2.3 Operational Logs, Records Retention & Compliance Reporting
Key Takeaways
- 15A NCAC 08G .0204(5) requires the ORC to document operation, maintenance, and all visitation of the system in a log that is maintained at the system, and .0204(4) requires the ORC to certify by signature the validity of all monitoring and reporting information.
- Drinking water test results must be reported monthly on Department forms signed by the ORC and submitted by the 10th day of the following month, and records documenting compliance with 15A NCAC 18C Section .1300 must be kept on the premises for at least three years.
- Federal drinking water recordkeeping under 40 CFR 141.33 requires bacteriological results for at least five years and chemical analyses for at least ten years; lead and copper records are kept for 12 years.
- NPDES permittees must retain monitoring records, calibration and maintenance records, and copies of reports for at least three years under 40 CFR 122.41(j)(2), and must report noncompliance that endangers health or the environment within 24 hours with a written report within five days.
- Cross-connection control program records under 15A NCAC 18C .0406(b)(6) apply to systems with five or more testable assemblies, and field test results must be kept a minimum of four years.
2.3 Operational Logs, Records Retention & Compliance Reporting
[!IMPORTANT] The log is the evidence. In an enforcement case the logbook is what proves a certified operator visited the system at the required frequency, ran the required tests, and made the adjustments recorded on the monthly report. Falsifying it is grounds for revocation under G.S. 90A-26 and G.S. 90A-41 and can support criminal charges under G.S. 143-215.6B.
What the rules actually require in the log
Wastewater — 15A NCAC 08G .0204(5): the ORC shall "document the operation, maintenance, and all visitation of the system in a log that shall be maintained at the system." Paragraph (4) adds that the ORC shall "certify by signature the validity of all monitoring and reporting information performed on the system as prescribed in any permit issued for the system" and provide the owner a copy of the monitoring and reporting forms.
Drinking water — 15A NCAC 18C .1303(a): during each oversight visit the operator performs a visual inspection from source to entry point, adjusts equipment settings, fills chemical feed tanks as needed, records the dates and quantities of chemicals added, and performs the physical and chemical tests required on the plant monthly operation report.
A defensible entry therefore includes, at minimum:
- Date and the times of arrival and departure — this is what demonstrates compliance with the 20 percent rule or the five-day-per-week rule.
- Printed name, signature, and certificate number of the visiting operator, and the role held (ORC, Back-up ORC, certified operator on duty, temporary ORC).
- Chemicals: product and strength, quantity added or consumed, tank levels, feed pump settings, drawdown results, and the calculated dose.
- Process control tests run on site: free and total chlorine, pH, turbidity, dissolved oxygen, settleability, temperature, and totalized flow.
- Adjustments and abnormal conditions: WAS and RAS rate changes, backwash initiations, alarms, outages, weather, equipment out of service.
Vague entries such as "checked plant, all OK" do not show what was inspected or tested and will not satisfy an inspector reconstructing a compliance question months later.
Where the log lives
The wastewater rule is explicit that the log is maintained at the system. For a collection system, the practical equivalent is the maintenance operations base where the collection records, inspection logs, and lift station run-time sheets are kept. Electronic logs are acceptable where the system provides an auditable record — user authentication, time stamps, and preservation of the original entry when an edit is made — but paper logs should be permanently bound with numbered pages so that pages cannot be inserted or removed.
Retention periods operators must know
| Record | Minimum retention | Source |
|---|---|---|
| Records documenting compliance with 15A NCAC 18C Section .1300 (operation of public water supplies) | 3 years on the premises | 18C .1302(b)(3) |
| NPDES monitoring records, calibration and maintenance records, original strip charts, and copies of reports | 3 years (extendable by the Director) | 40 CFR 122.41(j)(2) |
| Drinking water bacteriological analyses | 5 years | 40 CFR 141.33(a) |
| Drinking water chemical analyses | 10 years | 40 CFR 141.33(b) |
| Lead and copper monitoring and service line records | 12 years | 40 CFR 141.91 |
| Well disinfection records (ANSI/AWWA C654 compliance) | 3 years | 18C .1002(c) |
| Cross-connection control field test results and air gap inspections | 4 years | 18C .0406(b)(6)(F) |
| Press release and media distribution list for an untreated wastewater discharge | 1 year | G.S. 143-215.1C(b)(1) |
Monthly reporting channels
Drinking water. Under 18C .1302(b)(1) test results are documented and reported monthly on forms and in a format provided by the Department, signed by the ORC, and submitted to the Public Water Supply Section by the 10th day of the following month. Electronic submission is required for systems owned or operated by local governments and for all community systems serving 1,000 or more connections or 3,000 or more individuals; smaller community systems and all non-transient non-community systems also report electronically under .1302(b)(2). These are the monthly operating reports (MORs) operators know as eMORs.
Distribution residual monitoring. 18C .1302(a)(2) sets the weekly sampling load by distribution class in Table A: Class D systems take 1 residual disinfectant sample per week, Class C systems 3, and Class A and B systems 5, at locations representing maximum residence time or high water age designated on the sample siting plan. Samples collected on the same day must come from different locations. Systems using chloramines must also measure total chlorine, monochloramine, free ammonia, and pH daily at the entry point while the plant operates, and in the distribution system no less often than Table A.
Wastewater. NPDES permittees submit electronic discharge monitoring reports (eDMRs) on the schedule in the permit. Federal permit conditions in 40 CFR 122.41(l) require reporting of planned changes, anticipated noncompliance, and 24-hour reporting of any noncompliance that may endanger health or the environment, with a written submission within five days describing the noncompliance, its cause, its exact dates and duration (or expected duration), and the steps taken or planned to reduce, eliminate, and prevent recurrence.
[!WARNING] Signature equals certification. When the ORC signs an eDMR or eMOR, the signature certifies that the data are accurate and were produced by approved methods. Signing reports for a system the operator has not actually visited at the required frequency is the single most common route to a WPCSOCC or WTFOCB disciplinary action.
How long must records documenting compliance with 15A NCAC 18C Section .1300 be retained, and where?
A Class C distribution system uses free chlorine. Under Table A in 15A NCAC 18C .1302, how many residual disinfectant samples must be collected in the distribution system each week?
By what date must a North Carolina public water system submit its monthly operation report to the Public Water Supply Section?