New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Ws - Division of Water
Chapter Env-Ws 300 - NEW HAMPSHIRE DRINKING WATER RULES
Part Env-Ws 380 - FILTRATION, DISINFECTION, TREATMENT PLANT AND WASTE RECYCLING
Section Env-Ws 380.05 - Criteria for Avoiding Filtration

(a) The department shall determine which public water systems use groundwater under the direct influence of surface water.

(b) The department shall determine in the case of each public water system that is a SW/GWUDISW whether filtration is required. This determination shall be based on the criteria in Env-Ws 380.06 through Env-Ws 380.07.

(c) The owner of a public water system that uses a surface water source shall meet all of the conditions of Env-Ws 380.06 through Env-Ws 380.07, and shall be subject to Env-Ws 380.08, unless the departmenthas determined that filtration is required. If the department determines that filtration is required the department shall notify the system in writing. The system shall install filtration and meet the criteria for filtered systems specified in Env-Ws 380.11 and Env-Ws 380.12.

(d) The owner of a public water system that uses a ground water source under the direct influence of surface water shall meet all of the conditions of Env-Ws 380.06 through Env-Ws 380.07, and shall be subject to Env-Ws 380.08, unless the department has determined that filtration is required. If the department determines that filtration is required, the department shall notify the system in writing. The system shall install filtration and meet the criteria for filtered systems specified in Env-Ws 380.11 through Env-Ws 380.12.

(e) Within 18 months of the failure of a system using SW/GWUDISWto meet any one of the requirements of Env-Ws 380.06 through Env-Ws 380.07, the ownershall install filtration and meet the criteria for filtered systems specified in Env-Ws 380.11 through Env-Ws 380. 12.