opinion on a question relating to local regulation of public water systems.

QUESTION PRESENTED AND CONCLUSION

Do the exemptions from local building and zoning ordinances set forth in Government Code section 53091 apply to all California “public water systems,” including those privately owned by mutual water companies?

No, the exemptions from local building and zoning ordinances set forth in Government Code section 53091 do not apply to privately owned public water systems, such as those owned by mutual water companies, but apply only to publicly owned water systems.

BACKGROUND

California’s Constitution authorizes both public agencies and private companies to operate public water systems. 1 State law classifies a water system that delivers drinking

1 See Cal. Const., art. XI, § 9, subd. (a) (“A municipal corporation may establish, (continued…)

1 24-1101 water to 15 or more connections as a “public water system,” regardless of whether the system is publicly or privately owned. 2 An information sheet published by the State Water Resources Control Board explains:

Many people think of public water systems as large city or regional water suppliers, but they also include small housing communities, businesses and even schools and restaurants that provide water. A public water system is not necessarily a public entity, and most public water systems are privately owned. 3

Accordingly, despite its nomenclature, a “public water system” is not necessarily a public agency. Rather, a “public water system” is a water system generally having 15 or more service connections or servicing at least 25 individuals per day. 4 Thus the word

purchase, and operate public works to furnish its inhabitants with . . . water”); id., subd. (b) (“Persons or corporations may establish and operate works for supplying [water] services upon conditions and under regulations that the city may prescribe under its organic law”). 2 Health and Safety Code section 116275(h) states: “Public water system” means a system for the provision of water for human consumption through pipes or other constructed conveyances that has 15 or more service connections or regularly serves an average of at least 25 individuals daily at least 60 days out of the year. A public water system includes the following: (1) Any collection, treatment, storage, and distribution facilities under control of the operator of the system that are used primarily in connection with the system. (2) Any collection or pretreatment storage facilities not under the control of the operator that are used primarily in connection with the system. (3) Any water system that treats water on behalf of one or more public water systems for the purpose of rendering it safe for human consumption. 3 Cal. Water Resources Control Board, What is a Public Water System?, https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/waterp artnerships/what_is_a_public_water_sys.pdf (as of May 18, 2026); cf. Cal. Water Quality Monitoring Council, Unregulated Drinking Water, https://mywaterquality.ca.gov/safe-to- drink/unregulated-drinking-water.html (as of May 18, 2026) (“Unlike regulated water supplies, people who obtain their drinking water from an unregulated water supply, such as a privately drilled well, a shallow dug well, a stream, a spring, a pond, a lake, or a cistern, are responsible for determining the safety of the water themselves”). 4 Health & Saf. Code, § 116275, subd. (h).

2 24-1101 “public” in “public water system” refers to the number and nature of consumers receiving water service, not to the status of the entity providing the service.

Public or private, all “public water systems” in California are subject to the Safe Drinking Water Act, which imposes a range of requirements on systems that supply drinking water to consumers. 5 The Act imposes construction standards for building and upgrading waterworks; 6 criteria governing the organization, operation, and management of public water systems; 7 water testing; 8 mitigation measures when needed to bring water up to standards; 9 and associated technical and fiscal support programs. 10

The regulatory structure is enforced by requiring a public water system operator to hold a permit from the Water Resources Control Board. 11 The Board may revise or amend the permit, imposing new requirements or demanding correction of deficiencies, whenever necessary to protect public health. 12

In addition to these statewide requirements, public water systems may be subject to city and county regulations, such as zoning and building ordinances. A zoning ordinance is local legislation regulating the use of land and buildings, such as rules designating specified areas for residential, commercial, or other uses, and rules controlling the location, scale, or density of development. 13 A building ordinance is local legislation regulating the construction, alteration, or materials used in buildings and other

5 Health & Saf. Code, § 116270, subd. (e) (“This chapter is intended to ensure that the water delivered by public water systems of this state shall at all times be pure, wholesome, and potable”); see generally California Safe Drinking Water Act, Health & Saf. Code, §§ 116270-116755 (applying clean water laws to all public water systems); Corp. Code, §§ 14300.5, 14301.1-14301.3 (providing for formation of mutual water companies and subjecting them to clean water laws). 6 See Health & Saf. Code, § 116275, subd. (q) (for purposes of California Safe Drinking Water Act, “waterworks standards” means regulations adopted at Cal. Code Regs., tit. 22, ch. 16, §§ 64551-64644). 7 See Health & Saf. Code, §§ 116600-116601. 8 See Health & Saf. Code, §§ 116287, subd. (c), 116385-116400. 9 See Health & Saf. Code, § 116525, subd. (c). 10 State Water Resources Control Board, Financial Assistance Funding—Grants and Loans, https://www.waterboards.ca.gov/water_issues/programs/grants_loans/ (as of May 18, 2026). 11 See Health & Saf. Code, § 116525. 12 See ibid. 13 See Gov. Code, § 65850 (local zoning power).

3 24-1101 structures. 14 The question here is whether privately owned public water systems are treated the same as publicly owned public water systems for purposes of Government Code section 53091, which exempts certain public water projects from local building and zoning ordinances. We conclude the exemptions do not apply to privately owned systems.

ANALYSIS

Government Code Section 53091 Exempts Designated Public Agencies from Local Building and Zoning Ordinances.

Under Government Code section 53091, certain public agencies are exempted from local building and zoning ordinances. Section 53091 states in relevant part:

(a) Each local agency shall comply with all applicable building ordinances and zoning ordinances of the county or city in which the territory of the local agency is situated.

[⁋⁋]

(d) Building ordinances of a county or city shall not apply to the location or construction of facilities for the production, generation, storage, treatment, or transmission of water, wastewater, or electrical energy by a local agency.

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California Attorney General Opinion 24-1101, Counsel Stack Legal Research, https://law.counselstack.com/opinion/california-attorney-general-opinion-24-1101-calag-2026.