{
  "city": "Tucson",
  "state": "AZ",
  "slug": "tucson",
  "hardness_facts": [
    {
      "utility": "Tucson Water",
      "measure": "Hardness, as Tucson Water describes it",
      "value_as_published": "\"Hard to very hard\" (no number given)",
      "period": "Undated document",
      "source_title": "Tucson Water: Water Quality Parameter Explanation",
      "source_url": "https://www.tucsonaz.gov/files/sharedassets/public/v/1/city-services/tucson-water/water-quality/parameter-explanation-table.pdf"
    }
  ],
  "published_span_mg_per_l": null,
  "span_converted_from_grains": false,
  "usgs_class": null,
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "Tucson Water shows hardness by address on an interactive map that we could not read, and its 2023 and 2025 reports list hardness as monitored without a value."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Tucson Water keeps a chlorine residual of 0.80 to 1.2 mg/L through its pipes.",
      "kind": "chlorine",
      "source_title": "Tucson Water 2025 Consumer Confidence Report",
      "source_url": "https://www.tucsonaz.gov/files/sharedassets/public/v/1/city-services/tucson-water/water-quality/report-archive/ccr_mainsystem_2025.pdf",
      "evidence_ids": [
        "TUCSON-L-01"
      ]
    },
    "source_water": {
      "text": "Most Tucson water is Colorado River water delivered by the Central Arizona Project, soaked into the ground in Avra Valley and at Pima Mine Road and pumped back out, plus groundwater from the Central Well Field.",
      "source_title": "Tucson Water 2025 Consumer Confidence Report",
      "source_url": "https://www.tucsonaz.gov/files/sharedassets/public/v/1/city-services/tucson-water/water-quality/report-archive/ccr_mainsystem_2025.pdf",
      "evidence_ids": [
        "TUCSON-L-02"
      ]
    },
    "seasonal": {
      "text": "Tucson Water says hardness rises as the share of Central Arizona Project water rises.",
      "source_title": "Tucson Water hard water page",
      "source_url": "https://www.tucsonaz.gov/Departments/Water/Water-Quality/Aesthetics/Hard-Water",
      "evidence_ids": [
        "TUCSON-L-03"
      ]
    }
  },
  "sources_checked_on": "2026-10-27",
  "site": "https://tucsonwatersystems.com/",
  "brand": "Tucson Water Systems by My Home Water System",
  "taking_requests": false
}