N.H. Code Admin. R. Env-Dw 714.09 – Monitoring Requirements for Water Quality Parameters

(a) The O/O of a water system that is subject to this part shall comply with the monitoring requirements for water quality parameters specified in 40 CFR §141.87, 7-1-16 edition, as modified by Table 714-1, below, subject to the notes in (b), below:
Table 714-1: Summary of Monitoring Requirements for Water Quality Parameters
Monitoring period; Location
Parameters
Frequency
Initial water quality monitoring:
- Taps
- Entry point(s) to distribution system
- pH
- alkalinity
- conductivity
- water temperature
- calcium ^A
- orthophosphate ^B
- silica ^C
As specified in 40 CFR §141.87, except that the frequency shall be twice in 90 days after the date of action level exceedance
Routine water quality monitoring:
- Taps
- pH
- alkalinity
- calcium ^A
- orthophosphate ^B
- silica ^C
As specified in 40 CFR §141.87, except that the frequency shall be every 3 months for parameters to be reported twice during each monitoring period
- Entry point(s) to distribution system
- pH
- alkalinity ^D
- inhibitor ^E
No less frequently than every 2 weeks
Optimal water quality parameters:
- Taps
- pH
- alkalinity
- calcium ^A
orthophosphate ^B
- silica ^C
Every 6 months
- Entry points(s) to distribution system
- pH
- alkalinity ^D
- inhibitor ^E
No less frequently than every 2 weeks ^F
Reduced water quality monitoring:
- Taps
- pH
- alkalinity
- calcium ^A
- orthophosphate ^B
- silica ^C
Every 6 months, annually or every 3 years; reduced number of sites
- Entry point(s) to distribution system
- pH
- alkalinity ^D
- inhibitor ^E
No reductions; continues no less frequently than every 2 weeks ^F
(b) The following notes shall apply to Table 714-1:
1. (1) “A” means that calcium analysis is required only if calcium carbonate stabilization is used as part of corrosion control;
2. (2) “B” means that orthophosphate analysis is required only if an inhibitor containing a phosphate compound is used;
3. (3) “C” means that silica analysis is required only if an inhibitor containing a silicate compound is used;
4. (4) “D” means that analysis of the dosage rate of the chemical used to adjust alkalinity and the alkalinity concentration is required only if alkalinity is adjusted as part of corrosion control;
5. (5) “E” means that analysis of the dosage rate of the inhibitor used and the concentration of orthophosphate or silica, as applicable, is required only if a corrosion inhibitor is used as part of corrosion control; and
6. (6) “F” means that the system O/O shall maintain a log which identifies, for each sample taken, the date the sample was taken, the sampling location, and the result.

Source. #9859, eff 2-8-11; ss by #12181, eff 5-23-17