NAC445A.456. Secondary standards: Monitoring; reports; public notice; plan to return water system to compliance.

     1. The secondary maximum contaminant levels must be monitored annually for public water systems which have surface water sources or groundwater sources under the direct influence of surface water, and at least once during every 3-year compliance period for systems with groundwater sources, unless otherwise required by the Division or the appropriate district board of health. Samples must be collected at sample points which are representative of each source after any treatment.

     2. If the result of an analysis made pursuant to subsection 1 indicates that any secondary maximum contaminant level listed in NAC 445A.455 is exceeded, the supplier of water must report that result to the Division or the appropriate district board of health within 30 days and initiate three additional analyses at the same sampling point within 90 days. When the average of four analyses made pursuant to this subsection exceeds the secondary maximum contaminant level, the supplier of water must notify the Division or the appropriate district board of health and give notice to the public pursuant to subsection 3 of NAC 445A.485.

     3. Monitoring after public notification must be at a frequency designated by the Division or the appropriate district board of health and must continue until the level has not been exceeded during two successive quarterly periods or until a monitoring schedule as a condition to a variance or enforcement action to achieve compliance becomes effective.

     4. A supplier of water is not required to report results to the Division or the appropriate district board of health where a state laboratory performs the analysis and reports the results to the Division or the appropriate district board of health. Except as otherwise provided in this subsection, the public water system shall provide the results of any analysis performed pursuant to this section to the Division or to the appropriate district board of health by the 10th day of the month following receipt of the results.

     5. The public water system shall, within 6 months after giving the notice required by subsection 2, develop a plan to return the water system to compliance. This plan must be submitted to, and be approved by, the Division or the appropriate district board of health and may include:

     (a) Acquisition of another suitable supply of water which is economically feasible to obtain, available in sufficient quantity, and of significantly higher or acceptable quality;

     (b) Consolidation with an adjacent public water system that provides water of sufficient quantity and quality;

     (c) Treatment of the source water; or

     (d) Any other action sufficient to return the water system to compliance.

     [Bd. of Health, Water Quality Standards Art. 4 §§ 4.3-4.3.3.3, eff. 12-14-77]—(NAC A by Environmental Comm’n by R126-05, 10-31-2005)