{
  "city": "Denver",
  "state": "CO",
  "slug": "denver",
  "hardness_facts": [
    {
      "utility": "Denver Water",
      "measure": "Total hardness",
      "value_as_published": "Average 105,009 ppb, range 55,000-124,000 ppb",
      "period": "Calendar year 2025",
      "source_title": "2026 Water Quality Report",
      "source_url": "https://www.denverwater.org/sites/default/files/water-quality-report-2026.pdf"
    },
    {
      "utility": "Denver Water",
      "measure": "Hardness, as Denver Water describes it",
      "value_as_published": "\"Soft to moderately hard\"",
      "period": "Undated web page",
      "source_title": "Denver Water: Water Hardness",
      "source_url": "https://www.denverwater.org/your-water/water-quality/water-hardness"
    }
  ],
  "published_span_mg_per_l": [
    55,
    124
  ],
  "span_converted_from_grains": false,
  "usgs_class": "soft to hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "Denver Water publishes hardness in parts per billion. 1,000 ppb equals 1 ppm, so its 2025 range is 55 to 124 ppm. Its own description, soft to moderately hard, is milder than the USGS class for the top of that range."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Denver Water adds chloramine after filtration to keep the water disinfected.",
      "kind": "chloramine",
      "source_title": "Denver Water treated water quality summary",
      "source_url": "https://www.denverwater.org/your-water/water-quality/treated-water-quality-summary",
      "evidence_ids": [
        "DENVER-L-01"
      ]
    },
    "source_water": {
      "text": "Denver Water draws on rivers, streams, reservoirs and springs fed by mountain snowmelt, gathered through a north and a south collection system.",
      "source_title": "Denver Water 2026 Water Quality Report",
      "source_url": "https://www.denverwater.org/sites/default/files/water-quality-report-2026.pdf",
      "evidence_ids": [
        "DENVER-L-02"
      ]
    },
    "seasonal": {
      "text": "Denver Water says its water is slightly harder in winter, when waterways and reservoirs freeze, and softer from late spring through fall, when runoff dilutes the minerals.",
      "source_title": "Denver Water water hardness page",
      "source_url": "https://www.denverwater.org/your-water/water-quality/water-hardness",
      "evidence_ids": [
        "DENVER-L-03"
      ]
    }
  },
  "sources_checked_on": "2026-10-27",
  "site": "https://denverwatersystems.com/",
  "brand": "Denver Water Systems by My Home Water System",
  "taking_requests": false
}