Section Env-Ws 381.30 - Lead and Copper Reduced Source Water Monitoring(a) The owner of a water system using only groundwater may reduce the monitoring frequency for lead and copper in source water to once during each 9-year compliance cycle if:(1) The system demonstrates that finished drinking water entering the distribution system has been maintained below the maximum permissible lead and copper concentrations specified by Env-Ws 381.12 during at least 3 consecutive compliance periods under Env-Ws 381.29; or(2) The system demonstrates that, during at least 3 consecutive compliance periods in which sampling was conducted under Env-Ws 381.29, the concentration of lead in source water was less than or equal to 0.005 mg/L and the concentration of copper in source water was less than or equal to 0.65 mg/L.(b) The owner of a water system using surface water, or a combination of surface water or ground water, may reduce the monitoring frequency in Env-Ws 381.29(b) and (c) to once during each 9-year compliance cycle if:(1) The system demonstrates that finished drinking water entering the distribution system has been maintained below the maximum permissible lead and copper concentrations specified by Env-Ws 381.12(d) and (e) for at least 3 consecutive years; or(2) The system demonstrates that during at least 3 consecutive years, the concentration of lead in source water was less than or equal to 0.005 mg/L and the concentration of copper in source water was less than or equal to 0.65 mg/L.(c) The owner of a water system using a new source of water shall not be eligible for reducing monitoring for lead or copper until concentrations in samples collected from the new source during 3 consecutive monitoring periods are below the maximum permissible lead and copper concentrations specified in Env-Ws 381.12.N.H. Code Admin. R. Env-Ws 381.30
(See Revision Note at chapter heading for Env-Ws 300) #6521, eff 6-4-97, ss by #7734, eff 8-2-02