{
  "city": "Mesa",
  "state": "AZ",
  "slug": "mesa",
  "hardness_facts": [
    {
      "utility": "City of Mesa",
      "measure": "Average hardness, City Zone",
      "value_as_published": "About 12 grains per gallon",
      "period": "Calendar year 2025",
      "source_title": "Mesa 2025 Water Quality Consumer Confidence Report",
      "source_url": "https://www.mesaaz.gov/files/content/public/v/16/utilities/water-wastewater/water-quality/english-water-quality-report-2025.pdf"
    },
    {
      "utility": "City of Mesa",
      "measure": "Average hardness, Eastern and Southern Zones",
      "value_as_published": "16 grains per gallon",
      "period": "Calendar year 2025",
      "source_title": "Mesa 2025 Water Quality Consumer Confidence Report",
      "source_url": "https://www.mesaaz.gov/files/content/public/v/16/utilities/water-wastewater/water-quality/english-water-quality-report-2025.pdf"
    }
  ],
  "published_span_mg_per_l": [
    205,
    274
  ],
  "span_converted_from_grains": true,
  "usgs_class": "very hard",
  "usgs_class_source": "https://www.usgs.gov/water-science-school/science/hardness-water",
  "notes": [
    "The City Zone gets Salt River Project water from the Salt and Verde Rivers. The Eastern and Southern Zones get Central Arizona Project water from the Colorado River. Groundwater wells supply all zones.",
    "Mesa's undated water quality concerns page gives a wider range of 12 to 22 grains per gallon depending on the source serving the area."
  ],
  "local_details": {
    "disinfectant": {
      "text": "Mesa disinfects with chlorine dioxide and chlorine before water enters its pipes.",
      "kind": "chlorine",
      "source_title": "Mesa 2025 Water Quality Consumer Confidence Report",
      "source_url": "https://www.mesaaz.gov/files/content/public/v/16/utilities/water-wastewater/water-quality/english-water-quality-report-2025.pdf",
      "evidence_ids": [
        "MESA-L-01"
      ]
    },
    "seasonal": {
      "text": "Mesa says every zone may get groundwater or a blend of surface water and groundwater at different times of the year, and some customers get only well water at times.",
      "source_title": "Mesa 2025 Water Quality Consumer Confidence Report",
      "source_url": "https://www.mesaaz.gov/files/content/public/v/16/utilities/water-wastewater/water-quality/english-water-quality-report-2025.pdf",
      "evidence_ids": [
        "MESA-L-02"
      ]
    }
  },
  "sources_checked_on": "2026-10-26",
  "site": "https://mesawatersystems.com/",
  "brand": "Mesa Water Systems by My Home Water System",
  "taking_requests": true
}