Keep public-water-system records by document type and the applicable retention rule, not one blanket disposal date. The general federal schedule uses different periods for microbiological, turbidity and chemical results, violation corrections, sanitary surveys and notices. Preserve required sample details and confirm additional program requirements before deleting records or relying solely on a contractor’s archive.
Which retention schedule governs the file?
Start with the actual regulated system, its responsible operator and the programs that apply. Arizona’s R18-4-106 incorporates federal reporting and recordkeeping provisions in 40 CFR 141 Subpart D. R18-4-102 identifies the July 1, 2025 federal version and includes effective-date notes. Do not substitute a plumbing contractor’s ordinary invoice policy for the supplier’s compliance obligations.
Under 40 CFR 141.33, microbiological and turbidity analysis records are kept for at least five years, while chemical analysis records are kept for at least ten years. These are different document categories. Keep a record long enough to meet every applicable requirement rather than giving the entire file the shorter period.
What information makes an analysis record usable?
The rule permits actual laboratory reports or tabular summaries containing the required details. These include the sampling date, place and time, collector, sample purpose, analysis date, responsible laboratory and analyst, method and results. A spreadsheet of pass/fail labels lacks much of that information.
Maintain a consistent system and sample-location reference so a result can be connected to the appropriate sample-siting plan. Keep original reports and the context needed to explain corrections, amended results or uncertain locations. Do not rewrite an old result to match a later satisfactory sample.
Which documents use a different clock?
Section 141.33 sets at least three years after the last corrective action for records of actions taken to correct a violation. Sanitary-survey reports, summaries and related communications are retained for at least ten years after the survey. Public notices and their certifications are kept for three years after issuance. These dates do not all begin when a folder was created.
Monitoring plans generally follow the retention period for analyses taken under the plan, except where another provision specifies otherwise. Other programs have additional recordkeeping requirements; lead-and-copper records are addressed separately in Section 141.91. Confirm the applicable program and transition provisions before deleting a document on the general schedule alone.
Keep the file for sanitary-survey preparation distinct from the record of a missed-monitoring notice. Their shared subject matter does not make their retention requirements identical.
Who retains access when work is outsourced?
Arizona permits a laboratory or agent to report monitoring results, but R18-4-106 keeps legal reporting responsibility with the public water system. Specify how the owner and responsible operator obtain reports, submission evidence and retained records if personnel or vendors change.
Federal Section 141.31 also requires supplying requested records to the state within its stated request period. Keep the records at the required premises or convenient nearby location, and maintain usable copies and retrieval arrangements. An inaccessible contractor archive or a completed repair is not a substitute for the required record file.