Get hauled potable water tested at a state-certified lab with a defensible chain of custody
domain: epa.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Use only a laboratory certified under your state's EPA-approved drinking water laboratory certification program, not just any generic environmental lab
Request the lab's chain-of-custody form in advance and confirm sample bottle type: municipal/chlorinated-source samples typically require a sodium-thiosulfate-treated bottle, while non-chlorinated sources use a plain sterile bottle
Collect the sample and get it to the lab within the required hold time — commonly 30 hours for public water supply samples and up to 48 hours for other water sources, though exact hold times are set by the certifying lab/state program
Fill out the chain-of-custody form completely (collector, time, location, source) and keep a copy with your operational hauling records
Retain lab results alongside your disinfection and hauling logs, since regulators may cross-check sample dates against your required monthly (or other periodic) testing schedule
Known gotchas
Using an uncertified lab — even a reputable general water-testing lab — can invalidate results for regulatory compliance purposes; certification status must be checked per-state, since EPA delegates certification programs to states
Missing the sample hold-time window is a common way a valid sample gets rejected after the fact, wasting the entire sampling trip
Chain-of-custody paperwork errors (missing signature, wrong bottle type) can be treated the same as a missed sample by an inspector, even if the water itself was fine
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