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 380.21 - Reporting and Recordkeeping Required for Systems Using Filtration

Universal Citation: NH Admin Rules Env-Ws 380.21

Current through Register No. 13, March 27, 2025

(a) A public water system owner that uses a SW/GWUDISW and provides filtration treatment shall report monthly to the department the turbidity measurements as required by Env-Ws 380.12 within 10 days after the end of each month the system serves water to the public, as follows:

(1) The total number of filtered water turbidity measurements taken during the month;

(2) The number and percentage of filtered water turbidity measurements taken during the month which are less than or equal to the turbidity limits specified in Env-Ws 380.12 for the filtration technology being used; and

(3) The date and value of any turbidity measurements taken during the month which exceed 5 NTU.

(b) A public water system owner that uses SW/GWUDISW shall report disinfection information specified in Env-Ws 380.11 to the departmentwithin 10 days after the end of each month the system serves water to the public as follows:

(1) For each day, the lowest measurement of residual disinfectant concentration in mg/l in water entering the distribution system;

(2) The date and duration of each period when the residual disinfectant concentration in water entering the distribution system fell below 0.2 mg/l and when the department was notified of the occurrence; and

(3) The following information on the samples taken in the distribution system in conjunction with total coliform monitoring pursuant to Env-Ws 325:
a. The number of instances where the residual disinfectant concentration is measured;

b. The number of instances where the residual disinfectant concentration is not measured but heterotrophic bacteria plate count is measured;

c. The number of instances where the residual disinfectant concentration is measured but not detected and no HPC is measured;

d. The number of instances where no residual disinfectant concentration is detected and where HPC is >500/ml;

e. The number of instances where the residual disinfectant concentration is not measured and HPC is >500/ml; and

f. For the current and previous month the system serves water to the public, the value of "V" calculated in Env-Ws 380.11.

(c) A system ownershall not be required to continue to report the data listed in (b) of this section if all data listed in (b) above remain on file at the system and the department determines that the system owner has submitted all the information required by (b)(1) through (3) above for at least 12 months.

(d) Each system owner, upon discovering that a waterborne disease outbreak potentially attributable to that water system has occurred, shall report that occurrence to the department as soon as possible, but no later than by the end of the next business day after such discovery.

(e) If at any time the turbidity exceeds 5 NTU, the system ownershall inform the department as soon as possible, but no later than the end of the next business day after such discovery.

(f) If at any time the residual falls below 0.2 mg/l in the water entering the distribution system, the system shall notify the department as follows:

(1) As soon as possible, but no later than by the end of the next business day after such discovery; and

(2) By the end of the next business day whether or not the residual was restored to at least 0.2 mg/l within 4 hours.

#5098, eff 3-18-91, EXPIRED 3-18-97

New. #6521, eff 6-4-97 (See Revision Note at chapter heading for Env-Ws 300); ss by #8352, eff 5-14-05 (formerly part of Env-Ws 380.25 )

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