{"query":{"parameter":"hydrogen sulfide","place":"US-NH","medium":null,"statistic":null,"kind":null},"searched":{"places":["US-NH","US"],"parameter_keys":["cas:7783-06-4","cas:115408-95-2","name:undisassociated hydrogen sulfide","cas:3547-33-9","cas:538-74-9","cas:97-74-5","cas:463-58-1","cas:592-88-1","cas:544-40-1","cas:352-93-2","cas:75-18-3","cas:111-47-7","cas:3698-89-3","cas:2469-45-6","cas:3698-94-0","cas:420-12-2","cas:6294-31-1","cas:625-80-9","cas:2690-08-6","cas:7446-34-6","cas:18496-25-8","name:sulfide, easily liberated","name:sulfides, total","name:hydrogen sulphide","name:sulfure d’hydrogene"],"names_matched":[["hydrogen sulfide","cas:7783-06-4"],["cyclohexene 4 ethenyl reaction products with hydrogen sulfide h2s","cas:115408-95-2"],["undisassociated hydrogen sulfide","name:undisassociated hydrogen sulfide"],["2 hydroxyethyl octyl sulfide","cas:3547-33-9","sulfide"],["benzyl sulfide","cas:538-74-9","sulfide"],["bis dimethylthiocarbamoyl sulfide","cas:97-74-5","sulfide"],["carbonyl sulfide","cas:463-58-1","sulfide"],["diallyl sulfide","cas:592-88-1","sulfide"],["dibenzyl sulfide","cas:538-74-9","sulfide"],["dibutyl sulfide","cas:544-40-1","sulfide"],["diethyl sulfide","cas:352-93-2","sulfide"],["dimethyl sulfide","cas:75-18-3","sulfide"],["dipropyl sulfide","cas:111-47-7","sulfide"],["dodecyl methyl sulfide","cas:3698-89-3","sulfide"],["dodecyl sulfide","cas:2469-45-6","sulfide"],["ethyl n octyl sulfide","cas:3698-94-0","sulfide"],["ethylene sulfide","cas:420-12-2","sulfide"],["hexyl sulfide","cas:6294-31-1","sulfide"],["isopropyl sulfide","cas:625-80-9","sulfide"],["octyl sulfide","cas:2690-08-6","sulfide"],["selenium sulfide","cas:7446-34-6","sulfide"],["sulfide","cas:18496-25-8","sulfide"],["sulfide easily liberated","name:sulfide, easily liberated","sulfide"],["diallyl sulfides","cas:592-88-1","sulfides"],["sulfides total","name:sulfides, total","sulfides"],["hydrogen sulphide","name:hydrogen sulphide","hydrogen sulphide"],["sulfure d hydrogene","name:sulfure d’hydrogene","sulfure d hydrogene"],["sulfure d hydrogene h2s","name:sulfure d’hydrogene","sulfure d hydrogene"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order","not_sent":{"rows":12,"names":["Carbonyl Sulfide","Dimethyl Sulfide","Selenium Sulfide","Sulfide"],"says":"12 rows share a parameter key with a longer name holding \"hydrogen sulfide\" but are printed under names without these words (that key is wider than the name), or keyed to a CAS number \"hydrogen sulfide\" does not name (another substance, whatever words its name holds): not sent. Ask for one by its name or CAS number."}},"total":101,"offset":0,"returned":50,"next_offset":50,"rows":[{"id":"23a0e9cc8c9d42ad","parameter":"Sulfide-Hydrogen Sulfide","value":"2.0","value_num":2,"unit":"µg/L","direction":"max","kind":"guideline","medium":"surface_water","level":"regional","parameter_key":"cas:7783-06-4","place":["US-NH"],"conditions":["receiving_water is freshwater"],"cite":{"instrument":"us_nh_wqs","title":"New Hampshire Env-Wq 1700 Surface Water Quality Regulations: Table 1703-1 water quality criteria for toxic substances (fresh and marine acute/chronic aquatic life; human health), and class dissolved oxygen and pH","issuer":"State of New Hampshire, Department of Environmental Services","edition":"Env-Wq 1700 effective December 13, 2022 as US EPA posts it in effect for CWA purposes (cover page April 6, 2023), with the human health columns from the February 13, 2015 rule EPA also posts (its 2022 revisions still under EPA review); the state re-adopted Env-Wq 1700 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(BAT)"],"cite":{"instrument":"us_40cfr410","title":"40 CFR Part 410 — PART 410—TEXTILE MILLS POINT SOURCE CATEGORY","issuer":"U.S. Environmental Protection Agency","edition":"eCFR as of 2026-10-05","source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-10-05/title-40.xml?part=410","source_sha256":"02c53988595c9f2911727f635f59f6a2af0c1d50ce06550c150a706321a505b3","fetched_at":"2026-10-09","source_status":{"checked":"2026-10-15","status":"unchanged"},"section":"40 CFR 410.13 (BAT)","page":null,"quote":"Sulfide 0.20 0.10"}},{"id":"90538b1a4ecf0c65","parameter":"Sulfide","value":"0.20","value_num":0.2,"unit":"Kg/kkg (or pounds per 1,000 lb) of wool","statistic":"daily_max","direction":"max","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"cas:7783-06-4","place":["US"],"conditions":["route is direct","cites is 40 CFR 410","the discharge is of the Subpart A—Wool Scouring Subcategory","new sources (NSPS)","Any new source subject to this 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