{
  "city": "Henderson",
  "state": "NV",
  "slug": "henderson",
  "hardness_facts": [
    {
      "utility": "City of Henderson",
      "measure": "Hardness",
      "value_as_published": "Typically 304 parts per million (18 grains per gallon)",
      "period": "2026 report (2025 data)",
      "source_title": "City of Henderson Water Quality Report",
      "source_url": "https://www.cityofhenderson.com/government/departments/utility-services/water-quality/water-quality-report"
    }
  ],
  "published_span_mg_per_l": [
    304,
    304
  ],
  "span_converted_from_grains": false,
  "usgs_class": "very hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "The city describes its water as very hard and suggests setting a softener between 16 and 19 grains per gallon.",
    "Henderson's 2025 free chlorine residual averaged 0.82 ppm."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Henderson lists a free chlorine residual in its water report.",
      "kind": "chlorine",
      "source_title": "Henderson 2026 Water Quality Report",
      "source_url": "https://www.cityofhenderson.com/home/showpublisheddocument/18097/639154026931400000",
      "evidence_ids": [
        "HENDER-L-01"
      ]
    },
    "source_water": {
      "text": "All Henderson water comes from the Colorado River at Lake Mead, treated by the Southern Nevada Water Authority.",
      "source_title": "City of Henderson water source document",
      "source_url": "https://www.cityofhenderson.com/home/showpublisheddocument/18284/639184439008070000",
      "evidence_ids": [
        "HENDER-L-02"
      ]
    }
  },
  "sources_checked_on": "2026-10-26",
  "site": "https://hendersonwatersystems.com/",
  "brand": "Henderson Water Systems by My Home Water System",
  "taking_requests": true
}