AI for environmental testing labs, tested on deliverables you already sent.

The clock starts in the field. Table II in 40 CFR 136.3 sets containers, preservatives and holding times for Clean Water Act samples, and its entries take precedence over the methods themselves. pH, total residual chlorine and temperature are analyzed within 15 minutes; bacteria incubation must start within 8 hours of collection. For an automatic 24-hour composite the holding time runs from the end of collection, and a composite that spans two calendar dates is dated with both, written like November 14-15. Every EDD row and every DMR line inherits those dates and times, so a draft that drops one is easy to catch.

Who may run the sample is set by rule. For the drinking water monitoring rules it covers, 40 CFR 141.28 counts a sample only if a lab certified by EPA or the state analyzed it. Alkalinity, disinfectant residual, orthophosphate, pH, silica, temperature and turbidity are the exceptions, which any person acceptable to the state may measure. Beyond that, TNI lists 14 state agencies as NELAP accreditation bodies, from the Florida Department of Health to Virginia's Department of General Services, and one NELAP body accepts a lab accredited by another, which TNI calls secondary accreditation.

The method has to be sensitive enough for the permit. Under 40 CFR 136.1(c) and 122.44(i), when more than one approved method exists, a permittee uses one whose minimum level sits at or below the permit limit, or the approved method with the lowest minimum level. So the method code and the limits on every line of an EDD or a DMR worksheet matter as much as the value beside them.

The lab is tested as well. Major NPDES permittees and selected minors take part in EPA's annual DMR-QA study, analyzing proficiency test samples bought from providers accredited by A2LA or ANAB. EPA's page puts Study 46, with chemistry, microbiology and whole effluent toxicity, in the mail from September 2026.

The answer key is in your files. For each job you reported there is the signed report, the EDD or DMR worksheet that went out, and often a checker's error list or a client's correction request. Those are what your reviewer scores the drafts against, row by row, before anything new is drafted.

One limit covers every job. The proof of concept works only on copies. It never reports, qualifies or changes a result, never decides whether a sample or a permit limit passes, never signs or submits a report, an EDD or a DMR, and never contacts your clients or any agency. Your qualified staff decide and sign, as they do now.