*407 Opinion
Aрpellants are the owners of residences in the City of Concord served by the water system of respondent Contra Costa County Water District. Each of the appellants maintains on his property a well from which water is drawn for such purposes as gardening and car-washing. Although appellants had not connected their well water systems to the pipes of the district’s public system, the district threatens to terminate servicе until the affected householders agree to have installed, at their own expense, a “double check valve assembly,” designed to prevent water from the auxiliary supply from “backing up” into and contaminating the public water supply. Appellants sought from the court protection against the district’s threat; judgment was for the district, and the present appeal followed. We affirm the judgment.
The record shows without contradiction that contamination of a water system can occur if there is a physical connection between the public system and auxiliary water supply, such as where the two. systems are connеcted by pipes, or where the auxiliary water is “impounded” (e.g., in a swimming pool or fish pond) and an ordinary garden hose from the public water supply is allowed to lie in water from the auxiliary system. In the latter situatiоn a temporary loss of pressure can result in contaminated water being drawn into the public system.
Protection against this risk can be provided by installing in the consumer’s water meter box a device which prevents a backward flow of water. The directors of respondent district have established an installation charge of $35, and a $.25 per month maintenance charge, for such devices, based on the cost thereof to the district. Appellants receive no special benefit from the device other than that which they receive as members of the general public.
It will be useful to outline the statutory framework under which respondent is requiring the installation of the back flow prevention device. Health and Safety Code section 203 provides that the State Department of Public Health “shall examine and may prevent the рollution of sources of public domestic water . . . supply.” The department may “adopt and enforce rules and regulations” for this purpose. (Health & Saf. Code, § 208.) Pursuant to these statutes, the department adopted administrative regulations designed to prevent contamination or pollution of any public water supply as a result of “actual or potential cross-connections” with auxiliary water suppliеs. (Cal.Admin.Code, tit. 17, § 7583, italics added.) An auxiliary water supply is defined as “any water supply on or available to the premises other than the public water supply.” (Cal.Admin.Code, tit. *408 17, § 7590.) A protective device is required to bе installed on any premises receiving water from the public water system and containing an auxiliary water supply, regardless of whether the auxiliary water supply is connected to the public water system. (Cal.Admin.Code, tit. 17, § 7603.) The regulations specify various types of protective devices, depending on the “degree of hazard” involved; where the auxiliary and public water supplies are not connected, the рrotective device required is a “double check valve assembly,” which is what respondent desires appellants to install. (Cal. Admin.Code, tit. 17, § 7604, subd. 1.) Responsibility for installing the protective device is placed on thе water user. (Cal.Admin.Code, tit. 17, § 7603.) Pursuant to the foregoing state regulations, respondent adopted its own regulations providing for discontinuance of water service to any consumer who failed to install the required dеvice.
Appellants contend that the requirement that they install a protective device constitutes a taking of property which must be compensated. They argue that they have the right to take watеr from their wells and that respondent’s demand infringes on their right to use their property as they wish. This contention confuses an exercise of the police power with an exercise of the power of eminent domain; “the constitutional guarantee of just compensation attached to an exercise of the power of eminent domain does not extend to the state’s exercise of its police рower, and damage resulting from a proper exercise of the police power is simply
damnum absque injuria” (Lees
v.
Bay Area Air, etc. Control Dist.
(1965)
Appellants also argue thаt it is unreasonable to require them to pay for the cost of installation and maintenance as their property receives no special benefit from the prevention device. It is argued that, since the device is for the benefit of the public, the public should pay for it. A similar contention was made in
Atchison, Topeka & S. F. R. Co.
v.
Public Util. Com.
(1953)
Aрpellants next contend that the term “auxiliary water supply” used in the regulation is unconstitutionally vague, as it leaves the determination of what constitutes an auxiliary water supply to respondent’s unfettered discretion. Title 17, section 7590, of the California Administrative Code defines “auxiliary water supply” as “any water supply on or available to the premises other than the public water supply.” This definition is not so vague and ambiguous as to be unenforceable.
*410 Appellants argue that the district is without statutory authority to charge them for installation and maintenance of the protective device, as the County Water District Lаw (Wat. Code, § 30000 et seq.) provides the sole means by which respondent may finance public improvements. Respondent has not attempted to raise funds for installation of protective devices by any of the methods specified in the County Water District Act. (See Wat. Code, §§ 31501, 31502, 31503.) But section 31024 authorizes a water district to “establish rules and regulations for the sale, distribution, and use of water. ..” The protective device is not a public improvement but a condition for appellants’ use of the public water supply, a condition which respondent is authorized to impose under section 31024. Moreover, Water Code section 30060 provides that the County Water District Law shall not “be so construed as repealing or in anywise modifying any other law relating to water or the supply of water . . . .” The Department of Public Health regulations, authorized under Health and Safety Code sections 203 and 208, require that responsibility for installing the protective device be placed on the water user. Therefore the statutes do authorize respondent to require aрpellants to pay for the cost of installing and inspecting the protective device.
Appellants contend that due process entitled them to notice and a hearing before respondent could demand that they either install the device or have their water service discontinued. But respondent was merely enforcing a lawful state regulation in making the demand. State law requires that before the regulations could be adopted there must be notice and a hearing at which any interested person could appear to oppose the proposed regulations. (Gov. Code, § 11420 et seq.) There is no requirement that a new notice and hearing be given in each individual case before an agency can enforce a valid statute or regulation.
The judgment is affirmed.
Devine, P. J., and Rattigan, J., concurred.
