(a) Guam EPA shall promulgate and enforce primary and secondary drinking water regulations to protect health using technology, treatment techniques, and other means which are generally available.

(b) Primary and secondary drinking water regulations promulgated pursuant to this Chapter shall be no less stringent than the National Primary Drinking Water Regulations and National Secondary Drinking Water Regulations in effect at that time.

(c) Primary and secondary drinking water regulations promulgated pursuant to this Chapter shall apply to each public water system in Guam, including those owned and operated by the government of Guam or federal agencies, unless it is a system:

(1) which consists only of distribution and storage facilities and does not have any collection and treatment facilities;

(2) which obtains all of its water from, but is not owned or operated by, a public water system to which such regulations apply;

(3) which does not sell water to any person; and

(4) which is not a carrier which conveys passengers in interstate commerce.

(d) Guam EPA shall adopt and implement procedures for the enforcement of primary and secondary drinking water regulations, including monitoring, inspection, and recordkeeping procedures which are no less stringent than the Federal Act.

(e) Guam EPA shall promulgate and enforce regulations relating to cross-connection control and backflow prevention. The regulations shall establish minimum criteria that must be met by all public water systems for the purpose of cross connection control and backflow prevention, and shall allow for the direct implementation by public water systems of cross connection control and backflow prevention programs that meet
the established criteria. Direct implementation of a cross connection control and backflow prevention program by a public water system shall not prevent Guam EPA from enforcing its regulations against a public water system or any person.

(f) Guam EPA shall promulgate regulations establishing an underground injection control program. Such program shall prohibit any underground injection which is not authorized by a permit issued by Guam EPA except that Guam EPA may authorize underground injection by regulation. Underground injection authorized by regulation shall not endanger drinking water sources. Any underground injection control program shall:

(1) set standards and prohibitions controlling any underground injection if such injection may result in the presence of any contaminant in underground water which supplies or may be expected to supply any public water system, and if the presence of such contaminant may result in such system not complying with any national primary drinking water regulations or may otherwise adversely affect the health of persons;

(2) require, in the case of a program which authorizes underground injection by permit, that the applicant for the permit satisfy the Guam EPA Administrator that the underground injection will meet the requirements of Subsection (f)(1) of this Section;

(3) conform to all requirements of the Federal Act and any applicable regulations promulgated thereunder; and

(4) include inspection, monitoring, recordkeeping, and reporting requirements.

(g) Following the date on which the USEPA determines that a primary drinking water regulation is to take effect, the Guam EPA may allow up to two (2) additional years to comply with a maximum contaminant level or treatment technique if the Guam EPA (in the case of an individual system) determines that additional time is necessary for capital improvements.