(1) (a) Except as provided in section 25-1-114.1 (3), any political subdivision or public water system which stores, releases, carries, conveys, supplies, or treats water for human consumption may bring suit to collect damages and for injunctive relief, in addition to all remedies otherwise available to prevent or abate any release or imminent release of contaminants or substances which, in water withdrawn for use, results or would likely result in:

(I) A violation, at the point where the contaminant or substance enters or would enter the intake of the water treatment system of the same or another political subdivision or public water system, of any minimum general sanitary standard or regulation adopted pursuant to this part 2, and the existing treatment system cannot effectively treat the contaminant or substance in question so as to assure that treated water complies with such standard or regulation; or

(II) Significant impairment of the normal operational capability of a water treatment system which meets the applicable specifications of the department for water treatment; or

(III) Rendering the system's drinking water supply unfit for human consumption. Where there are no minimum general sanitary standards, water shall be deemed unfit for human consumption where it is shown that the risk of adverse human health effects from exposure to carcinogens in that water is greater than one times ten to the minus sixth power or greater than the acceptable levels of exposure to noncarcinogens as determined by the reference dose method.

(b) Such an action may be maintained against any person who owns or operates the source or sources of the release of the contaminants, but no such action may be maintained with regard to surface or underground agricultural return flows except as otherwise provided in the "Colorado Chemigation Act", article 11 of title 35, C.R.S. Damages, including the costs of any remedy ordered or approved by the court shall include, as appropriate, those incurred in providing an interim substitute drinking water supply and monitoring and responding to the release or imminent release of contaminants or substances.

(2) Other remedies. Except as provided in this subsection (2), nothing in this section shall be construed to restrict or preempt any right which the state, the department, any public water system, or any other person may have under any other law to seek enforcement, in any court or in any administrative proceeding, of any provision of this section or any other relief regarding contamination of any drinking water supply. In addition, nothing in this section shall be construed to condition, restrict, or prevent any other civil or criminal actions which may be brought by the state or any political subdivision pursuant to any other state or federal statute or regulation or any local ordinance or regulation; except that, with respect to any release or substantial threat of release of a hazardous substance, pollutant, or contaminant addressed in pleadings or otherwise in a lawsuit brought pursuant to the federal "Comprehensive Environmental Response, Compensation and Liability Act", 42 U.S.C. sec. 9601 et seq., or by the terms and conditions of a remedial action plan, removal order, consent decree, or other order or decree entered or issued by a court or administrative body of competent jurisdiction pursuant to such federal act, any person or entity which is a defendant in such a lawsuit or is subject to the terms and conditions of such a remedial action plan, removal order, consent decree, or other order or decree, shall not be subjected with respect to the same release or substantial threat of release of a hazardous substance, pollutant, or contaminant to any suit, action, or liability pursuant to section 25-1-114.1 (3); nor shall such person or entity be subject to any suit, action, or liability initiated or prosecuted by a political subdivision or a public water system pursuant to this section with respect to any release or substantial threat of release of a hazardous substance, pollutant, or contaminant which has been addressed by relief granted, or by measures implemented or legally required to be implemented, pursuant to a lawsuit brought pursuant to such federal act or the terms and conditions of a remedial action plan, removal order, consent decree, or other order or decree entered or issued by a court or administrative body of competent jurisdiction pursuant to such federal act. Nothing in this section shall be construed to bar a political subdivision or public water system from seeking to recover pursuant to applicable law its damages which have been reasonably incurred for the protection of the human health if enforceable arrangements to pay such damages have not otherwise been made.