find_limits

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What is the limit for a substance in a place (an effluent, a river, drinking water, soil), as the regulation itself prints it? Numeric limits and guidelines for one substance or measure, read from the regulations themselves (US federal effluent guidelines, the rules of 31 states and DC, Canadian federal and all 13 provinces' and territories' rules, German, French, Italian and EU instruments), drinking-water standards (US 40 CFR 141 and 143, EU Directive 2020/2184, Quebec, PFAS in Germany, France, Italy and Canada) and soil and groundwater screening values (EPA RSLs, California ESLs, Ontario, Quebec, British Columbia, CCME, Italy, German and Italian PFAS). Each row gives value, unit, statistic, the conditions it applies under, and a `cite` block (instrument, edition, section or page, the quoted text, source URL and sha256). When nothing is held the answer is a `refused` block naming every instrument searched: say that our sources hold no such row, never that the law has no limit. For a US state, `permits_over` gives how many of its NPDES permits went over a limit on it in EPA's last 12 months, with the list_permits address that lists them.