{
  "city": "Cincinnati",
  "state": "OH",
  "slug": "cincinnati",
  "hardness_facts": [
    {
      "utility": "Greater Cincinnati Water Works",
      "measure": "Average hardness, Miller Plant",
      "value_as_published": "Average 126 mg/L (7 grains per gallon)",
      "period": "Undated FAQ on the page for the 2025 report",
      "source_title": "Water Quality Reports (GCWW), Frequently Asked Questions: How hard is GCWW's water?",
      "source_url": "https://www.cincinnati-oh.gov/water/water-quality-and-treatment/water-quality-reports/"
    },
    {
      "utility": "Greater Cincinnati Water Works",
      "measure": "Average hardness, Bolton Plant",
      "value_as_published": "Average 140 mg/L (8 grains per gallon)",
      "period": "Undated FAQ on the page for the 2025 report",
      "source_title": "Water Quality Reports (GCWW), Frequently Asked Questions: How hard is GCWW's water?",
      "source_url": "https://www.cincinnati-oh.gov/water/water-quality-and-treatment/water-quality-reports/"
    }
  ],
  "published_span_mg_per_l": [
    126,
    140
  ],
  "span_converted_from_grains": false,
  "usgs_class": "hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "Greater Cincinnati Water Works treats with ultraviolet light and chlorine.",
    "The utility does not say which plant serves which part of the city."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Greater Cincinnati Water Works treats with ultraviolet light and chlorine.",
      "kind": "chlorine",
      "source_title": "Greater Cincinnati Water Works water quality reports page",
      "source_url": "https://www.cincinnati-oh.gov/water/water-quality-and-treatment/water-quality-reports/",
      "evidence_ids": [
        "CINCIN-L-01"
      ]
    },
    "source_water": {
      "text": "About 88 percent of Cincinnati water is Ohio River water from the Miller plant, and the rest is groundwater from the Great Miami Buried Valley Aquifer.",
      "source_title": "Greater Cincinnati Water Works water quality reports page",
      "source_url": "https://www.cincinnati-oh.gov/water/water-quality-and-treatment/water-quality-reports/",
      "evidence_ids": [
        "CINCIN-L-02"
      ]
    }
  },
  "sources_checked_on": "2026-10-27",
  "site": "https://cincinnatiwatersystems.com/",
  "brand": "Cincinnati Water Systems by My Home Water System",
  "taking_requests": false
}