{"meta":{"dataset_version":"2.1","status":"PRODUCTION. 2024 backbone + 2025 location-annexure layer (union flags, year-tagged).","source":"CGWB Annual Ground Water Quality Report 2024 (NHS 2023-24) + 2025 location annexures (Pre-Monsoon 2024)","source_url":"https://cgwb.gov.in/en/annual-ground-water-quality-report-2024","thresholds":{"salinity":"EC > 3000 µS/cm","fluoride":"F > 1.5 mg/L","nitrate":"NO₃ > 45 mg/L","iron":"Fe > 1.0 mg/L","arsenic":"As > 0.01 mg/L (10 ppb)","uranium":"U > 30 ppb","manganese":"Mn > 0.3 mg/L","lead":"Pb > 0.01 mg/L","zinc":"Zn > 15 mg/L"},"thresholds_note":"A flag means CGWB lists at least one monitored location in the district above that threshold. These are the report's own thresholds; for fluoride and iron they are the BIS permissible/relaxed limits, not the stricter acceptable limits.","known_source_discrepancies":["Iron Table 20: Uttar Pradesh row states 69 districts but lists 64 names; verified against rendered page 80. We carry the 64 listed names."],"extracted":"2026-06-12","pending":"Location-level annexure PDF (17355632661671451888file.pdf) for per-district EC/TDS ranges.","measured_note":"Location-level measured ranges from CGWB 2024 Annexures I-VII (only threshold-exceeding sites are listed, so ranges reflect affected sites). TDS estimated as 0.64xEC.","aliases":{"allahabad":"uttar-pradesh/prayagraj","allahabad/ prayagraj":"uttar-pradesh/prayagraj","faizabad":"uttar-pradesh/ayodhya","faizabad/ ayodhya":"uttar-pradesh/ayodhya","mysuru":"karnataka/mysore","ballari":"karnataka/bellary","belagavi":"karnataka/belgaum","kalaburagi":"karnataka/gulbarga","tumakuru":"karnataka/tumkur","vijayapura":"karnataka/bijapur"},"audit":"Cross-verified against CGWB 2024 district anomaly tables (Tables 6,11,18,20,21,24) and location-level Annexure. Flags sourced from district tables; measured ranges from location annexure. 9 renamed-district duplicates merged (Allahabad/Prayagraj, Faizabad/Ayodhya, 6 Karnataka old/new name pairs).","merge_note":"Flags are union of 2024 and 2025 location-annexure exceedances. Per-year detail in .years. Summary-table-only districts (1.pdf) NOT flagged: no location-level measured value published.","contaminants":["salinity","fluoride","nitrate","iron","arsenic","uranium","manganese","lead","zinc"],"dedup":{"method":"normalised name collision review, manual confirmation; abbreviation expansion pass (E./East, W/West); transliteration pass (Th/T, abbreviations, Pondicherry/Puducherry)","entries_merged":61,"canonical_count":755,"aliases_added":["Anugul","Arvalli","Bagalkot","Baleshwar","Bametara","Bulandshahar","Chhota Udaipur","Chikballapur","Chittaurgarh","Devbhoomi Dwarka","Dhaulpur","Dungaarpur","Gomti","Jajapur","Karimganj","Kasarakode","Kutch","Loherdaga","Mahesana","Mumbai","Nasik","Nilgiri","North & Middle Andaman","Pathanamthita","Pedapalle","Shimoga","Shivmoga","Sibsagar","Sindudurg","Sirmour","Sonapur","South West Garo Hill","Sribhumi","Trivandrum","Villupuram","Wasim","West Garo Hill"],"date":"2026-08-09"},"tiering":{"method":"spec section 7: top 110 districts by largest Census 2011 Class I city population, plus state and UT capitals, plus any district with a reading over 10x its BIS limit on a health-relevant contaminant (arsenic, lead, fluoride, uranium, nitrate); guide cap ~190, population picks never dropped","source":"Census of India 2011, Table A-04 Class I towns (population 100,000 and above), Office of the Registrar General & Census Commissioner, India. 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