{"meta":{"source":{"agency":"Mississippi State Department of Health","system":"SDWIS/STATE"},"limits":"Regulatory records as the agency reports them. AN EMPTY RESULT MEANS NOTHING MATCHED THIS RESPONSE'S SCOPE, NOT THAT THE AGENCY HAS NO RECORD: many collections are narrowed by the agency's own filters; each says so in its `scope` or `reading`. A record type this API does not serve is not evidence the records do not exist, and some of what the agency publishes is not served here. Read those before reporting any of these as an absence of fact.","coverage":"https://api.alpha.dww-next.mswater.us/coverage","apiVersion":"1.0.0","humanUrl":"https://alpha.dww-next.mswater.us/lead-and-copper"},"page":{"paginated":true,"total":612,"limit":50,"offset":20,"returned":50,"hasMore":true,"nextOffset":70,"prevOffset":0},"window":{"periodFrom":"2024-09-25","periodTo":"2026-09-25","source":"a default window, not your choice: the last two years. 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THE WINDOW ABOVE IS ON THE MONITORING PERIOD, not on a collection date — these records have no collection date, so the dates you can narrow this list by are periodFrom and periodTo. READ summaryType BEFORE READING measure. The agency records more than one kind of summary for a period and all of them are listed here, so one system and one substance can appear several times in one monitoring period with DIFFERENT numbers. Only summaryType.isNinetiethPercentile marks the 90th percentile — the figure the federal Lead and Copper Rule compares against an action level. The others are the agency's own codes and it publishes no decode for them, so none is invented here. Taking any measure in this response as a 90th percentile will overstate some systems. One system's own page shows ONLY the 90th percentile, because the agency's per-system query filters to it — so a number here can legitimately have no counterpart there. A SUMMARY IS NOT A SAMPLE RESULT. It is computed over the period; the individual lead and copper sample results are a different record. A value of zero is a recorded measurement, published as zero rather than as absent: it is the result at that rank, NOT a statement that nothing was detected in the period. 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