S.C. Code Regs. 61-58.15.C - Routine Monitoring

Current through Register Vol. 46, No. 3, March 25, 2022

(1) Monitoring
(a) If a system submitted an IDSE report, they must begin monitoring at the locations and months recommended in the IDSE report submitted under sectionR.61-58.14.G following the schedule inR.61-58.15.B(2), unless the Department requires other locations or additional locations after its review. If the system submitted a 40/30 certification under sectionR.61-58.14.E or they qualified for a very small system waiver under sectionR.61-58.14.F or they are a non-transient non-community water system serving less than 10,000 people, they must monitor at the location(s) and dates identified in their monitoring plan in R.61-58.13.C(6), updated as required by section R.61-58.15.D.
(b) Systems must monitor at no fewer than the number of locations identified in this paragraph (1)(b).

Source water type

Population size category

Monitoring frequency

Distribution system monitoring locations per monitoring period

Subpart H

Less than 500

per year

2

Subpart H

500 - 3,300

per quarter

2

Subpart H

3,301 - 9,999

per quarter

2

Subpart H

10,000 - 49,999

per quarter

4

Subpart H

50,000 - 249,999

per quarter

8

Subpart H

250,000 - 999,999

per quarter

12

Subpart H

1,000,000 - 4,999,999

per quarter

16

Subpart H

5,000,000 or greater

per quarter

20

Ground water

Less than 500

per year

2

Ground water

500 - 9,999

per year

2

Ground water

10,000 - 99,999

per quarter

4

Ground water

100,000 - 499,999

per quarter

6

Ground water

500,000 or greater

per quarter

8

(i) All systems must monitor during month of highest DBP concentrations.
(ii) Systems on quarterly monitoring must take dual sample sets every 90 days at each monitoring location, except for subpart H systems serving 500-3,300. Systems on annual monitoring and subpart H systems serving 500-3,300 are required to take individual TTHM and HAA5 samples (instead of a dual sample set) at the locations with the highest TTHM and HAA5 concentrations, respectively. Only one location with a dual sample set per monitoring period is needed if highest TTHM and HAA5 concentrations occur at the same location (and month, if monitored annually).
(c) Undisinfected systems that begin using a disinfectant other than UV light after the dates in R.61-58.14 for complying with the Initial Distribution System Evaluation requirements must consult with the Department to identify compliance monitoring locations for this part R.61-58.15. The systems must then develop a monitoring plan under R.61-58.15.D that includes those monitoring locations.
(2) Analytical Methods - Analyses used to determine compliance with this part R.61-58.15 must by conducted using an approved method listed in 40 CFR 141.131 for TTHM and HAA5 analyses.
(3) Certified Laboratory - Analyses under this part R.61-58.15 for disinfection byproducts must be conducted by a certified laboratory.

Notes

S.C. Code Regs. 61-58.15.C

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