{
  "city": "Indianapolis",
  "state": "IN",
  "slug": "indianapolis",
  "hardness_facts": [
    {
      "utility": "Citizens Energy Group",
      "measure": "Hardness",
      "value_as_published": "Average 317 ppm (19 grains per gallon), range 148-460 ppm",
      "period": "Calendar year 2025",
      "source_title": "2025 Drinking Water Report (Citizens Energy Group, 2025 Water Quality Report)",
      "source_url": "https://info.citizensenergygroup.com/hubfs/site/water/2025%20Citizens%20Water%20Quality%20Report.pdf"
    }
  ],
  "published_span_mg_per_l": [
    148,
    460
  ],
  "span_converted_from_grains": false,
  "usgs_class": "hard to very hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "The same 2025 report also says hardness averages 320 mg/L in its text."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Citizens Energy Group adds chlorine and a small amount of ammonia, and lists chloramine as the additive that controls microbes.",
      "kind": "chloramine",
      "source_title": "Citizens Energy Group 2025 Water Quality Report",
      "source_url": "https://info.citizensenergygroup.com/hubfs/site/water/2025%20Citizens%20Water%20Quality%20Report.pdf",
      "evidence_ids": [
        "INDIAN-L-01"
      ]
    },
    "source_water": {
      "text": "Most Indianapolis water is surface water from the West Fork of the White River, Fall Creek and Eagle Creek Reservoir, with Morse and Geist reservoirs, plus groundwater from wells.",
      "source_title": "Citizens Energy Group 2025 Water Quality Report",
      "source_url": "https://info.citizensenergygroup.com/hubfs/site/water/2025%20Citizens%20Water%20Quality%20Report.pdf",
      "evidence_ids": [
        "INDIAN-L-02"
      ]
    },
    "by_area": {
      "text": "Citizens says hardness varies with the source water feeding each treatment plant, so it can differ by where you live.",
      "source_title": "Citizens Energy Group 2025 Water Quality Report",
      "source_url": "https://info.citizensenergygroup.com/hubfs/site/water/2025%20Citizens%20Water%20Quality%20Report.pdf",
      "evidence_ids": [
        "INDIAN-L-03"
      ]
    }
  },
  "sources_checked_on": "2026-10-27",
  "site": "https://indianapoliswatersystems.com/",
  "brand": "Indianapolis Water Systems by My Home Water System",
  "taking_requests": true
}