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That exclusion is the agency's own and it applies to every all-systems collection here; some of the systems it removes are active, so a count taken here is not a count of the agency's sampling. Only samples whose laboratory record is active and of type AC are listed — legacy's own join; the code is the agency's, published without a decode. ONE ROW IS A SAMPLE, NOT A RESULT — samples are listed here and prints no analyte, value or unit on them, so neither does this. For the numbers, follow system.records to that system's own /v1/water-systems/{pwsid}/samples, which carries every result inline under its sample. Its total counts SAMPLES, as this one does — not results, of which each sample has several. MICROBIOLOGICAL analytes are excluded from the unfiltered list by the agency's own query, which excludes every analyte typed as an organism — THOSE SAMPLES ARE NOT MISSING, THEY ARE AT /v1/coliform-samples, which is the other half of the same partition and is the larger half in this installation. Read both before concluding anything about how much the agency samples. THE ANALYTE FILTER IS A DIFFERENT DOOR: asking for a specific analyte drops that exclusion and replaces it with three NAMED codes — 3100 COLIFORM (TCR), 3013 FECAL COLIFORM and 3014 E. COLI. So ?analyte= PERMITS an organism the unfiltered list never shows, wherever such a sample falls inside the window you asked for, and asking for one of those three codes is empty either way. THIS IS A DIFFERENCE BETWEEN TWO QUERIES, NOT A FEATURE ANYONE DOCUMENTED. The agency reaches this filter only through its analyte list, which excludes organisms — so there the wider door is never opened, and this is the difference showing rather than a capability being offered. Whether any organism is reachable depends on the installation and on your window. An empty page under ?analyte= means no matching sample in that window; read filters and window above before reading it as absence. detectedOnly is the agency's own toggle and means a recorded concentration above zero; it is NOT the less-than indicator that decides whether a number counts as a detection on a single system's results. detectedOnly — On or off: send it bare, empty, or =true to turn it on, and =false or leave it out to turn it off. 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