{
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 "description": "Append-only Evidence Passport records. Old revisions are immutable; corrections create a new revision and preserve the previous permalink.",
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  "id": "rome-acea-smart-water",
  "title": "Rome Smart Water Network (Acea Ato 2)",
  "canonicalUrl": "https://1001smartcities.org/projects/rome-acea-smart-water/"
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 "currentRevisionId": "2026-08-27-source-dating",
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   "id": "2026-08-27-claims-and-sources",
   "createdAt": "2026-08-27T05:08:04Z",
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     "path": "/evidencePassport",
     "summary": "Added claim-level evidence mapping and source dossiers."
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    {
     "operation": "add",
     "path": "/revisionHistory",
     "summary": "Established a permanent, hash-addressed baseline revision."
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    },
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     {
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      "text": "759 measurement districts over more than 13,000km of georeferenced network",
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      "supportNote": "Stated in the sustainability report's water-leaks chapter.",
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     {
      "id": "clm-ab9ae4e538f65ebb",
      "field": "snippet",
      "text": "with surveys, flow and pressure measurement, water balancing, mathematical modelling and active leak searching on top",
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      "text": "A second programme is swapping household meters for electronic ones that send consumption data to the utility by themselves; the swap is free to the customer",
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      "text": "Total leaks on the Rome network eased to 27.8% in 2023, from 27.9% in 2022",
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      "text": "Counted as volume rather than share, the same year's measures cut the water lost by 2% against 2022 and by about 19% against 2019",
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      "text": "Across the whole territory the utility serves, total leaks were still around 38.4%, down from 38.9% in 2022",
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      "supportNote": "Both the share and the volume figures appear in Acea's own sustainability report; no external verification is cited alongside them.",
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      "field": "lesson",
      "text": "changing the meter is a legal obligation under a ministerial decree of 21 April 2017 covering every non-MID meter installed before 2007",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
      "id": "clm-414ad9afa57b0aea",
      "field": "lesson",
      "text": "the meter reports consumption to Acea Ato 2 on its own, which is what turns a legally required swap into bills based on real use and leaks that show up early",
      "statementKind": "quantitative",
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      "supportNote": "The operator names exactly these three effects of the communication module.",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     {
      "id": "src-7a802650d1de34b2",
      "title": "Acea 2023 Sustainability Report — water leaks (operator)",
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       "value": "Operator/authority. 759 measurement districts over 13,000+ km, 529 flow/pressure meters (2023); Rome network leaks 27.8% (2023) vs 27.9% (2022); territory total ~38.4%; ~19% loss reduction vs 2019.",
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      },
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     },
     {
      "id": "src-1c95030859e1b004",
      "title": "Acea Ato 2 — electronic water-meter replacement plan (operator)",
      "url": "https://www.aceaato2.a-acqua.it/piano-sostituzione-contatori",
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       "domain": "aceaato2.a-acqua.it",
       "classification": "not-classified"
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       "value": "The meter replacement plan: modern digital meters, free of charge to the customer; smart meters that transmit consumption data directly to Acea Ato 2, giving bills based on real use and early detection of leaks; the replacement is a legal obligation under ministerial decree no. 93 of 21 April 2017 for all non-MID meters installed before 2007.",
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      "title": "Acea Ato 2 — who we are (operator)",
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       "value": "Acea Ato 2 as operator of the integrated water service in ATO 2 Lazio Centrale-Roma, the largest in Italy: about four million people served over more than 5,000 square kilometres, the capital and 112 municipalities of Lazio.",
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      },
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    "limits": [
     "Publisher names and source languages have not yet been classified; domains are recorded without guessing.",
     "Existing source notes are descriptive locators, not page- or paragraph-exact citations.",
     "A missing archive, publication date or content hash is shown as null rather than inferred.",
     "The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim."
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   }
  },
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   "id": "2026-08-27-source-dating",
   "createdAt": "2026-08-27T13:37:00Z",
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     {
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      "field": "impact",
      "text": "Across the whole territory the utility serves, total leaks were still around 38.4%, down from 38.9% in 2022",
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      "field": "lesson",
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     {
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      "text": "changing the meter is a legal obligation under a ministerial decree of 21 April 2017 covering every non-MID meter installed before 2007",
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       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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     },
     {
      "id": "clm-414ad9afa57b0aea",
      "field": "lesson",
      "text": "the meter reports consumption to Acea Ato 2 on its own, which is what turns a legally required swap into bills based on real use and leaks that show up early",
      "statementKind": "quantitative",
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     {
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      "title": "Acea 2023 Sustainability Report — water leaks (operator)",
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       "value": "Operator/authority. 759 measurement districts over 13,000+ km, 529 flow/pressure meters (2023); Rome network leaks 27.8% (2023) vs 27.9% (2022); territory total ~38.4%; ~19% loss reduction vs 2019. The page states no publication date.",
       "exact": false
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       "value": "The meter replacement plan: modern digital meters, free of charge to the customer; smart meters that transmit consumption data directly to Acea Ato 2, giving bills based on real use and early detection of leaks; the replacement is a legal obligation under ministerial decree no. 93 of 21 April 2017 for all non-MID meters installed before 2007.",
       "exact": false
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       "value": "Acea Ato 2 as operator of the integrated water service in ATO 2 Lazio Centrale-Roma, the largest in Italy: about four million people served over more than 5,000 square kilometres, the capital and 112 municipalities of Lazio.",
       "exact": false
      },
      "preservation": {
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    ],
    "coverage": {
     "claimsTotal": 10,
     "claimsMapped": 10,
     "sourcesTotal": 3,
     "sourcesUsedByClaims": 3,
     "sourcesWithPublicationDate": 0,
     "sourcesWithArchive": 0,
     "sourcesWithExactLocator": 0,
     "sourcesWithContentHash": 0
    },
    "limits": [
     "Publisher names and source languages have not yet been classified; domains are recorded without guessing.",
     "Existing source notes are descriptive locators, not page- or paragraph-exact citations.",
     "A missing archive, publication date or content hash is shown as null rather than inferred.",
     "The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim."
    ]
   }
  }
 ]
}